CN117672137A - Driving compensation method, driving compensation device and display system - Google Patents
Driving compensation method, driving compensation device and display system Download PDFInfo
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Abstract
The present disclosure provides a driving compensation method, a driving compensation apparatus, and a display system, the driving compensation method including: generating a motion detection signal according to a comparison result of pre-stored previous frame data and current frame data; in the high level state of the motion detection signal, performing table look-up operation according to the previous frame data and the current frame data to obtain a preset frame compensation value of a target position, or in the low level state of the motion detection signal, executing a driving compensation process of continuous multiframes; and then continuing to execute the motion detection of the next frame until the frame number count value reaches the target count value, stopping, and initializing the historical data. Therefore, single-frame or continuous multi-frame compensation can be completed, the motion tailing visual effect is obviously improved, and the power consumption and the cost of a driving chip are not greatly increased.
Description
Technical Field
The disclosure relates to the technical field of display, and in particular relates to a driving compensation method, a driving compensation device and a display system.
Background
Organic light emitting semiconductor (Organic Electroluminescence Display, OLED) screens sometimes encounter motion tailing phenomena in the display, for example, when a finger slides up the mobile phone setup interface, the originally sharp border becomes blurred, the originally round icon becomes flat oval, this phenomenon is more obvious especially in low brightness, and in addition, the different color sub-pixels have differences in light emitting characteristics, these tails tend to be purple/blue, causing problems in visual effect, as shown in fig. 1.
The overdrive compensation technology is generally used in the OLED driving chip to solve the problem of motion tailing, as shown in fig. 2, the basic principle is that: firstly, the data of the previous frame is stored by a buffer, the previous frame is read out when the current frame is processed, then a preset offset compensation value is obtained according to a data lookup table of the previous frame and the current frame, and the offset compensation value is added with the current data to obtain a compensation result.
The existing method can only complete single-frame overdrive compensation. However, when a plurality of frames (for example, more than or equal to 5 frames) are not enough (as shown in fig. 3) under the condition of low brightness, unlike the previous single-frame OD algorithm, the multi-frame OD algorithm needs to be developed, and if the previous algorithm architecture is still used (that is, multi-frame data is continuously stored, as shown in fig. 4), more buffer space is needed, thus resulting in multiple increases of chip cost and power consumption.
Disclosure of Invention
In order to solve the technical problems, the present disclosure provides a driving compensation method, a driving compensation device and a display system, which can complete single-frame or continuous multi-frame compensation, significantly improve motion tailing visual effect, and do not bring about a great increase in power consumption and cost of a driving chip.
In one aspect, the present disclosure provides a driving compensation method, including:
Generating a motion detection signal according to a comparison result of pre-stored previous frame data and current frame data;
in the high level state of the motion detection signal, performing a table look-up operation to obtain a preset frame compensation value of a target position according to the previous frame data and the current frame data, or in the low level state of the motion detection signal, performing a driving compensation process of a continuous multiframe,
the driving compensation process of the continuous multiframe comprises the following steps:
reading a frame number count value and a historical frame compensation value in historical data frame by frame, and updating the frame number count value to be a value after accumulating 1 when the frame number count value does not reach a target count value;
selecting a corresponding attenuation factor according to the mapping relation of the updated frame number count value, and multiplying the attenuation factor by a historical frame compensation value in the historical data to obtain a second frame compensation value of the target position;
updating a frame sequence number count value and a historical frame compensation value in the historical data;
and then, continuously executing the driving compensation motion detection of the next frame until the frame number count value reaches the target count value, stopping, and initializing a historical frame compensation value in the historical data.
In some embodiments, in the high level state of the motion detection signal, the step of performing a table look-up operation to obtain the preset frame compensation value of the target position according to the previous frame data and the current frame data further includes:
and recording a preset frame compensation value of the target position as a first frame compensation value, initializing a frame number count value, and storing the frame number count value and the first frame compensation value as historical data.
In some embodiments, the high level state of the motion detection signal characterizes the previous frame data and the current frame data of the same spatial location as differing by more than a preset safety threshold, and the low level state of the motion detection signal characterizes the previous frame data and the current frame data of the same spatial location as each other, or differing by no more than a preset safety threshold.
In some embodiments, the step of reading the frame number count value and the historical frame offset value in the historical data frame by frame, and updating the frame number count value to a value after accumulating itself by 1 when the frame number count value does not reach the target count value includes:
and when the frame number count value reaches a target count value, updating a historical frame compensation value in the historical data to be zero.
In some embodiments, the step of updating the frame number count value and the historical frame offset value in the historical data comprises:
updating a frame number count value in the history data, and updating the second frame compensation value to the history frame compensation value in a low level state of the motion detection signal;
or updating a frame number count value in the historical data, and keeping the preset frame compensation value constant as the historical frame compensation value.
In some embodiments, the drive compensation method further comprises:
and responding to the motion detection signal, and gating and outputting the first frame compensation value or the second frame compensation value as an actual frame compensation value of the current frame at a target position.
In some embodiments, the drive compensation method further comprises:
and adding the input data of the current frame and an actual frame compensation value obtained by the input data corresponding to the current frame to obtain compensated output data, and transmitting the output data to a display driving chip to drive and control the picture display of a display.
In some embodiments, the drive compensation method further comprises:
and correspondingly providing the input data of the current frame and an actual frame compensation value obtained by the input data corresponding to the current frame to a display driving chip so as to drive and control the image display of a display.
In another aspect, the present disclosure further provides a driving compensation apparatus for overdrive compensating input data of consecutive multiframes, including:
a first frame buffer for storing input data of a frame preceding the current frame;
the motion detection module is respectively connected with the input end of the driving compensation device and the first frame buffer, and is used for generating a motion detection signal according to the comparison result of the previous frame data and the current frame data;
the multi-frame compensation module is used for executing the driving compensation process of continuous multi-frames frame by frame in the low-level state of the motion detection signal until the frame number count value reaches the target count value to stop, and outputting the actual frame compensation value of each frame correspondingly in sequence;
a second frame buffer for updating and storing the preset frame compensation value and the frame number count value as historical data in a first mode, and updating the historical data with the frame number count value and the second frame compensation value updated each time in real time in a second mode,
the first mode is a high level state of the motion detection signal, and the second mode is a low level state of the motion detection signal.
In some embodiments, the driving compensation device stores an overdrive lookup table, an index factor of the overdrive lookup table is a pixel parameter of the previous frame data and the current frame data at a target position, and a corresponding preset frame compensation value is output as the first frame compensation value according to an index result.
In some embodiments, the multi-frame compensation module comprises:
a multi-frame compensation unit for:
reading a frame number count value and a historical frame compensation value in the historical data frame by frame, and updating the frame number count value to be a value after accumulating 1 by itself when the frame number count value does not reach a target count value;
selecting a corresponding attenuation factor according to the mapping relation of the updated frame number count value, and multiplying the attenuation factor by a historical frame compensation value in the historical data to obtain a second frame compensation value of the target position;
updating a frame sequence number count value and a historical frame compensation value in the historical data;
and the selection unit is respectively connected with the first frame compensation value and the second frame compensation value corresponding to the current frame generated by the multi-frame compensation unit at the input end, and is used for gating and outputting one of the first frame compensation value and the second frame compensation value corresponding to the current frame as an actual frame compensation value of the target position in the current frame data according to the state of the motion detection signal.
In some embodiments, the selection unit strobes the first frame compensation value as an actual frame compensation value of a target position in the current frame data in a high level state of the motion detection signal, and strobes the second frame compensation value of the corresponding current frame as an actual frame compensation value of a target position in the current frame data in a low level state of the motion detection signal.
In some embodiments, the multi-frame compensation unit comprises:
the accumulator is used for accumulating the frame number count value and reassigning the accumulated value to the frame number count value;
and the multiplier is used for multiplying the attenuation factor with the historical frame compensation value in the historical data to obtain a second frame compensation value of the target position.
In some embodiments, the drive compensation apparatus further comprises:
and the adder is used for adding and calculating the input data of the current frame and the actual frame compensation value corresponding to the current frame to generate compensated output data.
In another aspect, the present disclosure further provides a display system, including:
a processor;
a drive compensation device as described above in communication with the processor;
And the display is in communication connection with the driving compensation device and is used for displaying images according to the compensated output data.
The beneficial effects of the present disclosure are: the present disclosure proposes a driving compensation method, a driving compensation device, and a display system, wherein the driving compensation method includes: generating a motion detection signal according to a comparison result of pre-stored previous frame data and current frame data; and in a high level state of the motion detection signal, performing a table look-up operation according to the previous frame data and the current frame data to obtain a preset frame compensation value of a target position, or in a low level state of the motion detection signal, performing a driving compensation process of a continuous multi-frame, wherein the driving compensation process of the continuous multi-frame comprises: reading a frame number count value and a historical frame compensation value in historical data frame by frame, and updating the frame number count value to be a value after accumulating 1 when the frame number count value does not reach a target count value; selecting a corresponding attenuation factor according to the mapping relation of the updated frame number count value, and multiplying the attenuation factor by a historical frame compensation value in the historical data to obtain a second frame compensation value of the target position; and updating the frame number count value and the historical frame compensation value in the historical data, and then continuously executing the driving compensation process of the continuous multi-frame of the next frame until the frame number count value reaches the target count value to stop, and initializing the historical frame compensation value in the historical data. Therefore, on the basis of the single-frame overdrive compensation technology based on the existing scheme, the compensation effect on continuous multiframes is realized only by adding one buffer, and when the continuous multiframe compensation is completed, the motion tailing visual effect is obviously improved, the chip area and the power consumption are greatly saved, and the method has higher practical value.
Of course, the technical scheme disclosed by the invention can be suitable for a display scene with higher refresh rate, and solves the problem of image smear caused by insufficient response due to insufficient overdrive compensation; the display device is also suitable for a display scene with a low refresh rate, and the phenomenon of color distortion is caused due to too fast response caused by excessive overdrive compensation, so that the picture display effect is improved under the condition of saving the chip area and the power consumption, and the visual experience of a user is greatly improved.
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The above and other objects, features and advantages of the present disclosure will become more apparent from the following description of the embodiments of the present disclosure with reference to the accompanying drawings.
FIG. 1 is a schematic gray scale diagram showing that the brightness of a single frame is not reached under the condition of low brightness in the prior art;
FIG. 2 is a schematic diagram of a prior art single frame overdrive compensation process;
FIG. 3 is a schematic diagram of gray scale with continuous multi-frame luminance not achieved under low luminance condition in the prior art;
FIG. 4 is a schematic diagram of a prior art multi-frame overdrive compensation process;
FIG. 5 shows a schematic diagram of a driving compensation device provided by an embodiment of the present disclosure;
FIGS. 6a and 6b are schematic diagrams illustrating two embodiments of the drive compensation apparatus of FIG. 5, respectively, when performing multi-frame overdrive compensation;
FIGS. 7a and 7b are schematic diagrams illustrating the drive compensation device during overdrive compensation in an embodiment of the present disclosure;
FIG. 8a is a schematic flow chart of a driving compensation method according to an embodiment of the disclosure;
FIG. 8b is a flow chart showing the sub-steps of step S130 in the drive compensation method of FIG. 8 a;
FIG. 9 is a schematic diagram showing the implementation of the driving compensation method shown in FIG. 8a in an implementation scenario;
fig. 10 illustrates a schematic structural diagram of a display system provided in an embodiment of the present disclosure.
Detailed Description
In order that the disclosure may be understood, a more complete description of the disclosure will be rendered by reference to the appended drawings. Preferred embodiments of the present disclosure are shown in the drawings. This disclosure may, however, be embodied in different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used in the description of the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure.
The problem of motion tailing visual effect has been present in the visual display of high frequency display devices, whether liquid crystal or OLED displays, and especially in live motion live display scenes, and improving this problem is a challenge faced at present.
Taking a liquid crystal display as an example, the display principle of the existing liquid crystal display is based on that different voltages are used for driving the liquid crystal to turn over so as to realize different light transmission amounts, and the light transmitted through the liquid crystal is emitted out of the liquid crystal display through a color filter, so that the display presents colors with different brightness. Because of the viscosity and elasticity of the liquid crystal itself, the time for the liquid crystal to flip from one state to another is not instantaneous, i.e., when the liquid crystal has flipped from the previous state to the current target state, the optical response of the liquid crystal reaches the desired target state after a period of time, i.e., the response time, even though the corresponding voltage has been applied. Because of the capacitance between the TFT crystals when the TFT crystals are turned on and off, the response speed of the liquid crystal is delayed, and the phenomenon of blurring of a trailing image occurs when a fast moving picture is played.
Since the moment generated by the liquid crystal molecules in the electric field is proportional to the square of the electric field, increasing the electric field can greatly increase the moment applied to the liquid crystal molecules, thereby accelerating the rotation of the liquid crystal molecules. The specific measures are as follows: one frame is added between two frames, and a higher compensation voltage is applied to force liquid crystal molecules to change arrangement in a shorter time, so that the response time of the liquid crystal is improved from low-brightness gray level to preset high-brightness gray level, and the method is called high-interpolation driving, also called overdrive or overshoot OD. The liquid crystal molecules are enabled to rotate faster by applying the initial voltage which is slightly higher or lower than the corresponding voltage of the state to the liquid crystal molecules, and after the liquid crystal molecules reach the state, the voltage falls back to the corresponding voltage of the state to keep the state, so that the response speed of the liquid crystal display can be improved, and the response time of different gray scales becomes more average.
However, when the refresh rate of the display of the user is relatively high and the variation range of the refresh rate is relatively large, the overdrive compensation is performed on the liquid crystal display by using the conventional method, and under the condition of high refresh rate, insufficient response is caused due to insufficient overdrive compensation, so that the phenomenon of image smear is caused. In practice, when a plurality of continuous frames (for example, more than or equal to 5 frames) of brightness of a display panel are not enough under the condition of low brightness, unlike the prior single-frame OD algorithm, a multi-frame OD algorithm needs to be developed, and if the prior algorithm architecture is still used, the number of buffers and the space need to be increased, so that the cost of a chip is increased and the power consumption is increased.
The present disclosure is described in detail below with reference to the accompanying drawings.
Fig. 5 is a schematic diagram illustrating a structure of a driving compensation device according to an embodiment of the present disclosure, and fig. 6a and 6b are schematic diagrams illustrating two implementations of the driving compensation device shown in fig. 5 when performing multi-frame overdrive compensation, respectively.
The disclosed embodiments provide a driving compensation apparatus 100, the driving compensation apparatus 100 is used for overdrive compensation of input data of consecutive multiframes, and referring to fig. 5, the driving compensation apparatus 100 may include: a first frame buffer 110, a second frame buffer 120, an overdrive lookup table 130, a multi-frame compensation module 140, and a motion detection module 150.
Wherein, the first frame buffer 110 is used for storing input data of a frame before the current frame;
the motion detection module 150 is respectively connected to the input end of the driving compensation device 100 and the first frame buffer 110, and the motion detection module 150 is configured to generate a motion detection signal md_flag according to a comparison result of the previous frame data and the current frame data;
the multi-frame compensation module 140 is configured to perform a driving compensation process of consecutive multi-frames frame by frame in the low level state of the motion detection signal md_flag until the frame number count index reaches a target count N (the target count is the number of frames for determining to perform the consecutive multi-frame overdrive compensation, such as N, the same applies below) and sequentially output an actual frame compensation value offset_0 of each frame;
the second frame buffer 120 is configured to update and store a preset frame offset value offset_s as the first frame offset value and a frame number count value index as historical data { index ', offset ' } (wherein the offset ' and offset are both historical frame offset values in the historical data, the former representing updated values, the latter representing constant values, the latter being the same), in a first mode, which is a high level state of the motion detection signal md_flag, such as 1, and update the frame number count value index and the second frame offset value offset_m, which are updated each time, as the historical data { index, offset }, in real time in a second mode, which is a low level state of the motion detection signal md_flag, such as 0. Further, the difference between the previous frame data and the current frame data, which represent the same spatial position, of the high level state of the motion detection signal exceeds a preset safety threshold, and the difference between the previous frame data and the current frame data, which represent the same spatial position, of the low level state of the motion detection signal does not exceed the preset safety threshold, and the preset safety threshold can be set according to parameters such as resolution, refresh frequency and the like of a display, can also be adjusted according to the display quality of a picture, and is not limited herein.
Meanwhile, it should be noted that, the "first frame compensation value" and the "second frame compensation value" in the foregoing and the following descriptions are not defined corresponding to serial numbers of consecutive frames, but are defined corresponding to the reference distinction of compensation amounts obtained by different times or different operations of the "frame compensation value", and are described by the first and the second frames only, rather than the arrangement sequence of the serial numbers of the frames.
It should be understood that 1 and 0 refer to the level state of the motion detection signal md_flag, in an alternative embodiment, the low level state of the motion detection signal md_flag may be 1, the high level state may be 0, and similarly, the first mode may be the low level state of the motion detection signal md_flag, and the second mode may be the high level state of the motion detection signal md_flag, which is not limited herein.
In some embodiments, the driving compensation device 100 stores an overdrive lookup table 130, an index factor of the overdrive lookup table 130 is a pixel parameter of the previous frame data and the current frame data at a target position, and outputs a corresponding preset frame compensation value offset_s according to an index result, and uses the preset frame compensation value offset_s as the first frame compensation value. The target position may be a plurality of preset feature positions, so as to obtain the comparison result of the current frame data and the previous frame data more quickly.
In some embodiments, the multi-frame compensation module 140 includes: a multi-frame compensation unit 141 and a selection unit 142.
Wherein, referring to fig. 5, the multi-frame compensation unit 141 is configured to perform:
reading a frame number count value index and a historical frame compensation value offset in the historical data frame by frame, and updating the frame number count value index to a value after accumulating 1 when the frame number count value index does not reach a target count value N;
selecting a corresponding attenuation factor S according to the mapping relation of the updated frame number count value index, and multiplying the attenuation factor S with a historical frame compensation value offset in the historical data to obtain a second frame compensation value offset_m of the target position;
updating a frame sequence number count value index and a historical frame offset value offset in the historical data;
the input terminal of the selecting unit 142 is respectively connected to the first frame compensation value offset_s and the second frame compensation value offset_m corresponding to the current frame generated by the multi-frame compensating unit 141, and is configured to gate and output one of the first frame compensation value offset_s and the second frame compensation value offset_m corresponding to the current frame as an actual frame compensation value offset_0 of the target position in the current frame data according to the state of the motion detection signal md_flag.
In some embodiments, the selection unit 142 gates out the first frame compensation value offset_s as an actual frame compensation value offset_0 of a target position in the current frame data, i.e., the actual frame compensation value offset_0=offset_s, in the high level state 1 of the motion detection signal md_flag, and gates out the second frame compensation value offset_m of the corresponding current frame as an actual frame compensation value offset_0 of a target position in the current frame data, i.e., the actual frame compensation value offset_0=offset_m, in the low level state of the motion detection signal md_flag, as shown in fig. 6a and 6 b.
In some embodiments, in conjunction with fig. 5 and fig. 6a and fig. 6b, the multi-frame compensation unit 141 includes: an accumulator and a multiplier are provided to the output of the accumulator,
the accumulator is used for accumulating the frame number count value index to calculate index '=index+1, and re-endowing the accumulated value index' with the frame number count value index;
the multiplier is configured to multiply the attenuation factor S with a historical frame offset value offset in the historical data to obtain a second frame offset value offset_m of the target position, as shown in fig. 6a, where in this embodiment, the historical frame offset value offset is the second frame offset value offset_m after performing the attenuation operation according to the first frame offset value offset_s of the previous frame data.
In another embodiment, only the frame number count index' in the history data is updated, and the preset frame compensation value (i.e. the first frame compensation value) offset_s corresponding to the initial motion frame is constant as the history frame compensation value offset, and is not updated. Thus, in the overdrive compensation of consecutive frames, it is only necessary to read the frame number count value and the first frame compensation value offset_s of the original motion frame from the second frame buffer 120, i.e., { index, offset }, and write only the new frame number count value, i.e., { index', offset }, when writing. Correspondingly, the multiplier is configured to multiply the attenuation factor S with a historical frame compensation value offset (i.e., a preset frame compensation value offset_s corresponding to an initial motion frame) in the historical data to obtain a second frame compensation value offset_m of the target position, as shown in fig. 6 b. Therefore, the data bit width and power consumption of the write buffer can be further saved by performing the attenuation calculation only by making the attenuation factor S mapping table corresponding to the embodiment of fig. 6a on the basis of the fixed historical frame compensation value offset.
In some embodiments, as shown in fig. 5, the driving compensation device 100 further includes: and an adder 160, wherein the adder 160 is configured to add and calculate input data of a current frame and an actual frame compensation value offset_0 corresponding to the current frame, and generate compensated output data.
Fig. 7a and 7b are schematic diagrams illustrating the driving compensation device in the overdrive compensation according to the embodiment of the present disclosure. Referring to fig. 7a, (T-1), (T), …, (t+3), … are time points, corresponding a (T-1), a (T), …, a (t+3), … are image frames corresponding to time points, wherein a dotted line frame represents a history data frame and a solid line frame is a current data frame or a data frame to be input. When the current data frame is a (T), the current frame data is Da (T), the data of the previous frame a (T-1) located in the current frame is Da (T-1), which is already stored in the first frame buffer 110, wherein the target position changes from the previous frame (white point) to the current frame (black point), that is, the motion occurs, the single frame compensation is performed, firstly, the preset frame compensation value offset_s of the target position is obtained through the index of the lookup table and is used as the first frame compensation value, the preset frame compensation value offset_s is selected as the actual frame compensation value offset_0 of the target position in the current frame data according to the state of the motion detection signal md_flag, the added and calculated with the input data of the current frame, the output data after the supplement is obtained, meanwhile, the frame number count value index=0 is obtained, at this time, the preset frame compensation value offset_s of the target position is used as the historical frame compensation value, and the frame number count value index is updated to the second frame buffer 120 as the historical data.
Referring to fig. 7b, taking a (t+1) as a current frame, taking a (T) as a previous frame of the current frame, storing frame data Da (T) in a first frame buffer 110, comparing pixel data (all black points) of the current frame a (t+1) and the previous frame a (T) at a target position, finding that the data values are the same, indicating that no motion occurs, performing multi-frame overdrive compensation on the current frame and the subsequent frame, at this time, retrieving historical data in a second frame buffer 120, judging that a frame number count value index=0 does not reach a target count value N, firstly accumulating the frame number count value index to calculate index ' =1, then selecting a corresponding attenuation factor S according to a mapping relation of the frame number count value index, multiplying the attenuation factor S with a historical frame compensation value offset m in the historical data to obtain a second frame compensation value offset_m of a target position, outputting the second frame compensation value offset_m of the corresponding current frame as a low level state 0 of the motion detection signal md_flag, and performing the motion compensation on the second frame compensation value offset m in the historical frame compensation value offset_m as the target position in the historical frame buffer data, and then performing the historical compensation value N ' when the corresponding to the historical frame number count value index N is greater than the current frame number index N, and the historical frame number N is detected to be equal to the historical frame offset value N ' and the historical frame compensation value N is detected, and the historical frame offset value N is detected to be greater than the historical frame offset value N in the historical frame compensation value N, and the historical frame compensation value offset value is detected when the historical value N is greater than the historical frame offset value N.
In another embodiment, the frame number count value index' in the history data may also be updated, and the first frame offset value offset_s may be constant as the history frame offset value offset. In the overdrive compensation of consecutive frames, it is only necessary to read the frame number count value and the preset frame compensation value offset_s of the original motion frame from the second frame buffer 120 each time { index, offset }, and write only the new frame number count value { index', offset }. Therefore, the attenuation calculation is performed by making the attenuation factor S mapping table corresponding to the different embodiments on the basis of the fixed historical frame compensation value offset, so that the data bit width and the power consumption of the write buffer can be further saved.
In this embodiment, the actual frame compensation value offset_0 characterizes that, in a low-brightness display scene, when the brightness of a continuous multi-frame does not reach an expected value, the gain value of the brightness control parameter of the continuous multi-frame, such as a gray-scale voltage, can be changed or enhanced, after motion is detected, a gain gray-scale voltage value obtained by calculation according to a table lookup is added to a gray-scale voltage value of a previous frame, which is hopped from the gray-scale voltage value of a current frame, so that the display brightness of a picture of the current frame is enabled to reach the standard rapidly, the response time is shortened, the display effect is improved, and the overdrive compensation effect of the continuous multi-frame in the display scene with a high refresh rate is further ensured.
Because dynamic smear on an image picture is more frequently generated when pixel data corresponding to pixels is low gray scale value, when the pixel data of the display is low gray scale value, the display adopts a multi-frame overdrive technology, so that power consumption can be saved.
Therefore, on the basis of the single-frame overdrive compensation technology based on the existing scheme, the drive compensation device in the embodiment of the disclosure realizes the compensation effect on continuous multiframes only by adding one buffer, and greatly saves the chip area and the power consumption while completing the continuous multiframe compensation and obviously improving the motion tailing visual effect, thereby having higher practical value.
In addition, the driving compensation device provided in the embodiment of the present disclosure may be applied to an OLED display system, an LCD display system, or other display systems of display types, which is not limited herein, and aims to solve the problem of motion tailing visual effect.
Fig. 8a is a schematic flow chart of a driving compensation method according to an embodiment of the present disclosure, fig. 8b is a schematic flow chart of a sub-step of step S130 in the driving compensation method shown in fig. 8a, and fig. 9 is a schematic flow chart of an implementation process of the driving compensation method shown in fig. 8a in an implementation scenario.
Based on the same inventive concept, the embodiments of the present disclosure further provide a driving compensation method, referring to fig. 8a and 8b, wherein the driving compensation method includes:
s110: and generating a motion detection signal according to a comparison result of the pre-stored previous frame data and the current frame data.
S120: and in the high level state of the motion detection signal, performing table look-up operation according to the previous frame data and the current frame data to obtain a preset frame compensation value of a target position, or in the low level state of the motion detection signal, executing a driving compensation process of continuous multiframes.
S130: and continuing to execute the driving compensation motion detection of the next frame until the frame number count value reaches the target count value, and initializing a historical frame compensation value in the historical data.
In some embodiments, in step S110, in the high level state of the motion detection signal, the step of performing the table look-up operation to obtain the preset frame compensation value of the target position according to the previous frame data and the current frame data further includes: and recording a preset frame compensation value of the target position as a first frame compensation value, initializing a frame number count value, and storing the frame number count value and the first frame compensation value as historical data.
In some embodiments, the difference between the previous frame data and the current frame data of the same spatial position is more than a preset safety threshold, and the difference between the previous frame data and the current frame data of the same spatial position is not more than a preset safety threshold, where the preset safety threshold may be set according to parameters such as resolution and refresh frequency of the display, and may be adjusted according to the quality of the image display, which is not limited herein.
In step S130, the step of performing the driving compensation process of the consecutive multiframes may include:
s131: and reading a frame number count value and a historical frame compensation value in the historical data frame by frame, and updating the frame number count value to be a value after accumulating 1 by itself when the frame number count value does not reach a target count value.
S132: and selecting a corresponding attenuation factor according to the mapping relation of the updated frame number count value, and multiplying the attenuation factor by a historical frame compensation value in the historical data to obtain a second frame compensation value of the target position.
S133: and updating a frame sequence number count value and a historical frame compensation value in the historical data.
In some embodiments, in step S131, the step of reading the frame number count value and the historical frame offset value in the historical data frame by frame, and when the frame number count value does not reach the target count value, updating the frame number count value to a value after accumulating 1 by itself may further include:
and when the frame number count value reaches a target count value, updating a historical frame compensation value in the historical data to be zero.
In some embodiments, in step S133, the step of updating the frame number count value and the historical frame offset value in the historical data may further include: updating a frame number count value in the history data, and updating the second frame compensation value to the history frame compensation value in a low level state of the motion detection signal.
In other embodiments, in step S133, the step of updating the frame number count value and the historical frame offset value in the historical data may further include: updating a frame number count value in the history data, and keeping the first frame compensation value constant as the history frame compensation value. In the overdrive compensation of continuous multi-frame, the frame number count value and the first frame compensation value (preset frame compensation value) of the initial motion frame are read from the second frame buffer each time, and only the new frame number count value is written during writing, so that the attenuation calculation is performed by making the attenuation factor mapping table corresponding to different embodiments on the basis of the fixed first frame compensation value, and the data bit width and the power consumption of writing into the buffer can be further saved.
When the driving compensation method provided in the present embodiment shown in fig. 8a is applied to the driving compensation apparatus 100 provided in the present embodiment shown in fig. 5, a block diagram of a specific implementation thereof is shown in fig. 9, when processing current frame data, previous frame data is read from the first frame buffer 110, the previous frame data is compared with the current frame data, whether motion occurs is detected, and a motion detection signal md_flag is generated according to the comparison result, and if motion is detected, that is, when the motion detection signal md_flag is in a high level state 1, single frame overdrive compensation is performed: performing table lookup (overdrive lookup table 130) operation on the previous first frame data and the current frame data to obtain a preset frame compensation value offset_s of a target position, adding the preset frame compensation value offset_s as an actual frame compensation value offset_0 to the current frame input data to obtain overdrive compensated output data, and updating and storing a frame sequence number count value index and the first frame compensation value offset_s as historical data { index ', offset' } in the second frame buffer 120 in the process; if no motion is detected, i.e., the motion detection signal md_flag is in a low level state 0, the target position is executed to read out the history data { index, offset } of the corresponding position from the second frame buffer 120, check whether the frame number count index thereof is smaller than the target count N, and if smaller than N, increment the frame number count index by 1; otherwise, the historical frame compensation value offset in the corresponding position historical data of the second frame buffer 120 is initialized to 0, i.e., { index, offset = { N,0}, where the target count value N is the number of frames for determining to perform consecutive multi-frame overdrive compensation, and then the step of updating the historical data of the second frame buffer 120 to { index ', offset' } is performed.
After accumulating the frame number count index by 1, the multi-frame compensation module 140 performs overdrive compensation for consecutive multi-frames: reading a frame number count value index and a historical frame compensation value offset in the historical data frame by frame, selecting a corresponding attenuation factor S according to the mapping relation of the updated frame number count value index, multiplying the attenuation factor S by the historical frame compensation value offset in the historical data to obtain a second frame compensation value offset_m of a target position, and then gating and outputting the second frame compensation value offset_m as an actual frame compensation value offset_0, and adding the actual frame compensation value offset_0 with the current frame input data to obtain output data after overdrive compensation; then, the frame number count index and the history frame offset value offset in the history data are updated, i.e., the history data of the second frame buffer 120 is updated to { index ', offset' }.
And stopping the frame number count value until the frame number count value reaches the target count value, initializing the historical data, and adding the current frame input data and the corresponding actual frame compensation value offset_0 to obtain compensated output data.
In some embodiments, the drive compensation method further comprises:
and adding the input data of the current frame and an actual frame compensation value offset_0 obtained by the input data corresponding to the current frame to obtain compensated output data, and transmitting the output data to a display driving chip to drive and control the picture display of a display.
In other embodiments, the drive compensation method further comprises:
and correspondingly providing the input data of the current frame and an actual frame compensation value offset_0 obtained by the input data corresponding to the current frame to a display driving chip so as to drive and control the image display of a display.
In this embodiment, the output data after overdrive compensation is provided to the display driving chip, and of course, in other embodiments, the actual frame compensation value offset_0 of each frame may be sequentially transmitted separately according to the time sequence of the input data of the continuous multiframe, so that the driving compensation method can be implemented by using the structure of only adding the second frame buffer in the driving compensation device of this embodiment of the disclosure, so as to realize the effect of overdrive compensation of the continuous multiframe, and the power consumption and cost of the driving IC will not be greatly increased while the visual effect of motion tailing is significantly improved.
Based on the same inventive concept, the disclosed embodiments also provide a display system, as shown in fig. 10, the display system 10 includes a processor 200, a driving compensation device 100, and a display 300, wherein the driving compensation device 100 is communicatively connected with the processor 200; the display 300 is communicatively connected to the drive compensation apparatus 100 for displaying images.
The driving compensation device 100 may be connected to the processor 200 through an eDP interface supporting an eDP protocol, and the driving compensation device 100 receives video image data output from the processor (CPU/GPU) 200 through the eDP interface. The display 300 has a display driving chip, which can receive the processed video image data outputted from the driving compensation device 100 according to the CEDS protocol, and convert the processed video image data into driving signals (gate line scanning signals and source data signals) of the display, so that the display screen can display correct images.
The display driving chip comprises a source driving circuit and a Gate driving circuit (Gate Driver IC) which are arranged on the display panel, wherein the Gate driving circuit is electrically connected with Gate lines on the display panel and is used for sequentially providing line scanning driving voltages for the Gate lines. The general procedure for driving a certain pixel cell by using a gate driving circuit and a source driving circuit is as follows: the grid driving circuit provides a line scanning driving voltage for grid lines connected with the pixel units so as to control the on of the thin film transistors in the pixel units; the source electrode driving circuit provides a target overdrive gray-scale voltage signal for a data line connected with the pixel unit, and the thin film transistor in the pixel unit charges the pixel electrode according to the received target overdrive gray-scale voltage signal, so that the pixel electrode is loaded with a desired gray-scale voltage, and the pixel unit can display corresponding gray-scale brightness.
In some embodiments, the timing controller includes the driving compensation device 100 described above, and the timing controller (Tcon IC) is electrically connected to the source driving circuit and the gate driving circuit, and is used to control the source driving circuit and the gate driving circuit to operate; the timing controller belongs to a conventional structure in the display driving device, and specific circuit structure and working process are not repeated here.
Of course, the timing controller may also include a memory module; that is, the driving compensation device 100 and the memory module may be integrated in the timing controller, so that the timing controller has a function of performing the overdrive compensation process on the pixel unit.
It will be appreciated by those skilled in the art that the modules or steps of the invention described above may be implemented in a general purpose computing device, they may be concentrated on a single computing device, or distributed across a network of computing devices, they may be implemented in program code executable by computing devices, so that they may be stored in a storage device for execution by computing devices, and in some cases, the steps shown or described may be performed in a different order than that shown or described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple modules or steps of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device.
From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects: in the driving compensation method, the driving compensation device and the display system provided by the disclosure, the driving compensation method comprises the following steps: according to the acquired previous frame data and current frame data, performing table look-up operation to obtain a preset frame compensation value of the target position; recording a preset frame compensation value of a target position as a first frame compensation value, initializing a frame number count value, and storing the frame number count value and the first preset compensation value as historical data; performing a drive compensation process for successive multiframes: reading a frame number count value and a historical frame compensation value in the historical data frame by frame, and updating the frame number count value to be a value after accumulating 1 by itself when the frame number count value does not reach a target count value; selecting a corresponding attenuation factor according to the mapping relation of the updated frame number count value, and multiplying the attenuation factor by a historical frame compensation value in the historical data to obtain a second frame compensation value of the target position; and updating a frame number count value and a historical frame compensation value in the historical data, and then continuously executing a driving compensation process of a continuous multi-frame of the next frame until the frame number count value reaches a target count value to stop, and initializing the historical data. Therefore, on the basis of the single-frame overdrive compensation technology based on the existing scheme, the compensation effect on continuous multiframes is realized only by adding one buffer, and when the continuous multiframe compensation is completed, the motion tailing visual effect is obviously improved, the chip area and the power consumption are greatly saved, and the method has higher practical value.
Of course, the technical scheme disclosed by the invention can be suitable for a display scene with higher refresh rate, and solves the problem of image smear caused by insufficient response due to insufficient overdrive compensation; the display device is also suitable for a display scene with a low refresh rate, and the phenomenon of color distortion is caused due to too fast response caused by excessive overdrive compensation, so that the picture display effect is improved under the condition of saving the chip area and the power consumption, and the visual experience of a user is greatly improved.
It should be noted that in the description of the present disclosure, it should be understood that the terms "upper," "lower," "inner," and the like indicate an orientation or a positional relationship, and are merely for convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present disclosure.
Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it is apparent that the above examples are merely illustrative of the present disclosure and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present disclosure.
Claims (15)
1. A drive compensation method, comprising:
generating a motion detection signal according to a comparison result of pre-stored previous frame data and current frame data;
and in a high level state of the motion detection signal, performing a table look-up operation according to the previous frame data and the current frame data to obtain a preset frame compensation value of a target position, or in a low level state of the motion detection signal, performing a driving compensation process of a continuous multi-frame, wherein the driving compensation process of the continuous multi-frame comprises:
reading a frame number count value and a historical frame compensation value in historical data frame by frame, and updating the frame number count value to be a value after accumulating 1 when the frame number count value does not reach a target count value;
Selecting a corresponding attenuation factor according to the mapping relation of the updated frame number count value, and multiplying the attenuation factor by a historical frame compensation value in the historical data to obtain a second frame compensation value of the target position;
updating a frame sequence number count value and a historical frame compensation value in the historical data;
and then continuing to execute motion detection of the next frame until the frame number count value reaches the target count value, stopping, and initializing a historical frame compensation value in the historical data.
2. The driving compensation method according to claim 1, wherein the step of performing a table look-up operation to obtain the preset frame compensation value of the target position according to the previous frame data and the current frame data in the high level state of the motion detection signal further comprises:
and recording a preset frame compensation value of the target position as a first frame compensation value, initializing a frame number count value, and storing the frame number count value and the first frame compensation value as historical data.
3. The drive compensation method of claim 1, wherein a high level state of the motion detection signal indicates that a difference between the previous frame data and the current frame data at the same spatial location exceeds a preset safety threshold, and a low level state of the motion detection signal indicates that the previous frame data and the current frame data at the same spatial location are the same, or a difference therebetween does not exceed a preset safety threshold.
4. The drive compensation method according to claim 1, wherein the step of reading the frame number count value and the history frame compensation value in the history data frame by frame, and updating the frame number count value to a value obtained by accumulating itself by 1 when the frame number count value does not reach a target count value, comprises:
and when the frame number count value reaches a target count value, updating a historical frame compensation value in the historical data to be zero.
5. The drive compensation method of claim 1, wherein the step of updating the frame number count value and the historical frame compensation value in the historical data comprises:
updating a frame number count value in the history data, and updating the second frame compensation value to the history frame compensation value in a low level state of the motion detection signal;
or updating a frame number count value in the historical data, and keeping the preset frame compensation value constant as the historical frame compensation value.
6. The drive compensation method of claim 5, further comprising:
and responding to the motion detection signal, and gating and outputting the first frame compensation value or the second frame compensation value as an actual frame compensation value of the current frame at a target position.
7. The drive compensation method of claim 6, further comprising:
and adding the input data of the current frame and an actual frame compensation value obtained by the input data corresponding to the current frame to obtain compensated output data, and transmitting the output data to a display driving chip to drive and control the picture display of a display.
8. The drive compensation method of claim 6, further comprising:
and correspondingly providing the input data of the current frame and an actual frame compensation value obtained by the input data corresponding to the current frame to a display driving chip so as to drive and control the image display of a display.
9. A drive compensation apparatus for overdrive compensating input data of successive multiframes, comprising:
a first frame buffer for storing input data of a frame preceding the current frame;
the motion detection module is respectively connected with the input end of the driving compensation device and the first frame buffer, and is used for generating a motion detection signal according to the comparison result of the previous frame data and the current frame data;
the multi-frame compensation module is used for executing the driving compensation process of continuous multi-frames frame by frame in the low-level state of the motion detection signal until the frame number count value reaches the target count value to stop, and outputting the actual frame compensation value of each frame correspondingly in sequence;
A second frame buffer for updating and storing the preset frame compensation value as a first frame compensation value and the frame number count value as history data in a first mode, and updating the frame number count value and the second frame compensation value updated each time in real time in a second mode,
the first mode is a high level state of the motion detection signal, and the second mode is a low level state of the motion detection signal.
10. The drive compensation device according to claim 9, wherein the drive compensation device stores an overdrive lookup table, an index factor of the overdrive lookup table is a pixel parameter of the previous frame data and the current frame data at a target position, and a corresponding preset frame compensation value is output as the first frame compensation value according to an index result.
11. The drive compensation apparatus of claim 9, wherein the multi-frame compensation module comprises:
a multi-frame compensation unit for:
reading a frame number count value and a historical frame compensation value in the historical data frame by frame, and updating the frame number count value to be a value after accumulating 1 by itself when the frame number count value does not reach a target count value;
Selecting a corresponding attenuation factor according to the mapping relation of the updated frame number count value, and multiplying the attenuation factor by a historical frame compensation value in the historical data to obtain a second frame compensation value of the target position;
updating a frame sequence number count value and a historical frame compensation value in the historical data;
and the selection unit is respectively connected with the first frame compensation value and the second frame compensation value corresponding to the current frame generated by the multi-frame compensation unit at the input end, and is used for gating and outputting one of the first frame compensation value and the second frame compensation value corresponding to the current frame as an actual frame compensation value of the target position in the current frame data according to the state of the motion detection signal.
12. The drive compensation apparatus according to claim 11, wherein the selection unit gates out the first frame compensation value as an actual frame compensation value of a target position in current frame data in a high-level state of the motion detection signal, and gates out the second frame compensation value as an actual frame compensation value of a target position in current frame data in a low-level state of the motion detection signal.
13. The drive compensation apparatus of claim 11, wherein the multi-frame compensation unit comprises:
The accumulator is used for accumulating the frame number count value and reassigning the accumulated value to the frame number count value;
and the multiplier is used for multiplying the attenuation factor with the historical frame compensation value in the historical data to obtain a second frame compensation value of the target position.
14. The drive compensation device according to claim 11, further comprising:
and the adder is used for adding and calculating the input data of the current frame and the actual frame compensation value corresponding to the current frame to generate compensated output data.
15. A display system, comprising:
a processor;
the drive compensation apparatus of any one of claims 9-14, in communication with the processor;
and the display is in communication connection with the driving compensation device and is used for displaying images according to the compensated output data.
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