CN116403527B - Dynamic display smear compensation device and method - Google Patents
Dynamic display smear compensation device and method Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
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- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Abstract
The invention discloses a dynamic display smear compensation device and a method, comprising the following steps: judging whether the input gray-scale data meets gray-scale modulation conditions or not; modulating gray scale; obtaining a corresponding output voltage value through a third lookup table or a third conversion function; and (5) adjusting 0 gray scale voltage. The invention can avoid the influence of low brightness caused by insufficient capacitor charge of the gray scale between 0 gray scale and threshold gray scale, and simultaneously reduce the voltage drift caused by hysteresis effect when the gray scale is driven below the threshold; the invention does not need to readjust the gamma curve, has simpler implementation scheme and can adapt to each screen; the invention refers to a mode of counting the gray scale below the reference gray scale in the previous frame or multi-frame information, and performs normalized iterative calculation on the threshold voltage drift caused by the current pixel historical driving voltage, so that the result is more accurate.
Description
Technical Field
The invention belongs to the field of integrated circuit design, and particularly relates to a dynamic display smear compensation device and method.
Background
In recent years, in order to further improve the endurance of battery-type complete machines, manufacturers such as NB, pad and mobile phones and the like optimize the software system, and push out a dark UI mode, namely, most UI application interfaces, the background adopts a black or brightness-reduced background to realize the overall low energy consumption of the self-luminous display, so that the service time is further prolonged, but the problems of dynamic display picture trailing and color dragging under the dark background are particularly prominent, such as the problem of trailing/color shifting at the edges of fonts and lines when the UI interface is dragged.
In the typical AMOLED display pixel driving circuit shown in fig. 1 and 2, the threshold voltage Vth is unstable due to the hysteresis effect of the driving transistor T2, so that a dynamic picture is displayed, and the corresponding gray scale currents are different from a black picture to an intermediate gray scale picture and from a white picture to the same intermediate gray scale picture, so that the brightness of the picture is different, that is, the problem of smear of the dynamic display picture appears.
Meanwhile, as shown in fig. 3, the light emitting process of the OLED, the EL display emits light after charging the capacitor of the OLED to an anode potential greater than the turn-on voltage Vt0, the anode potential reaches the saturation voltage Vst, and the light emitting stabilization process, i.e., the light emitting stabilization time depends on the charged current and the voltage difference between Vst and Vinit. Therefore, when the brightness is low, that is, the current for charging the OLED device is low, the charging time of the row of the display light emitting device is shorter, so that the anode potential cannot be charged to the saturation voltage, that is, stable brightness cannot be achieved, particularly, for red, green and blue OLEDs, the corresponding equivalent capacitances are different, so that the required charging time is different, the brightness in white balance cannot be achieved in the process of dynamic display of the picture, the picture is displayed as a dynamic picture smear, and generally, the smear is often purple due to the longer response time of green light.
At present, the following schemes are mainly adopted to solve the problems:
1. in the paper by Na et al (Na S H, min W K, kim D H, et al enhancement of picture quality on ultra-low brightness by optimizing the electrical potential required for OLED charging in the AMOLED displays [ J ]. Journal of Information Display,2021,22 (4): 275-284.), a method of splitting the circuit of a pixel circuit Vref into two paths is mentioned, and charging of Vint to Vst is shortened by adjusting the anode reset voltage Vint (Vref) of an OLED device.
2. In the publication CN110390910a, there is mentioned a method of improving the variation of the threshold voltage Vth due to the hysteresis effect by adjusting the voltage corresponding to the low gray level.
3. In the patent with publication numbers CN103854600a and KR1020170072994a, it is mentioned that luminance estimation is performed on current frame data by referring to previous frame information, and corresponding luminance is further compensated to achieve a state that the current frame reaches the target luminance; further, the gray scales below the reference gray scale in the previous multiframe can be counted to obtain the corresponding weight, and the corresponding brightness can be more accurately compensated.
The scheme has the following defects:
1. the difference between Vint and Vst is reduced, so that the problem of insufficient charging time of the rgbd oled light emitting device under low brightness and low current is mainly solved, but Vinit is easy to cause early lighting of the rgbd oled device in a black state if the Vinit is increased more.
2. The voltage corresponding to the low gray level is adjusted, so that the influence of hysteresis effect on Vth is reduced, the gamma curve needs to be recalibrated, and when different adjustment modes are adopted for RGB pixels, the complexity of circuit design is further increased.
3. The brightness of the current frame is adjusted by carrying out brightness estimation on the current frame data by referring to the previous multi-frame information, the weight is determined by counting, and the brightness change of the current pixel caused by threshold voltage drift cannot be accurately estimated, so that the compensation is not accurate enough.
In addition, the above-described 3 rd scheme compensates for the hysteresis effect in a different aspect from the first two schemes, and thus can be used in combination.
Disclosure of Invention
Therefore, the present invention aims to provide a dynamic display smear compensation method and an implementation device thereof, which integrate the advantages of the prior art scheme, overcome the defects thereof, and perform dynamic display smear compensation more comprehensively and effectively.
In order to achieve the above object, an aspect of the present invention provides a dynamic display smear compensation method, including the following steps:
step S1: judging whether the input gray-scale data meets the preset gray-scale modulation condition,
for gray-scale data or a part of gray-scale data satisfying the gray-scale modulation condition, step S2 is performed,
step S2 is skipped for gray scale data or part of gray scale data which does not meet gray scale modulation conditions;
step S2: modulating gray scale: the gray-scale data to be modulated are represented by the combination of 0 gray scale and preset threshold gray scale, so that the average brightness of the gray-scale data to be modulated is equivalent;
step S6: according to the gray-scale data without gray-scale modulation or the gray-scale data after gray-scale modulation, obtaining a corresponding output voltage value through a third lookup table or a third conversion function;
step S7:0 gray scale voltage adjustment: judging whether the output voltage value obtained in the step S6 is an output voltage value corresponding to 0 gray scale;
if yes, the voltage is adjusted to be 0 gray scale adjusting voltage value and output, if not, the voltage is directly output, and the 0 gray scale adjusting voltage value is between the output voltage value corresponding to 0 gray scale and the output voltage value corresponding to 1 gray scale.
Preferably, the gray scale modulation conditions are: for a number of adjacent pixels of a number of adjacent frames, the average gray level is below the threshold gray level.
Preferably, the following steps are further included between step S2 and step S6:
step S3: according to the gray-scale data without gray-scale modulation or the gray-scale data after gray-scale modulation, obtaining a voltage drift output value DeltaV of the corresponding current frame through a first lookup table or a first conversion function cur (n), wherein n represents that the current frame is an nth frame;
step S4: calculating a historical accumulated voltage drift output value DeltaV of the current frame according to the voltage drift output values DeltaV of a plurality of frames before the current frame cur (k) Calculated (may be DeltaV for convenience) cur (k) Wherein k represents the kth frame, k.ltoreq.n;
step S5: brightness compensation: acquiring a corresponding gray-scale data correction value through a second lookup table according to gray-scale data without gray-scale modulation or gray-scale data after gray-scale modulation and the historical accumulated voltage drift output value DeltaV calculated in the step S4;
in step S6, the gray-scale data correction value obtained in step S5 is used to replace the gray-scale data without gray-scale modulation or the gray-scale data after gray-scale modulation.
Preferably, the method of calculating the historical accumulated voltage drift output value Δv of the current frame in step S4 is iterative calculation.
Preferably, the specific method of iterative calculation is to calculate a historical accumulated voltage drift output value Δv according to formula (1);
ΔV＝ΔV’*(1-α)+ΔV cur (n)*α (1)；
wherein: deltaV' is the historical accumulated voltage drift output value before iterating the current frame, deltaV cur And (n) is a voltage drift output value of the current frame, n represents that the current frame is an nth frame, alpha is a preset proportionality coefficient, and the initial value of the historical accumulated voltage drift output value is 0.
Preferably, after step S4, the method further comprises the steps of: the historical accumulated voltage drift output value DeltaV is stored in a historical frame information storage unit.
Preferably, the first lookup table stores only a part of the voltage drift output value Δv corresponding to the gray-scale data cur (n) voltage drift output value DeltaV not stored in the first lookup table cur (n) obtained by interpolation;
the second lookup table only stores part of gray-scale data and gray-scale data correction values corresponding to part of historical accumulated voltage drift output values DeltaV, and the gray-scale data correction values not stored in the second lookup table are obtained through interpolation.
Preferably, in step S2, the gray-scale data to be modulated is represented by a combination of 0 gray-scale and a threshold gray-scale, so that the average brightness of the gray-scale data and the threshold gray-scale data is equivalent, specifically:
the gray-scale data to be modulated are the gray-scale data of a plurality of adjacent pixels;
and setting the gray scale data of the adjacent pixels to be 0 gray scale or threshold gray scale according to a preset pattern or a random pattern, so that the average brightness of the pixels after setting is equivalent to the average brightness corresponding to the gray scale data to be modulated.
Preferably, in step S2, the gray-scale data to be modulated is represented by a combination of 0 gray-scale and a threshold gray-scale, so that the average brightness of the gray-scale data and the threshold gray-scale data is equivalent, specifically:
the gray-scale data to be modulated are the gray-scale data of a plurality of adjacent frames of single pixels;
and respectively setting the gray scale data of a plurality of adjacent frames of the single pixel to be 0 gray scale or threshold gray scale according to a preset sequence or a random sequence, so that the average brightness of the frames after setting is equivalent to the average brightness corresponding to the gray scale data to be modulated.
Preferably, in step S2, the gray-scale data to be modulated is represented by a combination of 0 gray-scale and a threshold gray-scale, so that the average brightness of the gray-scale data and the threshold gray-scale data is equivalent, specifically:
the gray-scale data to be modulated are the gray-scale data of a plurality of adjacent frames of a plurality of adjacent pixels;
and respectively setting the gray-scale data of the adjacent frames of the adjacent pixels to be 0 gray scale or threshold gray scale according to a preset pattern and sequence or a random pattern and sequence, so that the average brightness of the frames of the pixels after setting is equivalent to the average brightness corresponding to the gray-scale data to be modulated.
Another aspect of the present invention provides a dynamic display smear compensation apparatus, including: the device comprises a gray scale modulation module, a gamma conversion module and a 0 gray scale voltage adjustment module;
the gray scale modulation module is used for executing the step S1 and the step S2, and then transmitting gray scale data without gray scale modulation and/or gray scale data after gray scale modulation to the gamma conversion module;
the gamma conversion module is used for executing the step S6, and is electrically connected with the 0 gray scale voltage adjustment module;
the 0 gray scale voltage adjustment module is configured to execute the step S7.
Preferably, the method further comprises: the system comprises a gray level conversion module, a history frame information superposition module, a history frame information storage unit and a current frame brightness compensation module;
the gray scale modulation module, the gray scale conversion module, the historical frame information superposition module and the current frame brightness compensation module are electrically connected in sequence, the historical frame information superposition module is also electrically connected with the historical frame information storage unit, and the current frame brightness compensation module is electrically connected with the gray scale modulation module and the gamma conversion module respectively;
the gray scale modulation module transmits gray scale data without gray scale modulation and/or gray scale data after gray scale modulation to the gamma conversion module to replace the gray scale data with the gamma conversion module: the gray level modulation module transmits gray level data without gray level modulation and/or gray level data after gray level modulation to the current frame brightness compensation module, and transmits the gray level data to the gamma conversion module after being processed by the current frame brightness compensation module;
the gray level conversion module is configured to execute the step S3, the history information superimposing module is configured to execute the step S4, the current frame brightness compensation module is configured to execute the step S5, and the history frame information storage unit is configured to store data required for calculating the history accumulated voltage drift output value Δv in the step S4.
The invention has the following beneficial effects:
(1) Compared with the first technical scheme, the method directly avoids the influence of low brightness caused by insufficient capacitor charging of gray scales between 0 gray scale and threshold gray scale, and simultaneously reduces voltage drift caused by hysteresis effect during gray scale driving below the threshold;
(2) Compared with the second prior art, the invention only adjusts the output voltage value corresponding to 0 gray scale, does not need to readjust the gamma curve, has simpler realization scheme and can be adapted to each screen;
(3) Compared with the prior art III, the method for counting the gray levels below the reference gray level in the previous frame or the multi-frame information is referred to, and the normalized iterative calculation is carried out on the threshold voltage drift caused by the current pixel historical driving voltage, so that the result is more accurate.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 to 3 are schematic diagrams of a prior art display pixel driving circuit;
FIG. 4 is a flow chart of a dynamic display smear compensation method disclosed in the present invention;
FIGS. 5A-5C are schematic diagrams illustrating the modulation gray scale disclosed in the present invention;
FIG. 6 is a schematic diagram of a first lookup table according to the present disclosure;
FIG. 7 is a schematic diagram of a second lookup table according to the present disclosure;
FIG. 8 is a schematic diagram of a third lookup table according to the present disclosure;
FIG. 9 is a schematic diagram of a dynamic display smear compensation apparatus according to the present invention;
fig. 10 is a schematic diagram of three channels of RGB according to a fourth embodiment of the present invention.
Detailed Description
One of the cores of the invention is to provide a dynamic display smear compensation method and a realization device thereof, which integrate the advantages of the prior art scheme, overcome the defects thereof and more comprehensively and effectively carry out dynamic display smear compensation.
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in fig. 4, the dynamic display smear compensation method disclosed in the present embodiment includes the following steps:
step S1: judging whether the input gray-scale data meets the preset gray-scale modulation condition,
for gray-scale data or a part of gray-scale data satisfying the gray-scale modulation condition, step S2 is performed,
step S2 is skipped for gray scale data or part of gray scale data which does not meet gray scale modulation conditions;
the gray scale modulation conditions are as follows: for a plurality of adjacent pixels of a plurality of adjacent frames, the average gray level is lower than a preset threshold gray level.
Step S2: modulating gray scale: the Gray-scale data to be modulated is represented by a combination of 0 Gray scale (Gray 0) and a threshold Gray scale so that the average brightness of the two is equivalent.
Specifically, as shown in fig. 5A to 5C, there are three modes, i.e., temporal superposition, spatial superposition, and space-time superposition, and here, the Gray scale between Gray0 and Gray4 is represented by a combination of Gray0 and Gray4, taking the threshold Gray scale of 4 (Gray 4) as an example.
In some embodiments, for the time superposition approach, as shown in fig. 5A, 4 frames are taken as an example; when the time superposition sequence is 1 frame of data/voltage is Gray4 and 3 frames of data/voltage is Gray0, the average data/voltage after superposition is Gray1; when the time superposition sequence is 2 frames of data/voltage is Gray4, 2 frames of data/voltage is Gray0, the average data/voltage after superposition is Gray2, and so on.
In other embodiments, for the spatial overlay mode, as shown in fig. 5B, 4 pixels are taken as an example; when the space superposition pattern is 1 pixel data/voltage Gray4 and 3 pixel data/voltages Gray0, the average data/voltage after superposition is Gray1; when the spatial superposition pattern is 2 pixel data/voltages Gray4 and 2 pixel data/voltages Gray0, the average data/voltage after superposition is Gray2, and so on.
In other embodiments, the time stacking and space stacking modes may be combined to obtain a space-time stacking mode, as shown in fig. 5C, which is a look-up table (LUF) implementation mode (the time stacking and space stacking modes may also be implemented by a look-up table mode), that is, in a look-up table of 0 to 4 Gray scales of 0 to 4 frames, a corresponding coefficient is found, if the coefficient is 0, the Gray scale Gray0 is output, and if the coefficient is 1, the Gray scale Gray4 is output.
Therefore, after Gray scale modulation, the influence of 1-3 Gray scales (Gray 1-Gray 3) on the bright state is reduced, and only the influence of 0/4 Gray scale on the bright state is reserved, and meanwhile, the problem of insufficient capacitor charging caused by smaller current of 1-3 Gray scales can be relieved.
It should be noted that, as the range of temporal and/or spatial superposition increases, side effects such as discontinuous brightness and block effect are easy to be seen in the display effect, the threshold gray level can be generally set according to the experience of those skilled in the art, the gray level is modulated below the threshold gray level, and the gray level modulation step is skipped above the threshold gray level.
Step S3: according to the gray-scale data without gray-scale modulation or the gray-scale data after gray-scale modulation, the voltage drift output value DeltaV of the corresponding current frame is obtained through a first lookup table (figure 6) cur (n), wherein n represents the current frame as the nth frame, the voltage drift output value DeltaV of the current frame cur (n) available for current frame brightness compensation reference.
Generally, the drift of the threshold voltage in the hysteresis effect is caused by that the interface state trap of the gate insulating layer is induced by the applied gate voltage to capture or release electrons and holes under the action of an electric field, so that the threshold voltage drift is different in the same time compared with the threshold voltage drift caused in the steady state in 0-255 gray scale.
The first lookup table shown in fig. 6 records the shift of the threshold voltage (expressed as a dimensionless value Δv/V) corresponding to a part of gray scales of 0 to 255, and normalizes the shift output value according to gray scale value units. To further reduce the memory size of the LUT, it may be stored by means of downsampling, and by means of table look-up interpolation. In other embodiments, the first lookup table may store all of the correspondence.
In other embodiments, instead of using a look-up table, the first conversion function may be obtained by using a data fitting method, and the conversion from the input gray scale to the voltage drift output value may be implemented by using the first conversion function.
Step S4: iteratively calculating a historical accumulated voltage drift output value DeltaV of the current frame according to a formula (1):
ΔV＝ΔV’*(1-α)+ΔV cur (n)*α (1)；
wherein: deltaV' is the historical accumulated voltage drift output value before iterating the current frame, deltaV cur And (n) is a voltage drift output value of the current frame, n represents that the current frame is an nth frame, alpha is a preset proportionality coefficient, and the initial value of the historical accumulated voltage drift output value is 0.
Generally, when the gate electrode electric stress applied by the driving tube is continuously changed, the interface state trap of the gate insulating layer continuously captures or releases electrons and holes under the action of the electric field, so that the charge corresponding to the capacitance of the gate insulating layer is changed, and the state corresponding to the applied voltage of the current frame is related to the change of the accumulated threshold voltage before the previous frame, i.e. the historical accumulated voltage drift output value DeltaV 'when the previous frame, so that DeltaV' generated by the historical frame information is required to be related to DeltaV caused by the applied voltage of the current frame cur And (n) performing superposition, namely performing superposition through a formula (1) to obtain the current delta V.
In other embodiments, ΔV generated by historical frames, rather than by iterative calculations, may be used cur (k) And carrying out linear combination according to a preset weight relation (k represents a k frame, and k is less than or equal to n) to obtain a historical accumulated voltage drift output value delta V, wherein the historical accumulated voltage drift output value delta V can be obtained through calculation by other reasonable functions.
Step S5: brightness compensation is carried out on the current frame: and according to the gray-scale data without gray-scale modulation or the gray-scale data after gray-scale modulation and the historical accumulated voltage drift output value DeltaV calculated in the step S4, acquiring a corresponding gray-scale data correction value through a second lookup table (figure 7). Similarly to the first look-up table, the second look-up table may also store only part of the data, the non-stored part being calculated by interpolation.
In other embodiments, the second lookup table may also store all of the correspondence.
Since the brightness compensation method and the gray scale voltage adjustment method adopted in steps S3 to S5 are two different ways to compensate the dynamic display smear, in other embodiments, only one way may be adopted to compensate.
Step S6: and (3) acquiring corresponding output voltage values through a third lookup table (a gamma lookup table in fig. 8, namely, a gamma lookup table corresponding to 0-4095 different gray scales) according to the gray scale data correction value obtained in the step (S5).
The parameters of the gamma lookup table or the gamma conversion function are generally stored in the gamma conversion module, the gamma conversion module can convert the input gray scale into a corresponding voltage value, the voltage value is converted into a corresponding source voltage through the DAC conversion circuit to drive the display to display, so that the relation between the corresponding brightness and the gray scale of the display meets the gamma curve.
Step S7:0 gray scale voltage adjustment: judging whether the output voltage value obtained in the step S6 is an output voltage value corresponding to 0 gray scale;
if yes, the voltage is adjusted to 0 gray scale adjustment voltage value and output, if not, the voltage is directly output,
the 0 gray scale adjustment voltage value is between the output voltage value corresponding to the 0 gray scale and the output voltage value corresponding to the 1 gray scale.
In the step of gray scale modulation, gray scales below the threshold gray scale are modulated by superposition in time and/or space, but pixels displaying 0 gray scale are still reserved (or increased), so that the influence of dark state on bright state can be improved by 0 gray scale voltage adjustment before data is output.
Generally, the output voltage value corresponding to the 0 gray scale is generally higher, so that dark states corresponding to displays of all batches are ensured to be black enough, but the influence on the brightness of the current frame is the largest when the previous frame data is 0 gray scale, and the output voltage value corresponding to the 1 gray scale is known after gamma conversion, so that in order to ensure that the display corresponding to the 0 gray scale is still dark state, the problem of smear caused by overlarge 0 gray scale voltage is improved, and the output voltage value of the 0 gray scale can be adjusted to be the voltage between the 0 gray scale and the 1 gray scale.
Fig. 9 shows a dynamic display smear compensation apparatus disclosed in this embodiment, including: the device comprises a gray scale modulation module, a gamma conversion module, a 0 gray scale voltage adjustment module, a gray scale conversion module, a history frame information superposition module, a history frame information storage unit and a current frame brightness compensation module.
The system comprises a gray scale modulation module, a gray scale conversion module, a historical frame information superposition module, a current frame brightness compensation module, a gamma conversion module and a 0 gray scale voltage adjustment module which are electrically connected in sequence, wherein the current frame brightness compensation module is also electrically connected with the gray scale modulation module, and the historical frame information superposition module is also electrically connected with a historical frame information storage unit.
The gray scale modulation module is used for executing the step S1 and the step S2, and the gray scale conversion module, the history frame information superposition module, the current frame brightness compensation module, the gamma conversion module and the 0 gray scale voltage adjustment module are sequentially used for executing the step S3 to the step S7.
The history frame information storage unit is used for storing data (in the case of iterative calculation, only the history accumulated voltage drift output value Δv' of the previous frame is needed to be stored) required for calculating the history accumulated voltage drift output value Δv in the step S4, and the history frame information storage unit supports the function of reading and writing, and is typically implemented as a Static Random Access Memory (SRAM), a Dynamic Random Access Memory (DRAM), or other types of memories.
In other embodiments, according to the module structure of the solution adjustment device actually adopted, for example, for the case where brightness compensation is not adopted, only the gray-scale modulation module, the gamma conversion module and the 0 gray-scale voltage adjustment module may be reserved, and the gray-scale modulation module, the gamma conversion module and the 0 gray-scale voltage adjustment module are electrically connected in sequence; for the occasion of adopting only brightness compensation, a gray level conversion module, a history frame information superposition module, a history frame information storage unit and a current frame brightness compensation module can be reserved, and the gray level conversion module, the history frame information superposition module and the current frame brightness compensation module are electrically connected in sequence, and the history frame information superposition module is electrically connected with the history frame information storage unit
Example two
The difference between the present embodiment and the first embodiment is that the order and/or pattern satisfying the conditions generated in step S2 is a random order and/or a random pattern, which can be specifically implemented by setting a linear feedback shift register in the gray scale modulation module, and generating a pseudo random number of Nbit by each frame through the linear feedback shift register, and since the probability of the random number in time and space is substantially uniform, each pixel can be set to 0 gray scale or threshold gray scale with a required probability instead of the lookup table, so as to implement modulation of intermediate gray scale.
Example III
The difference between the present embodiment and the first embodiment is that the method of calculating the historical accumulated voltage drift output value Δv of the current frame in step S4 is to calculate the historical accumulated voltage drift output value Δv according to formula (2):
ΔV＝∑ΔV cur (k)*e -(t/τ)β +ΔV cur (n) (2)；
wherein: τ is the time constant for capturing electrons and holes, β is the exponential constant, deltaV cur (k) For threshold voltage variation of past frames, k<n, t is the time of the current frame relative to the previous frame, deltaV cur (n) is a threshold voltage change caused by the current frame.
When α=e -(t1/τ)β When (t 1 is the time of the current frame relative to the previous frame), the formula corresponds to formula (1) in iterative calculation.
Example IV
The difference between the present embodiment and the first embodiment is that, as shown in fig. 10, since the threshold voltages of the RGB OLED devices are different, the gamma voltages at which the OLED devices start to light up are different (about 90, 80, 100 reduced units for the RGB channels in the figure), so that different 0 gray scale voltage adjustment values can be applied for the RGB three channels in step S7, thereby further improving the smear phenomenon.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (12)
1. The dynamic display smear compensation method is characterized by comprising the following steps:
step S1: judging whether the input gray-scale data meets the preset gray-scale modulation condition,
for gray-scale data or a part of gray-scale data satisfying the gray-scale modulation condition, step S2 is performed,
step S2 is skipped for gray scale data or part of gray scale data which does not meet gray scale modulation conditions;
step S2: modulating gray scale: the gray-scale data to be modulated are represented by the combination of 0 gray scale and preset threshold gray scale, so that the average brightness of the gray-scale data to be modulated is equivalent; the time and/or space positions corresponding to the gray-scale data to be modulated have an adjacent relation;
step S6: according to the gray-scale data without gray-scale modulation or the gray-scale data after gray-scale modulation, obtaining a corresponding output voltage value through a third lookup table or a third conversion function;
step S7:0 gray scale voltage adjustment: judging whether the output voltage value obtained in the step S6 is an output voltage value corresponding to 0 gray scale;
if yes, the voltage is adjusted to be 0 gray scale adjustment voltage value and output, if not, the voltage is directly output;
the 0 gray scale adjustment voltage value is a preset value between the output voltage value corresponding to 0 gray scale and the output voltage value corresponding to 1 gray scale.
2. The method of claim 1, wherein the gray scale modulation conditions are: for a number of adjacent pixels of a number of adjacent frames, the average gray level is below the threshold gray level.
3. The dynamic display smear compensation method according to claim 1, further comprising the steps between step S2 and step S6 of:
step S3: according to the gray-scale data without gray-scale modulation or the gray-scale data after gray-scale modulation, obtaining a voltage drift output value DeltaV of the corresponding current frame through a first lookup table or a first conversion function cur (n), wherein n represents that the current frame is an nth frame;
step S4: calculating a historical accumulated voltage drift output value DeltaV of the current frame according to the voltage drift output values DeltaV of a plurality of frames before the current frame cur (k) Calculated, wherein k represents a kth frame, and k is less than or equal to n;
step S5: brightness compensation: acquiring a corresponding gray-scale data correction value through a second lookup table according to gray-scale data without gray-scale modulation or gray-scale data after gray-scale modulation and the historical accumulated voltage drift output value DeltaV calculated in the step S4;
in step S6, the gray-scale data correction value obtained in step S5 is used to replace the gray-scale data without gray-scale modulation or the gray-scale data after gray-scale modulation.
4. A method for compensating for a smear according to claim 3, wherein the method for calculating the historical accumulated voltage drift output Δv of the current frame in step S4 is iterative calculation.
5. The method of claim 4, wherein the iterative calculation is performed by calculating a historical cumulative voltage drift output value Δv according to formula (1):
ΔV＝ΔV’*(1-α)+ΔV cur (n)*α (1)；
wherein: deltaV' is the historical accumulated voltage drift output value before iterating the current frame, deltaV cur And (n) is a voltage drift output value of the current frame, n represents that the current frame is an nth frame, alpha is a preset proportionality coefficient, and the initial value of the historical accumulated voltage drift output value is 0.
6. The method for compensating for dynamic display smear according to claim 5, further comprising the steps of, after step S4: the historical accumulated voltage drift output value DeltaV is stored in a historical frame information storage unit.
7. The method of claim 3, wherein the first lookup table stores only a voltage drift output value Δv corresponding to a portion of the gray-scale data cur (n) voltage drift output value DeltaV not stored in the first lookup table cur (n) obtained by interpolation;
the second lookup table only stores part of gray-scale data and gray-scale data correction values corresponding to part of historical accumulated voltage drift output values DeltaV, and the gray-scale data correction values not stored in the second lookup table are obtained through interpolation.
8. The method of claim 1, wherein in step S2, the gray-scale data to be modulated is represented by a combination of 0 gray-scale and a threshold gray-scale to make the average brightness of the gray-scale data and the threshold gray-scale data equal to each other, specifically:
the gray-scale data to be modulated are the gray-scale data of a plurality of adjacent pixels;
and setting the gray scale data of the adjacent pixels to be 0 gray scale or threshold gray scale according to a preset pattern or a random pattern, so that the average brightness of the pixels after setting is equivalent to the average brightness corresponding to the gray scale data to be modulated.
9. The method of claim 1, wherein in step S2, the gray-scale data to be modulated is represented by a combination of 0 gray-scale and a threshold gray-scale to make the average brightness of the gray-scale data and the threshold gray-scale data equal to each other, specifically:
the gray-scale data to be modulated are the gray-scale data of a plurality of adjacent frames of single pixels;
and respectively setting the gray scale data of a plurality of adjacent frames of the single pixel to be 0 gray scale or threshold gray scale according to a preset sequence or a random sequence, so that the average brightness of the frames after setting is equivalent to the average brightness corresponding to the gray scale data to be modulated.
10. The method of claim 1, wherein in step S2, the gray-scale data to be modulated is represented by a combination of 0 gray-scale and a threshold gray-scale to make the average brightness of the gray-scale data and the threshold gray-scale data equal to each other, specifically:
the gray-scale data to be modulated are the gray-scale data of a plurality of adjacent frames of a plurality of adjacent pixels;
and respectively setting the gray-scale data of the adjacent frames of the adjacent pixels to be 0 gray scale or threshold gray scale according to a preset pattern and sequence or a random pattern and sequence, so that the average brightness of the frames of the pixels after setting is equivalent to the average brightness corresponding to the gray-scale data to be modulated.
11. A dynamic display smear compensation apparatus, comprising: the device comprises a gray scale modulation module, a gamma conversion module and a 0 gray scale voltage adjustment module;
the gray scale modulation module is used for executing the steps S1 and S2 as claimed in claim 1, and then transmitting gray scale data without gray scale modulation and/or gray scale data after gray scale modulation to the gamma conversion module;
the gamma conversion module is used for executing the step S6 of the claim 1, and is electrically connected with the 0 gray scale voltage adjustment module;
the 0 gray scale voltage adjustment module is configured to execute the step S7 as set forth in claim 1.
12. The dynamic display smear compensation apparatus as claimed in claim 11, further comprising: the system comprises a gray level conversion module, a history frame information superposition module, a history frame information storage unit and a current frame brightness compensation module;
the gray scale modulation module, the gray scale conversion module, the historical frame information superposition module and the current frame brightness compensation module are electrically connected in sequence, the historical frame information superposition module is also electrically connected with the historical frame information storage unit, and the current frame brightness compensation module is electrically connected with the gray scale modulation module and the gamma conversion module respectively;
the gray scale modulation module transmits gray scale data without gray scale modulation and/or gray scale data after gray scale modulation to the gamma conversion module to replace the gray scale data with the gamma conversion module: the gray level modulation module transmits gray level data without gray level modulation and/or gray level data after gray level modulation to the current frame brightness compensation module, and transmits the gray level data to the gamma conversion module after being processed by the current frame brightness compensation module;
the gray level conversion module is configured to perform step S3 of claim 3, the history information superimposing module is configured to perform step S4 of claim 3, the current frame brightness compensation module is configured to perform step S5 of claim 3, and the history frame information storage unit is configured to store data required for calculating the history accumulated voltage drift output value Δv in step S4.
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