CN109949748B - Display data compensation method, display data compensation device and display device - Google Patents
Display data compensation method, display data compensation device and display device Download PDFInfo
- Publication number
- CN109949748B CN109949748B CN201910323765.1A CN201910323765A CN109949748B CN 109949748 B CN109949748 B CN 109949748B CN 201910323765 A CN201910323765 A CN 201910323765A CN 109949748 B CN109949748 B CN 109949748B
- Authority
- CN
- China
- Prior art keywords
- compensation
- mobility
- variation
- threshold voltage
- data
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention provides a display data compensation method, a display data compensation device and a display device, wherein the method comprises the following steps: in the frame idle stage, test display data is input to the sub-pixels; acquiring actual sensing data sensed from the sub-pixels after a preset charging time; determining the temperature change value of the sub-pixel according to the test display data, the actual sensing data and the pre-stored compensation reference data; calculating a threshold voltage compensation value and a mobility compensation value according to the temperature change value of the sub-pixel and the pre-stored variation of the threshold voltage and the mobility of the driving transistor of the sub-pixel along with the temperature; and in the frame display stage, compensating the display data to be output to the sub-pixels according to the threshold voltage compensation value and the mobility compensation value. In the invention, when the display device actually displays, the influence of temperature change on the mobility and the threshold voltage is considered to obtain a relatively accurate mobility compensation value and a relatively accurate threshold voltage compensation value, so that the picture display quality of the display device is improved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display data compensation method, a display data compensation device, and a display apparatus.
Background
OLED (organic light emitting diode) display devices are widely accepted due to their excellent functions, such as wide color gamut, wide viewing angle, thinness, lightness, low power consumption, high contrast, and flexibility, and are gradually becoming the development direction of future display technologies. However, in the field of large-sized OLED display devices, instability of TFT (thin film transistor) characteristics is the greatest disadvantage due to its oxide process, and the instability of TFTs causes a reduction in picture quality.
Since the OLED display device is a display mode in which the current and thus the luminance are controlled by the voltage, the luminance is not only related to the display voltage but also related to the mobility (K) and the threshold voltage (Vth) of the driving transistor.
Current I flowing through the drive transistorOLEDCan be represented by the following formula:
where K is carrier mobility (may be referred to as mobility), Cox is gate oxide capacitance, W/L is width-to-length ratio of the driving transistor, Vgs is gate-to-source voltage of the driving transistor, and Vth is threshold voltage of the driving transistor.
From the above formula, the mobility and threshold voltage pair I can be seenOLEDThe effect of (a) is very large. In the light emitting process of the OLED display panel, the mobility and the threshold voltage of the driving transistor may shift, thereby seriously degrading the picture quality, and thus, the mobility and the threshold voltage of the driving transistor need to be compensated.
In a conventional external compensation mode, in a test stage, mobility and threshold voltage of a driving transistor are calculated through a shutdown compensation mode, and then the mobility and the threshold voltage are compensated in an actual display stage. Since various conditions of the shutdown compensation and the actual display stage are different, it is difficult to obtain accurate mobility and threshold voltage in the shutdown compensation, and an afterimage or Mura (uneven brightness) occurs in the low brightness.
Disclosure of Invention
In view of the above, the present invention provides a display data compensation method, a display data compensation device and a display apparatus, which are used to solve the problem that the conventional external compensation method is difficult to obtain accurate mobility and threshold voltage, so that an afterimage or Mura occurs under a low luminance condition.
In order to solve the above technical problem, the present invention provides a display data compensation method applied to a display device, the display device including a plurality of sub-pixels, each of the sub-pixels including a light emitting device and a driving transistor, the method including:
inputting test display data to the sub-pixels in a frame idle stage of the display device;
acquiring actual sensing data sensed from the sub-pixels after a preset charging time period;
determining the temperature change value of the sub-pixel according to the test display data, the actual sensing data and pre-stored compensation reference data;
calculating a threshold voltage compensation value and a mobility compensation value according to the temperature change value of the sub-pixel, and the pre-stored variation of the threshold voltage of the driving transistor of the sub-pixel along with the temperature and the variation of the mobility along with the temperature;
and in a frame display stage of the display device, compensating the display data to be output to the sub-pixels according to the threshold voltage compensation value and the mobility compensation value.
Optionally, the pre-stored compensation reference data includes:
reference sensing data obtained during a testing phase; and
reference mobility obtained during the test phase.
Optionally, the temperature change value is calculated by using the following formula:
where Δ N is the temperature variation value, K1 is the reference mobility, L is gray data input when a reference threshold voltage is obtained in a test phase, V1 is the reference sensing data, V2 is the actual sensing data, t1 is a pre-stored variation with temperature of the threshold voltage of the driving transistor of the sub-pixel, and t2 is a pre-stored variation with temperature of the mobility of the driving transistor of the sub-pixel.
Optionally, in the test stage, a compensation test of the threshold voltage and the transition value is performed in a shutdown compensation manner at a specified temperature.
Optionally, the reference sensing data is obtained by:
sensing a reference threshold voltage Vth1 in a test phase, wherein when the reference threshold voltage is sensed, a display voltage input to the sub-pixel is Data;
inputting Data + Vth1 to the sub-pixel to obtain a reference mobility K1;
data1 is input to the sub-pixels, where,
and acquires reference sensing data V1 sensed from the sub-pixels after the preset charging period has elapsed,wherein L is the gray scale Data corresponding to the Data.
Optionally, the calculating a threshold voltage compensation value and a mobility compensation value according to the temperature variation value and a pre-stored variation of the threshold voltage of the driving transistor of the sub-pixel with temperature and a variation of the mobility with temperature includes:
obtaining compensation variation of the threshold voltage and compensation variation of the mobility according to the temperature variation value and pre-stored variation of the threshold voltage of the driving transistor of the sub-pixel along with the temperature and variation of the mobility along with the temperature;
and obtaining a threshold voltage compensation value and a mobility compensation value according to the compensation variation of the threshold voltage and the compensation variation of the mobility.
Optionally, the compensation variation of the threshold voltage is calculated by the following formula: Δ Vth is Δ N × t1, where Δ Vth is a compensation variation of the threshold voltage, Δ N is the temperature variation value, and t1 is a variation of the threshold voltage of the driving transistor of the subpixel with temperature;
the compensation variation amount of the mobility is calculated by the following formula: Δ K is Δ N × t2, Δ K is the compensation variation of the mobility, Δ N is the temperature variation value, and t2 is the variation of the mobility of the driving transistor of the subpixel with temperature.
Optionally, the obtaining a threshold voltage compensation value and a mobility compensation value according to the compensation variation of the threshold voltage and the compensation variation of the mobility includes:
the threshold voltage compensation value and the mobility compensation value are obtained by searching a threshold voltage compensation table including a threshold voltage compensation value Vth obtained from a reference threshold voltage Vth1 and a variation of different threshold voltages and a mobility compensation table including a mobility compensation value K obtained from a reference mobility K1 and a variation of different mobilities.
Optionally, the compensated data voltage is calculated by using the following formula:
data 'is the compensated Data voltage, K is the mobility compensation value, Vth is the threshold voltage compensation value, and L' is the received gray scale Data.
The present invention also provides a display data compensation device applied to a display apparatus including a plurality of sub-pixels each including a light emitting device and a driving transistor, the display data compensation device including:
a data output unit for inputting test display data to the sub-pixels in a frame idle stage of the display device;
a sensing data acquisition unit for acquiring actual sensing data sensed from the sub-pixels after a preset charging time period;
the temperature change value calculation unit is used for determining the temperature change value of the sub-pixel according to the test display data, the actual sensing data and pre-stored compensation reference data;
the compensation value calculating unit is used for calculating a threshold voltage compensation value and a mobility compensation value according to the temperature change value of the sub-pixel, and the pre-stored variation of the threshold voltage of the driving transistor of the sub-pixel along with the temperature and the variation of the mobility along with the temperature;
and the data output unit is further configured to compensate, in a frame display stage of the display device, display data to be output to the sub-pixels according to the threshold voltage compensation value and the mobility compensation value.
Optionally, the pre-stored compensation reference data includes:
reference sensing data obtained during a testing phase; and
reference mobility obtained during the test phase.
Optionally, the temperature change value is calculated by using the following formula:
where Δ N is the temperature variation value, K1 is the reference mobility, L is gray data input when a reference threshold voltage is obtained in a test phase, V1 is the reference sensing data, V2 is the actual sensing data, t1 is a pre-stored variation with temperature of the threshold voltage of the driving transistor of the sub-pixel, and t2 is a pre-stored variation with temperature of the mobility of the driving transistor of the sub-pixel.
Optionally, the compensation value calculating unit is configured to obtain a compensation variation of the threshold voltage and a compensation variation of the mobility according to the temperature variation value and a pre-stored variation of the threshold voltage of the driving transistor of the sub-pixel with temperature and a variation of the mobility with temperature; and obtaining a threshold voltage compensation value and a mobility compensation value according to the compensation variation of the threshold voltage and the compensation variation of the mobility.
Optionally, the compensation variation of the threshold voltage is calculated by the following formula: Δ Vth is Δ N × t1, where Δ Vth is a compensation variation of the threshold voltage, Δ N is the temperature variation value, and t1 is a variation of the threshold voltage of the driving transistor of the subpixel with temperature;
the compensation variation amount of the mobility is calculated by the following formula: Δ K is Δ N × t2, Δ K is the compensation variation of the mobility, Δ N is the temperature variation value, and t2 is the variation of the mobility of the driving transistor of the subpixel with temperature.
Optionally, the compensation value calculating unit is configured to obtain a threshold voltage compensation value and a mobility compensation value by searching a threshold voltage compensation table and a mobility compensation table, where the threshold voltage compensation table includes a threshold voltage compensation value Vth obtained from a reference threshold voltage Vth1 and a variation of a different threshold voltage, and the mobility compensation table includes a mobility compensation value K obtained from a reference mobility K1 and a variation of a different mobility.
Optionally, the compensated data voltage is calculated by using the following formula:
data 'is the compensated Data voltage, K is the mobility compensation value, Vth is the threshold voltage compensation value, and L' is the received gray scale Data.
The invention also provides a display device comprising the display data compensation device.
The technical scheme of the invention has the following beneficial effects:
in the embodiment of the invention, in the actual display stage of the display device, the influence of temperature change on the mobility and the threshold voltage is considered to obtain the relatively accurate mobility compensation value and threshold voltage compensation value, so that the picture display quality of the display device is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a schematic circuit diagram of a sub-pixel according to some embodiments of the present invention;
FIG. 2 is a graph showing the mobility at different temperatures;
FIG. 3 is a graph showing the variation of threshold voltage at different temperatures;
FIG. 4 is a flowchart illustrating a method for compensating display data according to an embodiment of the invention;
FIG. 5 is a table illustrating the variation of threshold voltage with temperature and the variation of mobility with temperature according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an Id-Vg curve of a driving transistor according to an embodiment of the present invention;
FIG. 7 is a waveform diagram illustrating various parameters for sensing a reference threshold voltage according to an embodiment of the present invention;
FIG. 8 is a waveform diagram illustrating various parameters for sensing reference mobility according to an embodiment of the present invention;
FIG. 9 is a waveform diagram illustrating various parameters for sensing a reference sensing voltage according to an embodiment of the present invention;
FIG. 10 is a flowchart illustrating a method for compensating display data according to another embodiment of the present invention;
FIG. 11 is a schematic structural diagram of a display data compensation device according to an embodiment of the present invention;
FIG. 12 is a schematic structural diagram of a timing controller according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a display device according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
The display device in the embodiment of the present invention may be an OLED display device, and the OLED display device includes: referring to fig. 1, fig. 1 is a schematic circuit structure diagram of a sub-pixel in some embodiments of the present invention, in which the sub-pixel includes: a light emitting device OLED, a driving transistor T1, a switching transistor T2, a sensing transistor T3, and a storage capacitor Cst, wherein a control terminal of the driving transistor T1 is connected to a node G, a first pole is connected to ELVDD (anode voltage), and a second pole is connected to a node S; a control terminal of the switching transistor T2 is connected to the scan line GL1, a first pole thereof is connected to the data line DL, and a second pole thereof is connected to the node G; a control terminal of the sensing transistor T3 is connected to the scan line GL2, a first pole is connected to the node S, and a second pole is connected to the sensing line SL; the anode of the light emitting device OLED is connected to the node S, and the cathode is connected to ELVSS (cathode voltage). The storage capacitor Cst has a first electrode connected to the node G and a second electrode connected to the node S. Of course, fig. 1 shows the circuit structure of the sub-pixel in some embodiments of the present invention, and in other embodiments of the present invention, the circuit of the sub-pixel may be of other types.
In the process of emitting light of the OLED display panel, a data voltage is input to the sub-pixel through the data line DL, the driving transistor T1 is controlled to be turned on, and after the driving transistor T1 is turned on, the light emitting device OLED emits light, and a voltage at the node S of the sub-pixel may be sensed through the sensing line SL, so that the mobility and the threshold voltage of the driving transistor T1 of the sub-pixel are compensated according to the sensed sensing voltage.
Referring to fig. 2 and 3, fig. 2 and 3 are schematic graphs illustrating variation curves of the mobility and the threshold voltage at different temperatures, and it can be seen from the variation curves that the mobility and the threshold voltage of the driving transistor become smaller as the temperature (T) increases. However, in the conventional compensation method, the influence of temperature on the mobility and the threshold voltage is not considered, so that the inaccurate mobility compensation value and the inaccurate threshold voltage compensation value are used for compensation, which causes short-time afterimages on the OLED display panel and reduces the picture quality.
In order to solve the above problem, embodiments of the present invention provide a display data compensation method, a display data compensation device, and a display apparatus, in which, in an actual display stage of the display apparatus, an influence of a temperature change on a mobility and a threshold voltage is considered to obtain a relatively accurate mobility compensation value and a threshold voltage compensation value, so as to improve a picture display quality of the display apparatus.
Referring to fig. 4, an embodiment of the present invention provides a method for compensating display data, applied to a display device, where the display device includes a plurality of sub-pixels, each of the sub-pixels includes a light emitting device and a driving transistor, and the method includes:
step 11: inputting test display data to the sub-pixels during a frame idle (Blanking) phase of the display device;
the frame idle phase refers to a period of idle time between two frames. Because the frame idle time between two frames is less than the time of one frame, and the human eye time persistence is about 0.2S and is far more than the time of one frame, the test display data is input to the sub-pixels in the frame idle time, and the normal display is not influenced.
Step 12: acquiring actual sensing data sensed from the sub-pixels after a preset charging time period;
the actual sensing data is obtained by sensing through the sensing lines corresponding to the sub-pixels.
Step 13: determining the temperature change value of the sub-pixel according to the test display data, the actual sensing data and pre-stored compensation reference data;
step 14: calculating a threshold voltage compensation value and a mobility compensation value according to the temperature change value of the sub-pixel, and the pre-stored variation of the threshold voltage of the driving transistor of the sub-pixel along with the temperature and the variation of the mobility along with the temperature;
the pre-stored variation amount of the threshold voltage and the variation amount of the mobility of the driving transistor of the sub-pixel with temperature may be as shown in fig. 5, and the table shown in fig. 5 includes the variation amount of the threshold voltage and the variation amount of the mobility of the driving transistor of the four sub-pixels (R sub-pixel, G sub-pixel, B sub-pixel, and W sub-pixel) per unit temperature (e.g., 1 ℃) of the rise. Since the driving transistors corresponding to the sub-pixels of different colors may be different (e.g., different aspect ratios) and have test errors, the variation of the threshold voltages with temperature and the variation of the mobilities with temperature of the driving transistors of the sub-pixels of different colors may be different.
In this embodiment of the present invention, optionally, a variation of a threshold voltage of a corresponding driving transistor with temperature and a variation of a mobility of the corresponding driving transistor with temperature may be pre-stored for each sub-pixel of the display panel, and of course, the variation of the same threshold voltage with temperature and the variation of the same mobility with temperature may also be pre-stored for a plurality of pixels, which is not limited in the embodiment of the present invention.
Step 15: and in a frame display stage of the display device, compensating the display data to be output to the sub-pixels according to the threshold voltage compensation value and the mobility compensation value.
In the embodiment of the invention, in the actual display stage of the display device, the influence of temperature change on the mobility and the threshold voltage is considered to obtain the relatively accurate mobility compensation value and threshold voltage compensation value, so that the picture display quality of the display device is improved.
In the embodiment of the present invention, the working process of the display device may be divided into a test phase and an actual display phase, in the test phase, the test phase is mainly used for determining the variation of the threshold voltage of the driving transistor of the sub-pixel with the temperature and the variation of the mobility with the temperature and determining the compensation reference data, and in the actual display phase, the mobility compensation value and the threshold voltage compensation value generated due to the temperature variation are obtained according to the steps 11 to 15, and the variations of the mobility and the threshold voltage are compensated, so as to compensate the short-time afterimage generated due to the temperature factor and improve the picture quality.
The operation of the testing phase is explained below.
1.1 determining the amount of change in threshold voltage and mobility with temperature of the drive transistor of a subpixel
In the embodiment of the present invention, in a test stage before the display device is shipped from factory, the variation of the threshold voltage and the variation of the mobility of the driving transistor of the sub-pixel with temperature (for example, the variation of the threshold voltage and the variation of the mobility are obtained every time the driving transistor of the sub-pixel rises and/or falls by 1 ℃) through actual measurement.
In some embodiments of the present invention, the mobility and the threshold voltage of the driving transistor can be obtained by an Id-Vg (drain current-gate voltage) curve of the driving transistor, referring to fig. 6, fig. 6 is an Id-Vg curve of a driving transistor, and the mobility and the threshold voltage of the driving transistor can be obtained by the Id-Vg curve and the following formula:
where Vth is the threshold voltage of the driving transistor, VGS(1)And VGS(2)Is a gate-source voltage, IDS(1)And IDS(2)Is the drain-source current, muFETo drive the mobility of the transistor, COXIs a capacitance of a gate oxide layer,
is the width to length ratio of the drive transistor.
In some embodiments of the present invention, the variation of the threshold voltage and the variation of the mobility of the driving transistor of each sub-pixel of the display panel with temperature may be sensed and recorded for the subsequent actual compensation process. Of course, it is also possible to sense only the variation of the threshold voltages with temperature and the variation of the mobilities with temperature of the driving transistors of some of the sub-pixels to reduce the sensing number, for example, sense only the variation of the threshold voltages with temperature and the variation of the mobilities with temperature of a plurality of R sub-pixels, and average the calculated variations of the threshold voltages with temperature and the calculated variations of the mobilities with temperature of the driving transistors of the plurality of R sub-pixels to obtain an average value for all the R sub-pixels of the display panel.
For sensing the threshold voltage and the mobility, if the display devices are of the same model, only one display device or a plurality of display devices can be sensed, and the sensing result can be used for other display devices of the same model.
1.2 determining compensated reference data based on the Compensation test
In this embodiment of the present invention, the pre-stored compensation reference data may include: reference sensing data obtained during the test phase, and, a reference mobility obtained during the test phase.
In the embodiment of the invention, in the test stage, the compensation test of the threshold voltage and the migration value can be carried out by adopting a shutdown compensation method at the specified temperature.
The specified temperature is typically ambient (i.e., 25 ℃).
The power-off compensation means that the display device displays a black picture but is not powered off. Since the temperature is lower in the black frame, the sensed values of the mobility and the threshold voltage can be more accurate.
First, it is necessary to sense a relatively accurate threshold voltage (also referred to as a reference threshold voltage) of the driving transistor in the shutdown compensation mode, and the sensed threshold voltage can be set to Vth 1. Referring to fig. 7, display Data is input to the sub-pixel, sensing Data Vsense of the sub-pixel is sensed through the sensing line, and Vth1 has a value equal to Data minus Vsense.
Secondly, based on the reference threshold voltage, a relatively accurate mobility K (which may also be referred to as a reference mobility) is obtained, which may be set as K1, and the relationship between K1 and Data may refer to the following formula:
Vsense＝I×T＝μ1×(Data+Vth1-Vth)^2×T
where Vsense is a sensing voltage of the sub-pixel, I is a current of the driving transistor, T is a charging time of the driving transistor (i.e., the preset charging time), μ 1 is an actual mobility of the driving transistor, Data is display Data input to the sub-pixel, Vth1 is a sensed threshold voltage, Vth is an actual threshold voltage of the driving transistor, oc is a direct proportional function, and LUT is a look-up table function. Since Vth1 is a relatively accurate threshold voltage sensed, it is equivalent to Vth.
According to the above formula, referring to fig. 8, Data + Vth1 can be inputted to the sub-pixel to obtain the reference mobility K1 when sensing K1.
Then, at normal temperature, after a preset charging time period, reference sensing data is obtained based on the reference threshold voltage Vth1 and the reference mobility K1, referring to fig. 9, the reference sensing data may be obtained by the following formula:
where V1 is reference sensing Data, I1 is current of the driving transistor, T is a preset charging duration, μ 1 is actual mobility of the driving transistor, K1 is sensed mobility, Vth1 is sensed threshold voltage, Vth is actual threshold voltage of the driving transistor, oc is a direct proportional function, and L is gray scale Data corresponding to Data. Since Vth1 is a relatively accurate threshold voltage sensed, it is equivalent to Vth.
According to the above formula, referring to fig. 9, when V1 is obtained, the display voltage inputted to the sub-pixel is Data1,
in the embodiment of the present invention, the temperature variation value at the actual display stage may be calculated by using the following formula:
where Δ N is the temperature variation value, K1 is the reference mobility, L is gray data input when a reference threshold voltage is obtained in a test phase, V1 is the reference sensing data, V2 is the actual sensing data, t1 is a pre-stored variation with temperature of the threshold voltage of the driving transistor of the sub-pixel, and t2 is a pre-stored variation with temperature of the mobility of the driving transistor of the sub-pixel.
The derivation of the above formula for calculating the temperature change value is described below.
In the actual display stage, the display panel may generate heat, which may increase the temperature of the display panel, and the actual mobility and threshold voltage of the driving transistor may change due to the temperature change. At this time, the actual sensing data V2 may be sensed through the reference threshold voltage and the reference mobility obtained through the shutdown compensation in the frame idle phase of the actual display phase, and the actual sensing data may be obtained through the following equation:
where V2 is actual sensing Data, I2 is current of the driving transistor, T is a preset charging duration, μ 2 is actual mobility of the driving transistor, K1 is reference mobility, Δ Vth is a variation value of threshold voltage, oc is a direct proportional function, and L is gray scale Data corresponding to Data.
In the actual display phase, the mobility changes from μ 1 to μ 2 and the threshold voltage changes from Vth to Vth + Δ Vth due to temperature change, and the display voltage input to the sub-pixel still follows
Applied, and thus the sensed V2 is calculated using the above equation.
Based on the above formula (1), the following formula (3) can be obtained:
where K2 is a mobility compensation value corresponding to μ 2.
From equation (2) and equation (3), equation (4) can be derived:
where Δ K is the amount of change in mobility.
Thus, a calculation formula of the temperature change value is obtained:
where Δ N is the temperature variation value, K1 is the reference mobility, L is gray data input when a reference threshold voltage is obtained in a test phase, V1 is the reference sensing data, V2 is the actual sensing data, t1 is a pre-stored variation with temperature of the threshold voltage of the driving transistor of the sub-pixel, and t2 is a pre-stored variation with temperature of the mobility of the driving transistor of the sub-pixel.
In an embodiment of the present invention, the calculating a threshold voltage compensation value and a mobility compensation value according to the temperature variation value and a pre-stored variation with temperature of the threshold voltage of the driving transistor of the sub-pixel and a variation with temperature of the mobility includes:
step 141: obtaining compensation variation of the threshold voltage and compensation variation of the mobility according to the temperature variation value and pre-stored variation of the threshold voltage of the driving transistor of the sub-pixel along with the temperature and variation of the mobility along with the temperature;
step 142: and obtaining a threshold voltage compensation value and a mobility compensation value according to the compensation variation of the threshold voltage and the compensation variation of the mobility.
In the embodiment of the present invention, the compensation variation of the threshold voltage is calculated by the following formula: Δ Vth is Δ N × t1, where Δ Vth is a compensation variation of the threshold voltage, Δ N is the temperature variation value, and t1 is a variation of the threshold voltage of the driving transistor of the subpixel with temperature;
the compensation variation amount of the mobility is calculated by the following formula: Δ K is Δ N × t2, Δ K is the compensation variation of the mobility, Δ N is the temperature variation value, and t2 is the variation of the mobility of the driving transistor of the subpixel with temperature.
In an embodiment of the present invention, the obtaining a threshold voltage compensation value and a mobility compensation value according to the compensation variation of the threshold voltage and the compensation variation of the mobility includes:
the threshold voltage compensation value and the mobility compensation value are obtained by searching a threshold voltage compensation table including a threshold voltage compensation value Vth obtained from a reference threshold voltage Vth1 and a variation of different threshold voltages and a mobility compensation table including a mobility compensation value K obtained from a reference mobility K1 and a variation of different mobilities.
Namely, K equals LUT (K1, Δ K), and Vth equals LUT (Vth1, Δ Vth), where the LUT is a look-up table function.
In the embodiment of the present invention, the compensated data voltage is calculated by using the following formula:
data 'is the compensated Data voltage, K is the mobility compensation value, Vth is the threshold voltage compensation value, and L' is the received gray scale Data.
Referring to fig. 10, fig. 10 is a schematic flowchart of a display data compensation method according to another embodiment of the present invention, the display data compensation method includes a test phase and an actual display phase, and includes the following steps:
step 21: obtaining the variation of the threshold voltage of the driving transistor of the sub-pixel along with the temperature and the variation of the mobility along with the temperature;
step 22: compensating for a reference threshold voltage Vth1 and a reference mobility K1 of a driving transistor of the sensing sub-pixel by shutdown;
step 23: obtaining reference sensing data V1 based on the reference threshold voltage Vth1 and the reference mobility K1 obtained at the time of the shutdown compensation;
step 24: in a frame idle phase of the actual display phase, actual sensing data V2 is obtained based on the reference threshold voltage Vth1 and the reference mobility K1;
step 25: obtaining a temperature change value Δ N of the sub-pixel based on the actual sensing data V2, the reference sensing data V1, the reference mobility K1, and the amount of change in threshold voltage with temperature and the amount of change in mobility with temperature;
step 26: obtaining the compensation variation of the threshold voltage and the compensation variation of the mobility according to the temperature variation value delta N, the variation of the threshold voltage along with the temperature and the variation of the mobility along with the temperature;
step 27: obtaining a mobility compensation value according to the compensation variation of the mobility and the reference mobility;
step 28: obtaining a threshold voltage compensation value according to the compensation variation of the threshold voltage and the reference threshold voltage;
the execution sequence of step 27 and step 28 is not limited, and step 27 may be executed first and then step 28 may be executed, or step 28 may be executed first and then step 27 may be executed, or both steps may be executed simultaneously.
Step 29: and in a frame display stage of the display device, compensating the display data to be output to the sub-pixels according to the threshold voltage compensation value and the mobility compensation value.
Wherein, steps 21, 22 and 23 are all executed in the testing stage, and steps 23-29 are executed in the actual display stage.
Based on the same inventive concept, referring to fig. 11, an embodiment of the present invention further provides a display data compensation device applied to a display apparatus, where the display apparatus includes a plurality of sub-pixels, each of the sub-pixels includes a light emitting device and a driving transistor, and the display data compensation device includes:
a data output unit 101, configured to input test display data to the sub-pixels in a frame idle stage of the display apparatus;
a sensing data acquisition unit 102 configured to acquire actual sensing data sensed from the sub-pixels after a preset charging time period elapses;
a temperature variation value calculating unit 103, configured to determine a temperature variation value of the sub-pixel according to the test display data, the actual sensing data, and pre-stored compensation reference data;
a compensation value calculating unit 104 for calculating a threshold voltage compensation value and a mobility compensation value according to the temperature variation value of the sub-pixel and a pre-stored variation of the threshold voltage with temperature and a pre-stored variation of the mobility with temperature of the driving transistor of the sub-pixel;
the data output unit 101 is further configured to compensate, in a frame display stage of the display device, display data to be output to the sub-pixel according to the threshold voltage compensation value and the mobility compensation value.
Optionally, the pre-stored compensation reference data includes:
reference sensing data obtained during a testing phase; and
reference mobility obtained during the test phase.
Optionally, the data voltage supplement device according to the embodiment of the present invention may further include: a reference data calculation unit for calculating the reference sensing data and the reference mobility.
Optionally, the temperature change value is calculated by using the following formula:
where Δ N is the temperature variation value, K1 is the reference mobility, L is gray data input when a reference threshold voltage is obtained in a test phase, V1 is the reference sensing data, V2 is the actual sensing data, t1 is a pre-stored variation with temperature of the threshold voltage of the driving transistor of the sub-pixel, and t2 is a pre-stored variation with temperature of the mobility of the driving transistor of the sub-pixel.
Optionally, the compensation value calculating unit 104 is configured to obtain a compensation variation of the threshold voltage and a compensation variation of the mobility according to the temperature variation value and a pre-stored variation of the threshold voltage of the driving transistor of the sub-pixel with the temperature and a variation of the mobility with the temperature; and obtaining a threshold voltage compensation value and a mobility compensation value according to the compensation variation of the threshold voltage and the compensation variation of the mobility.
Optionally, the compensation variation of the threshold voltage is calculated by the following formula: Δ Vth is Δ N × t1, where Δ Vth is a compensation variation of the threshold voltage, Δ N is the temperature variation value, and t1 is a variation of the threshold voltage of the driving transistor of the subpixel with temperature;
the compensation variation amount of the mobility is calculated by the following formula: Δ K is Δ N × t2, Δ K is the compensation variation of the mobility, Δ N is the temperature variation value, and t2 is the variation of the mobility of the driving transistor of the subpixel with temperature.
Optionally, the compensation value calculating unit 104 is configured to obtain a threshold voltage compensation value and a mobility compensation value by searching a threshold voltage compensation table and a mobility compensation table, where the threshold voltage compensation table includes a threshold voltage compensation value Vth obtained from a reference threshold voltage Vth1 and a variation of a different threshold voltage, and the mobility compensation table includes a mobility compensation value K obtained from a reference mobility K1 and a variation of a different mobility.
Optionally, the compensated data voltage is calculated by using the following formula:
data 'is the compensated Data voltage, K is the mobility compensation value, Vth is the threshold voltage compensation value, and L' is the received gray scale Data.
The display data compensation device in the embodiment of the present invention may be a timing controller.
Referring to fig. 12, fig. 12 is a schematic structural diagram of a timing controller according to an embodiment of the present invention, the timing controller includes the data output unit, the sensing data obtaining unit, the temperature variation value calculating unit, the compensation value calculating unit, and the reference data calculating unit, and further includes a timing converting unit. Referring to fig. 13, fig. 13 is a schematic structural diagram of a display device having a timing controller according to an embodiment of the present invention, where the display device includes a display panel, a timing controller, a memory, a source driver, and a gate driver.
A data voltage supplementing method of the timing controller according to an embodiment of the present invention is described below with reference to fig. 12 and 13:
the Timing controller receives RGB data (i.e., gray data) and Timing Control signals (TC) input from the outside, reads ROM (read only memory) data stored in the memory, and receives sensing data sdata (sensing data) of the sub-pixels output from the source driver; in the operation stage of the display device, the time schedule controller generates display Data and a source Control signal SCS (Source Control Signal) and outputs the display Data and the source Control signal SCS (Source Control Signal) to the source driver; the timing controller generates a gate Control signal gcs (gate Control signal) and outputs the gate Control signal to the gate driver, and finally controls the normal output of the picture.
In the frame idle stage of the display device, the time sequence controller generates test display Data and a source control signal SCS and outputs the test display Data and the source control signal SCS to a source driver; the timing controller generates a gate control signal GCS and outputs it to the gate driver, and obtains actual sensing data SData in cooperation with the gate driver and the source driver. The memory stores a variation value of the mobility compensation value with temperature and a variation value of the threshold voltage with temperature of the driving transistor of each sub-pixel, a reference threshold voltage Vth1, a reference mobility K1 of the driving transistor, and reference sensing data V1 obtained based on the reference mobility and the reference threshold voltage obtained at the time of the power-off compensation, and at the same time, may also store a characteristic value (e.g., threshold voltage Voled) of the light emitting device, an optical compensation characteristic value of the light emitting device, and the like.
The source driver receives display Data and a source control signal SCS, generates corresponding Data voltage and outputs the Data voltage to the display panel through DL (Data line); through the control of the source driver and the gate driver, in the frame idle stage of the display stage, the source driver senses the sub-pixel electrical characteristic value through the SL (sensing line), generates corresponding sensing data Sense data (SData), and outputs the sensing data to the timing controller.
The Gate driver receives the Gate control signal GCS and generates a corresponding Gate signal to output to the display panel through a GL (scanning line) signal.
With reference to fig. 12, the operation of the timing controller in the embodiment of the present invention may be as follows:
the reference data calculation unit receives the sensing data Sdata of the source driver during shutdown compensation, obtains compensation reference data of each sub-pixel through calculation, and stores the compensation reference data into a memory.
The sensing data calculation unit receives the actual sensing data Sdata of the source driver in the real-time display stage, performs digital-to-analog conversion and the like, and outputs the data to the temperature change value calculation unit.
The temperature change value calculating unit receives the actual sensing data, reads the reference compensation data in the memory, and generates a temperature change value through calculation.
The compensation value calculation unit reads the variation of the threshold voltage along with the temperature and the variation of the mobility along with the temperature in the memory, receives the temperature variation value output by the temperature variation value calculation unit, calculates the mobility compensation value and the compensation variation of the threshold voltage, and outputs the mobility compensation value and the compensation variation of the threshold voltage to the data output unit.
The Data output unit outputs the compensated display Data to the source driver based on the RGB Data, the mobility compensation value, and the compensation variation amount of the threshold voltage.
The embodiment of the invention also provides a display device which comprises the display data compensation device.
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 the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. 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 are changed accordingly.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (13)
1. A display data compensation method applied to a display apparatus including a plurality of sub-pixels each including a light emitting device and a driving transistor, the method comprising:
inputting test display data to the sub-pixels in a frame idle stage of the display device;
acquiring actual sensing data sensed from the sub-pixels after a preset charging time period;
determining the temperature change value of the sub-pixel according to the test display data, the actual sensing data and pre-stored compensation reference data;
calculating a threshold voltage compensation value and a mobility compensation value according to the temperature change value of the sub-pixel, and the pre-stored variation of the threshold voltage of the driving transistor of the sub-pixel along with the temperature and the variation of the mobility along with the temperature;
in a frame display stage of the display device, compensating the display data to be output to the sub-pixels according to the threshold voltage compensation value and the mobility compensation value;
the pre-stored compensation reference data comprises:
reference sensing data obtained during a testing phase; and
a reference mobility obtained at the test stage;
the temperature change value is calculated by adopting the following formula:
where Δ N is the temperature variation value, K1 is the reference mobility, L is gray data input when a reference threshold voltage is obtained in a test phase, V1 is the reference sensing data, V2 is the actual sensing data, t1 is a pre-stored variation with temperature of the threshold voltage of the driving transistor of the sub-pixel, and t2 is a pre-stored variation with temperature of the mobility of the driving transistor of the sub-pixel.
2. The method for compensating display data according to claim 1, wherein the test phase is a compensation test of the threshold voltage and the transition value by using a shutdown compensation mode at a specified temperature.
3. The display data compensation method of claim 1 or 2, wherein the reference sensing data is obtained by:
sensing a reference threshold voltage Vth1 in a test phase, wherein when the reference threshold voltage is sensed, a display voltage input to the sub-pixel is Data;
inputting Data + Vth1 to the sub-pixel to obtain a reference mobility K1;
data1 is input to the sub-pixels, where,
and acquiring reference sensing Data V1 sensed from the sub-pixels after the preset charging time period, wherein L is gray Data corresponding to Data.
4. The method of claim 1, wherein the calculating the threshold voltage compensation value and the mobility compensation value according to the temperature variation value and the pre-stored variation of the threshold voltage with temperature and the variation of the mobility with temperature of the driving transistor of the sub-pixel comprises:
obtaining compensation variation of the threshold voltage and compensation variation of the mobility according to the temperature variation value and pre-stored variation of the threshold voltage of the driving transistor of the sub-pixel along with the temperature and variation of the mobility along with the temperature;
and obtaining a threshold voltage compensation value and a mobility compensation value according to the compensation variation of the threshold voltage and the compensation variation of the mobility.
5. The display data compensation method of claim 4,
the compensation variation of the threshold voltage is calculated by the following formula: Δ Vth is Δ N × t1, where Δ Vth is a compensation variation of the threshold voltage, Δ N is the temperature variation value, and t1 is a variation of the threshold voltage of the driving transistor of the subpixel with temperature;
the compensation variation amount of the mobility is calculated by the following formula: Δ K is Δ N × t2, Δ K is the compensation variation of the mobility, Δ N is the temperature variation value, and t2 is the variation of the mobility of the driving transistor of the subpixel with temperature.
6. The method as claimed in claim 4, wherein the obtaining of the threshold voltage compensation value and the mobility compensation value according to the compensation variation of the threshold voltage and the compensation variation of the mobility comprises:
the threshold voltage compensation value and the mobility compensation value are obtained by searching a threshold voltage compensation table including a threshold voltage compensation value Vth obtained from a reference threshold voltage Vth1 and a variation of different threshold voltages and a mobility compensation table including a mobility compensation value K obtained from a reference mobility K1 and a variation of different mobilities.
7. The display data compensation method of claim 1, wherein the compensated data voltage is calculated using the following formula:
data 'is the compensated Data voltage, K is the mobility compensation value, Vth is the threshold voltage compensation value, and L' is the received gray scale Data.
8. A display data compensation device applied to a display apparatus including a plurality of sub-pixels each including a light emitting device and a driving transistor, the display data compensation device comprising:
a data output unit for inputting test display data to the sub-pixels in a frame idle stage of the display device;
a sensing data acquisition unit for acquiring actual sensing data sensed from the sub-pixels after a preset charging time period;
the temperature change value calculation unit is used for determining the temperature change value of the sub-pixel according to the test display data, the actual sensing data and pre-stored compensation reference data;
the compensation value calculating unit is used for calculating a threshold voltage compensation value and a mobility compensation value according to the temperature change value of the sub-pixel, and the pre-stored variation of the threshold voltage of the driving transistor of the sub-pixel along with the temperature and the variation of the mobility along with the temperature;
the data output unit is further configured to compensate, in a frame display stage of the display device, display data to be output to the sub-pixel according to the threshold voltage compensation value and the mobility compensation value;
the pre-stored compensation reference data comprises:
reference sensing data obtained during a testing phase; and
a reference mobility obtained at the test stage;
the temperature change value is calculated by adopting the following formula:
where Δ N is the temperature variation value, K1 is the reference mobility, L is gray data input when a reference threshold voltage is obtained in a test phase, V1 is the reference sensing data, V2 is the actual sensing data, t1 is a pre-stored variation with temperature of the threshold voltage of the driving transistor of the sub-pixel, and t2 is a pre-stored variation with temperature of the mobility of the driving transistor of the sub-pixel.
9. The display data compensation device of claim 8,
the compensation value calculating unit is used for obtaining the compensation variation of the threshold voltage and the compensation variation of the mobility according to the temperature variation value, the pre-stored variation of the threshold voltage of the driving transistor of the sub-pixel along with the temperature and the pre-stored variation of the mobility along with the temperature; and obtaining a threshold voltage compensation value and a mobility compensation value according to the compensation variation of the threshold voltage and the compensation variation of the mobility.
10. The display data compensation device of claim 9,
the compensation variation of the threshold voltage is calculated by the following formula: Δ Vth is Δ N × t1, where Δ Vth is a compensation variation of the threshold voltage, Δ N is the temperature variation value, and t1 is a variation of the threshold voltage of the driving transistor of the subpixel with temperature;
the compensation variation amount of the mobility is calculated by the following formula: Δ K is Δ N × t2, Δ K is the compensation variation of the mobility, Δ N is the temperature variation value, and t2 is the variation of the mobility of the driving transistor of the subpixel with temperature.
11. The display data compensation device of claim 9,
the compensation value calculating unit is configured to obtain a threshold voltage compensation value and a mobility compensation value by searching a threshold voltage compensation table and a mobility compensation table, where the threshold voltage compensation table includes a threshold voltage compensation value Vth obtained from a reference threshold voltage Vth1 and a different threshold voltage variation, and the mobility compensation table includes a mobility compensation value K obtained from a reference mobility K1 and a different mobility variation.
12. The display data compensation device of claim 8, wherein the compensated data voltage is calculated using the following formula:
data 'is the compensated Data voltage, K is the mobility compensation value, Vth is the threshold voltage compensation value, and L' is the received gray scale Data.
13. A display apparatus comprising the display data compensation device according to any one of claims 8 to 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910323765.1A CN109949748B (en) | 2019-04-22 | 2019-04-22 | Display data compensation method, display data compensation device and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910323765.1A CN109949748B (en) | 2019-04-22 | 2019-04-22 | Display data compensation method, display data compensation device and display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109949748A CN109949748A (en) | 2019-06-28 |
| CN109949748B true CN109949748B (en) | 2020-12-08 |
Family
ID=67014569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910323765.1A Active CN109949748B (en) | 2019-04-22 | 2019-04-22 | Display data compensation method, display data compensation device and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109949748B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110444163B (en) | 2019-08-15 | 2021-05-04 | 京东方科技集团股份有限公司 | Pixel circuit, display panel and display device |
| CN110930913B (en) | 2019-12-10 | 2021-10-22 | 京东方科技集团股份有限公司 | Display compensation data, data detection method and device and display panel |
| CN114495849A (en) * | 2020-10-23 | 2022-05-13 | 华硕电脑股份有限公司 | Electronic device and display image compensation method thereof |
| CN112951156B (en) * | 2021-01-28 | 2023-02-03 | 北京京东方光电科技有限公司 | Display compensation method, display compensation device and display device |
| CN113192451B (en) * | 2021-04-28 | 2024-04-19 | 京东方科技集团股份有限公司 | Compensation control method and display device |
| CN118076989A (en) * | 2022-07-28 | 2024-05-24 | 京东方科技集团股份有限公司 | Compensation method and device for display device and storage medium |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003330419A (en) * | 2002-05-15 | 2003-11-19 | Semiconductor Energy Lab Co Ltd | Display device |
| JP5055963B2 (en) * | 2006-11-13 | 2012-10-24 | ソニー株式会社 | Display device and driving method of display device |
| JP4640449B2 (en) * | 2008-06-02 | 2011-03-02 | ソニー株式会社 | Display device, driving method thereof, and electronic apparatus |
| CN108399891B (en) * | 2018-05-31 | 2023-07-28 | 京东方科技集团股份有限公司 | Method for driving organic light emitting display device, driving controller and display device |
| CN109493805B (en) * | 2018-12-12 | 2021-04-27 | 合肥鑫晟光电科技有限公司 | Compensation method and device of display panel |
-
2019
- 2019-04-22 CN CN201910323765.1A patent/CN109949748B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109949748A (en) | 2019-06-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109949748B (en) | Display data compensation method, display data compensation device and display device | |
| CN108369792B (en) | Display device and driving method thereof | |
| CN109166526B (en) | Temperature compensation method and device and display device | |
| CN109493805B (en) | Compensation method and device of display panel | |
| TWI383356B (en) | Electroluminescent display compensated analog transistor drive signal | |
| US9711092B2 (en) | Display device and method for driving same | |
| US8749457B2 (en) | Organic electroluminescence display device manufacturing method and organic electroluminescence display device | |
| US8830148B2 (en) | Organic electroluminescence display device and organic electroluminescence display device manufacturing method | |
| KR101282996B1 (en) | Organic electro-luminescent display device and driving method thereof | |
| US8242985B2 (en) | Display device and method for manufacturing the same | |
| US9659528B2 (en) | Organic light emitting display device and method for driving the same | |
| KR20200134584A (en) | Display driving circuit and display device comprising thereof | |
| WO2014069324A1 (en) | Data processing device for display device, display device equipped with same and data processing method for display device | |
| US10141020B2 (en) | Display device and drive method for same | |
| EP3696803B1 (en) | Pixel compensation method and system, display device | |
| JP2012519881A (en) | Electroluminescent display compensated drive signal | |
| CN113853645B (en) | Display device and driving method thereof | |
| KR20150073694A (en) | Organic Light Emitting Display Device and Method of Driving The Same | |
| KR102648976B1 (en) | Light Emitting Display Device and Driving Method thereof | |
| KR20160018969A (en) | Organic light emitting display device | |
| KR102281009B1 (en) | Orgainc emitting diode display device and method for driving the same | |
| KR102281008B1 (en) | Orgainc emitting diode display device and method for driving the same | |
| TWI427593B (en) | Organic light-emitting diode display module, organic light-emitting diode display apparatus and image compensation methods thereof | |
| KR102245999B1 (en) | Orgainc emitting diode display device and sensing method thereof | |
| KR102293366B1 (en) | Organic light emitting diode and driving method of the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |