CN111710313B - Method and device for eliminating water ripples of display panel and display device - Google Patents
Method and device for eliminating water ripples of display panel and display device Download PDFInfo
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- CN111710313B CN111710313B CN202010674336.1A CN202010674336A CN111710313B CN 111710313 B CN111710313 B CN 111710313B CN 202010674336 A CN202010674336 A CN 202010674336A CN 111710313 B CN111710313 B CN 111710313B
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- 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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
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Abstract
The invention provides a method and a device for eliminating water ripples of a display panel and a display device, wherein the method for eliminating the water ripples of the display panel comprises the following steps: acquiring the modulation frequency and the modulation amplitude of spread spectrum, and calculating the modulation period T of the spread spectrum according to the modulation frequency of the spread spectrum; discretizing the modulation amplitude in one modulation period of the spread spectrum to obtain N discretization modulation amplitude values, wherein N is a positive integer; under the condition of receiving a frame start signal, generating N different addresses, and randomly allocating the N addresses as storage addresses of the N discrete modulation amplitude values; and sequentially reading and outputting the discretization modulation amplitude values according to the sequence of the N addresses. According to the elimination method provided by the embodiment of the invention, the electromagnetic interference requirement of the display device is met, and meanwhile, the modulation amplitude is discretized and converted into the disordered spread spectrum amplitude value for outputting, so that the pixel charging rate Jitter value can be randomly changed, and the water ripple phenomenon of the display panel is eliminated.
Description
Technical Field
The invention relates to the technical field of display, in particular to a method and a device for eliminating water ripples of a display panel and a display device.
Background
With the development of display industry technology, large size and high resolution are becoming the standard configuration of display. However, due to the large size and high resolution of the display panel, the charging time of a single pixel is very short (under the condition of 60Hz, the charging time of 4K products is less than 7.4 mus, and the charging time of 8K products is less than 3.7 mus), so that the charging rate is seriously insufficient.
Meanwhile, due to the fact that the client side has electromagnetic interference requirements and panel electromagnetic interference cannot be too large, a spread spectrum concept is introduced, even if square waves such as CLK/Sout shake back and forth within a certain range, electromagnetic interference is weakened. Meanwhile, if the charging rate of the display panel is seriously insufficient, when the square wave shakes back and forth, the charging rate Jitter value of the pixel is influenced, the difference of the charging rate Jitter value can cause slight brightness difference in the plane, the spread spectrum amplitude changes according to a certain frequency, when the change frequency of the Jitter value is not matched with the refreshing frequency of the panel, the brightness change of the horizontal direction rule of the panel can occur, namely, the horizontal rolling water ripple, and the direct reason for the water ripple occurs is that the charging rate Jitter value changes regularly.
In the future, the display industry will put forward higher resolution and frame rate requirements on the display panel, and the rolling water ripple phenomenon will exist all the time because the real panel has further requirements on the charging rate.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for eliminating water ripples of a display panel, and a display apparatus, which can solve the problem of water ripples generated in the display panel due to the spread spectrum technique in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
an embodiment of an aspect of the present invention provides a method for eliminating water ripples of a display panel, including:
acquiring the modulation frequency and the modulation amplitude of spread spectrum, and calculating the modulation period T of the spread spectrum according to the modulation frequency of the spread spectrum;
discretizing the modulation amplitude in one modulation period of the spread spectrum to obtain N discretized modulation amplitude values, wherein N is a positive integer;
under the condition of receiving a frame start signal, generating N different addresses, and randomly allocating the N addresses as storage addresses of the N discrete modulation amplitude values;
and sequentially reading and outputting the discretization modulation amplitude values according to the sequence of the N addresses.
Optionally, the discretizing the modulation amplitude in one modulation period of the spread spectrum to obtain N discretized modulation amplitude values includes:
and dividing one modulation period T of the spread spectrum into N period points at the time interval of T/N, and acquiring the frequency modulation amplitude value corresponding to each period point to obtain N discretization modulation amplitude values.
Optionally, after the step of sequentially reading and outputting the discretization modulation amplitude value according to the sequence of the N addresses, the method further includes:
and continuously generating N different addresses, randomly distributing the generated N addresses to the storage addresses of the N discretization modulation amplitude values, and sequentially reading and outputting the discretization modulation amplitude values according to the sequence of the N addresses.
Another embodiment of the present invention provides a display panel ripple removing apparatus, including:
the acquisition module is used for acquiring the modulation frequency and the modulation amplitude of spread spectrum and calculating the modulation period T of the spread spectrum according to the modulation frequency of the spread spectrum;
the discretization module is used for discretizing the modulation amplitude in one modulation period of the spread spectrum to obtain N discretization modulation amplitude values, wherein N is a positive integer;
a random address generating module, configured to generate N addresses that are different from each other and randomly allocate the N addresses to be storage addresses of the N discretization modulation amplitude values when a frame start signal is received;
and the output module is used for sequentially reading and outputting the discretization modulation amplitude values according to the sequence of the N addresses.
Optionally, the discretization module includes:
and the discretization unit is used for dividing one modulation cycle of the spread spectrum into N cycle points at the time interval of T/N, and acquiring the frequency modulation amplitude value corresponding to each cycle point to obtain N discretization modulation amplitude values.
Optionally, the method further includes:
and the repeating module is used for continuously generating N different addresses, randomly distributing the generated N addresses to the storage addresses of the N discretization modulation amplitude values, and sequentially reading and outputting the discretization modulation amplitude values according to the sequence of the N addresses.
According to another embodiment of the present invention, there is provided a display device, including the apparatus for eliminating water ripples of the display panel as described above.
Optionally, the display device adopts a liquid crystal display panel.
Yet another embodiment of the present invention provides a readable storage medium, on which a program or instructions are stored, which when executed by a processor implement the steps of the method for eliminating display panel water ripple as described above.
The technical scheme of the invention has the following beneficial effects:
according to the eliminating method provided by the embodiment of the invention, the electromagnetic interference requirement of the display device is met, and meanwhile, the modulation amplitude is discretized and converted into the disordered spread spectrum amplitude for output, so that the pixel charging rate Jitter value can be randomly changed, and the water ripple phenomenon of the display panel is eliminated.
Drawings
Fig. 1 is a schematic diagram of a conventional spread spectrum provided in an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a method for eliminating moire of a display panel according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a random array generation method according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a spread spectrum for eliminating water ripples according to an embodiment of the present invention;
FIG. 5 is a block diagram illustrating a detailed flowchart of a method for eliminating moire of a display panel according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a display panel waviness elimination apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
Please refer to fig. 1, which is a schematic diagram of an original spread spectrum according to an embodiment of the present invention. As shown in fig. 1, all timings applied to the display panel are generated by a reference frequency DE of the screen driving board Tcon, including a GOA signal frequency (STV/CLK, etc.), Sout (serial output), a spread spectrum frequency, and the like. When the screen drive board is heated or receives external force and buckles, inside DE frequency can change, all can change based on each time sequence frequency that DE frequency produced from this, when spread spectrum frequency and CLK frequency mismatch, the Jitter value of charge rate can take place the rule and change. In the display panel of fig. 1, when the adjacent rows CLK1, CLK2, CLK3 and CLK4 are turned off, the spreading frequency is changed regularly, and the charging rate Jitter is also changed regularly as in a-B-C-D in fig. 1, so that the charging rates of the adjacent rows are changed in a gradually increasing-decreasing period, and thus the display panel will display a horizontal rolling ripple, i.e., a water ripple. The direct cause of the water ripple is the change of the Jitter value of the charging rate.
Fig. 2 is a schematic flow chart illustrating a method for eliminating water ripples in a display panel according to an embodiment of the present invention. As shown in fig. 2, based on the above analysis, the inventor provides a method for eliminating the water ripple of the display panel in the embodiment of the present invention, and the method may include the following steps:
step 21: and acquiring the modulation frequency and the modulation amplitude of spread spectrum, and calculating the modulation period T of the spread spectrum according to the modulation frequency of the spread spectrum.
In this step, after the display panel starts to work, the modulation frequency f and the modulation amplitude of the spread spectrum are read, and the modulation amplitude of the spread spectrum can be specifically set according to actual requirements, in the embodiment of the present invention, the modulation amplitude of ± 1.5% is taken as an example, and the modulation frequency f and the modulation period T of the spread spectrum have the following relationship: t is 1/f, so that the modulation period T of the spread spectrum can be calculated from the modulation frequency of the spread spectrum.
Step 22: and discretizing the modulation amplitude in one modulation period of the spread spectrum to obtain N discretized modulation amplitude values, wherein N is a positive integer.
In this step, after the modulation frequency f and the modulation amplitude of the spread spectrum are obtained, discretization processing is further performed on the modulation amplitude within one modulation period T of the spread spectrum, so as to obtain N discretization modulation amplitude values, where N is a positive integer.
In this embodiment of the present invention, the step of obtaining N discrete modulation amplitude values by performing discretization processing on the modulation amplitude in one modulation period of the spread spectrum includes:
and dividing one modulation period T of the spread spectrum into N period points at the time interval of T/N, and acquiring the frequency modulation amplitude value corresponding to each period point to obtain N discretization modulation amplitude values.
As shown in fig. 1, in a modulation period T on the rightmost side in fig. 1, the modulation period T may be divided into N period points at a time interval of T/N (that is, corresponding to N points in the modulation period T on a time axis), and N discretized modulation amplitude values may be obtained by reading a frequency modulation amplitude value corresponding to each period point; that is, the spread spectrum amplitude is taken at intervals of T/N to obtain N discrete modulation amplitude values.
Step 23: and under the condition of receiving a frame start signal, generating N different addresses, and randomly allocating the N addresses as storage addresses of the N discretization modulation amplitude values.
When a frame start Signal (STV) is received, N different addresses are generated, and then the N addresses are randomly allocated to be storage addresses of N discrete modulation amplitude values, so that the N addresses and the N discrete modulation amplitude values are matched in a one-to-one correspondence mode, and the N discrete modulation amplitude values are randomly matched, so that the N discrete modulation amplitude values are out of order and are not changed regularly.
Please refer to fig. 3, which is a diagram illustrating a random number generating method according to an embodiment of the present invention. As shown in fig. 3, in the embodiment of the present invention, when generating N different addresses, a random array may be generated, where the random array is composed of N different elements, and the random array is used as an address, fig. 3 takes an array including 9 elements, where 9 elements are 1, 2, 3, 4, 5, 6, 7, 8, and 9 elements are randomly arranged, and each random array corresponds to N discrete modulation amplitude values in one period.
Step 24: and sequentially reading and outputting the discretization modulation amplitude values according to the sequence of the N addresses.
Fig. 4 is a schematic diagram of a spread spectrum for eliminating water ripples according to an embodiment of the present invention. Since the N addresses are different from each other, the discretization modulation amplitude values are sequentially read and output according to the sequence of the N addresses, and the output N discretization modulation amplitude values can be changed in disorder instead of regular change, so that the change of the actual charging rate Jitter is shown as A '-B' -C '-D' in fig. 4, and the change is disorder, namely no periodic change, and therefore the water ripple of the display panel is eliminated.
In this embodiment of the present invention, after the step of sequentially reading and outputting the discretization modulation amplitude value according to the sequence of the N addresses, the method further includes:
and continuously generating N different addresses, randomly distributing the generated N addresses to the storage addresses of the N discretization modulation amplitude values, and sequentially reading and outputting the discretization modulation amplitude values according to the sequence of the N addresses.
That is to say, the above process may be regarded as the completion of the elimination of the ripple of one frame, and after the output of the first group of N discrete modulation amplitude values is completed, if the elimination of the ripple of the next frame is to be realized, the above steps 23 and 24 may be repeated, specifically, N mutually different addresses continue to be generated, and similarly, the generated N addresses are randomly allocated as the storage addresses of the N discrete modulation amplitude values again; taking a random array as an example, randomly disordering 9 elements in the original random array again to generate a new random array, and taking the new random array as the addresses of N discretization amplitude values; and finally, sequentially reading and outputting the discretization modulation amplitude values according to the sequence of the new N addresses, so that the output N discretization modulation amplitude values are out of sequence and cannot be periodically and regularly changed. And the operation is repeated in a circulating way until the display is finished.
Referring to fig. 5, a specific flowchart of a method for eliminating water ripples in a display panel according to an embodiment of the present invention is shown. As shown in fig. 5, after the display panel starts to work, the modulation amplitude of the spread spectrum is discretized into N values, that is, N discretized amplitude values, specifically, one modulation amplitude value is extracted every T/N time in one period T; when a frame start Signal (STV) arrives, a random array is generated, the random array can be composed of N different elements, the N elements can be taken from 1-N, then the random array is used as the addresses of N discretization amplitude values, and finally the corresponding discretization amplitude values are sequentially output according to the address sequence of the random array, so that the N discretization amplitude values are changed in disorder without periodic change, and the ripple of the display panel can be eliminated when the method is applied to spread spectrum.
According to the eliminating method provided by the embodiment of the invention, the electromagnetic interference requirement of the display device is met, and meanwhile, the modulation amplitude is discretized and converted into the disordered spread spectrum amplitude for output, so that the pixel charging rate Jitter value can be randomly changed, and the water ripple phenomenon of the display panel is eliminated.
Fig. 6 is a schematic structural diagram of a display panel waviness eliminating apparatus according to an embodiment of the present invention. As shown in fig. 6, another embodiment of the present invention further provides a display panel ripple removing apparatus, where the removing apparatus 60 may include:
the obtaining module 61 is configured to obtain a modulation frequency and a modulation amplitude of spread spectrum, and calculate a modulation period T of the spread spectrum according to the modulation frequency of the spread spectrum;
a discretization module 62, configured to perform discretization processing on the modulation amplitude in one modulation period of the spread spectrum to obtain N discretization modulation amplitude values, where N is a positive integer;
a random address generating module 63, configured to generate N different addresses under the condition that a frame start signal is received, and randomly allocate the N addresses as storage addresses of the N discretization modulation amplitude values;
and the output module 64 is configured to sequentially read and output the discretized modulation amplitude values according to the sequence of the N addresses.
The elimination apparatus in the embodiment of the present invention is an apparatus embodiment corresponding to the above elimination method embodiment, and may implement all the steps of the elimination method, and in order to avoid repetition, the embodiment of the present invention is not described again.
According to the eliminating device provided by the embodiment of the invention, the electromagnetic interference requirement of the display device is met, and meanwhile, the modulation amplitude is discretized and converted into the disordered spread spectrum amplitude for output, so that the pixel charging rate Jitter value can be randomly changed, and the water ripple phenomenon of the display panel is eliminated.
Optionally, the discretization module 62 includes:
and the discretization unit is used for dividing one modulation cycle of the spread spectrum into N cycle points at the time interval of T/N, and acquiring the frequency modulation amplitude value corresponding to each cycle point to obtain N discretization modulation amplitude values.
Optionally, the method further includes:
and the repeating module is used for continuously generating N different addresses, randomly distributing the generated N addresses to the storage addresses of the N discretization modulation amplitude values, and sequentially reading and outputting the discretization modulation amplitude values according to the sequence of the N addresses.
According to another embodiment of the present invention, a display device is provided, and the display device includes the device for eliminating the display panel ripple in the above embodiment. The display device in the embodiment of the invention also has the beneficial effects that the modulation amplitude is discretized and converted into the disordered spread spectrum amplitude for output while the electromagnetic interference requirement of the display device is met, so that the pixel charging rate Jitter value can be randomly changed, and the water ripple phenomenon of the display panel is eliminated.
Optionally, in the embodiment of the present invention, the display device employs a liquid crystal display panel.
Still another embodiment of the present invention further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or the instruction is executed by a processor, the method for eliminating the display panel water ripple described in the above method embodiment is implemented, and the same technical effects can be obtained, and are not described herein again to avoid repetition.
While the foregoing is directed to embodiments of the present invention, it will be appreciated by those skilled in the art that various changes and modifications may be made without departing from the principles of the invention, and it is intended that all such changes and modifications be considered as within the scope of the invention.
Claims (9)
1. A method for eliminating water ripples of a display panel is characterized by comprising the following steps:
acquiring the modulation frequency and the modulation amplitude of spread spectrum, and calculating the modulation period T of the spread spectrum according to the modulation frequency of the spread spectrum;
discretizing the modulation amplitude in one modulation period of the spread spectrum to obtain N discretized modulation amplitude values, wherein N is a positive integer;
under the condition that a frame starting signal is received, generating N different addresses, and randomly allocating the N addresses as storage addresses of the N discretization modulation amplitude values;
and sequentially reading and outputting the discretization modulation amplitude values according to the sequence of the N addresses.
2. The cancellation method according to claim 1, wherein the step of discretizing the modulation amplitude within one modulation period of the spread spectrum to obtain N discretized modulation amplitude values comprises:
and dividing one modulation period T of the spread spectrum into N period points at the time interval of T/N, and acquiring the frequency modulation amplitude value corresponding to each period point to obtain N discretization modulation amplitude values.
3. The cancellation method of claim 1, wherein after the step of sequentially reading and outputting the discretized modulation amplitude values in the order of the N addresses, further comprising:
and continuously generating N different addresses, randomly distributing the generated N addresses to the storage addresses of the N discretization modulation amplitude values, and sequentially reading and outputting the discretization modulation amplitude values according to the sequence of the N addresses.
4. An apparatus for eliminating moire of a display panel, comprising:
the acquisition module is used for acquiring the modulation frequency and the modulation amplitude of spread spectrum and calculating the modulation period T of the spread spectrum according to the modulation frequency of the spread spectrum;
the discretization module is used for discretizing the modulation amplitude in one modulation period of the spread spectrum to obtain N discretization modulation amplitude values, wherein N is a positive integer;
a random address generating module, configured to generate N addresses that are different from each other and randomly allocate the N addresses to be storage addresses of the N discretization modulation amplitude values when a frame start signal is received;
and the output module is used for sequentially reading and outputting the discretization modulation amplitude value according to the sequence of the N addresses.
5. The cancellation device of claim 4, wherein the discretization module comprises:
and the discretization unit is used for dividing one modulation cycle of the spread spectrum into N cycle points at the time interval of T/N, and acquiring the frequency modulation amplitude value corresponding to each cycle point to obtain N discretization modulation amplitude values.
6. The cancellation apparatus of claim 4, further comprising:
and the repeating module is used for continuously generating N different addresses, randomly distributing the generated N addresses to the storage addresses of the N discretization modulation amplitude values, and sequentially reading and outputting the discretization modulation amplitude values according to the sequence of the N addresses.
7. A display device comprising the display panel moire removing device as claimed in any one of claims 4 to 6.
8. The display device according to claim 7, wherein the display device employs a liquid crystal display panel.
9. A readable storage medium, on which a program or instructions are stored, which when executed by a processor, implement the steps of the method for display panel waviness elimination according to any one of claims 1 to 3.
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| TWI782717B (en) * | 2021-09-27 | 2022-11-01 | 大陸商北京集創北方科技股份有限公司 | Row driving method, row driving circuit, self-luminous display device and information processing device |
| TWI789942B (en) * | 2021-10-06 | 2023-01-11 | 友達光電股份有限公司 | Display panel under spread spectrum clock and driving method thereof |
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