CN114203129B - Method for automatically correcting abnormal resolution of digital signal of display - Google Patents
Method for automatically correcting abnormal resolution of digital signal of display Download PDFInfo
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- 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 for automatically correcting abnormal resolution of a digital signal of a display, which comprises a main mode tolerance configuration mechanism: after the signal enters a measurement module, a signal screening link is carried out to obtain a group of normalized signal attribute values, and then a main channel is configured; the signal screening is as follows: if the line and field resolutions of the input signal can be inquired in a common resolution table preset by a program and the time sequence is verified to be normal, the current input signal is considered to be a signal which can be identified by a display controller; if the line and field resolutions of the input signals cannot be inquired in a common resolution table preset by a program and the time sequence is not normal, directly abandoning the input signals and measuring the input signals again; the signal with small-range fluctuation of resolution is adjusted, so that the configuration parameters transmitted to the main channel mode by the signal measurement module are ensured to be correct and effective, and the problem of abnormal pictures caused by accidental abnormal mode configuration in the signal switching process of the main controller is solved.
Description
Technical Field
The invention relates to the technical field of digital signal display, in particular to an automatic correction method for abnormal resolution of a digital signal of a display.
Background
In the practical application of the lcd for displaying digital signals, the digital signals are affected by the electromagnetic environment of the transmission line or the application scene, and the actual signals transmitted to the controller may have interference. And the main controller needs to acquire the values of line, field resolution, frequency and the like of the external input signal in the process of configuring the display mode of the main channel to configure the display mode parameters of the current main channel. Therefore, in the signal measurement stage, if the acquired input signal has a small-range fluctuation condition or the signal measurement module directly acquires an interference signal, the controller will obtain a group of nonstandard input signal characteristic information, and the controller does not perform screening and filtering processing on information such as nonstandard line and field resolution, and directly configures wrong characteristic value parameters into the main channel display mode, so that the input signal time sequence is not matched with the main channel time sequence configuration of the main controller, the display picture presents different deformation effects, abnormal phenomena such as picture boundary display residue, font stretching, picture display black edges and incapability of identifying display contents can occur, the display needs to be restarted by manual power-off, and the display picture is normal only when the controller acquires a standard signal recoverable time sequence.
Disclosure of Invention
The present invention provides a method for automatically correcting abnormal resolution of a digital signal of a display to solve the problem of abnormal pictures caused by accidental abnormal mode configuration during signal switching of a main controller.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for automatically correcting abnormal resolution of a digital signal of a display, which comprises the following steps,
a primary mode tolerance configuration mechanism: after the signal enters a measurement module, a signal screening link is carried out to obtain a group of normalized signal attribute values, and then a main channel is configured;
the signal screening is as follows: if the line and field resolutions of the input signal can be inquired in a common resolution table preset by a program and the time sequence is verified to be normal, the current input signal is considered to be a signal which can be identified by a display controller;
if the line and field resolutions of the input signals cannot be obtained by inquiring in a common resolution table preset by a program and the time sequence verification is abnormal, the line and field resolutions are directly abandoned and the input signals start to be measured again.
Further, the query algorithm of the line and field resolution in the common resolution table is as follows:
s1, polling line resolution H in the common resolution table active At the line resolution inH of the input signal active Subtracting the line resolution H in the common resolution table active If the absolute value of (a) is less than the set threshold, the row is considered valid;
s2, using the field resolution ratio inV of the input signal active Subtracting the field resolution V corresponding to the line resolution in the common resolution table active Is less than the set threshold, the best match resolution information (H) for the current input signal is obtained active ,V active )；
S3, after the optimal matching resolution is obtained, if the signal field frequency inV is input Freq Satisfies the range [30,85 ]]Then, the characteristic parameter inH of the input signal Freq 、inV Freq 、inV bp 、inV fp 、inV sync If the formula (3) is satisfied, obtaining a required result and quitting the query;
if the field frequency inV of the input signal is checked Freq Do not satisfy the range [30,85 ]]Then, the characteristic parameter inH of the input signal Freq 、inV Freq 、inV bp 、inV fp 、inV sync If the formula (3) is not satisfied, the next resolution query is continued until the polling of the resolution table in the table is finished, and the process is finished.
Further, the query formula of the common resolution table is as follows:
wherein H active 、V active : respectively representing the line resolution and the field resolution in a preset resolution table;
inH active 、inV active : respectively representing the line and field resolutions of the input signal;
inH Freq 、inV Freq : respectively representing the line and field frequencies of the input signal;
inV sync : a field sync representing the input signal;
inV bp 、inV fp : respectively representing the field front and the field rear of the input signal;
threshold value: the empirical value is set to 3.
Further, the method for querying the formula of the common resolution table includes:
s10, when the calculated resolution error is 0, namely the resolution of the input signal given by the measuring module can be directly and accurately found out in the common resolution table, the signal time sequence parameter value of the group meets the display configuration requirement, and then the time sequence parameter value of the group is taken out to directly configure the main channel display mode;
s20, when the calculated resolution error is smaller than or equal to a specified threshold value, indicating that the time sequence of the input signal fluctuates, firstly matching to obtain the closest standard resolution, then directly discarding redundant line and field boundaries when configuring a display mode, and configuring the mode according to the standard signal time sequence;
and S30, when the error value is larger than the threshold value, determining that the current input signal cannot be identified, directly discarding the currently acquired signal time sequence parameter by the main controller, forcibly disconnecting the main channel, and acquiring the input signal again by the measuring module to wait for the signal to be recovered to be normal.
Further, during configuration of the main channel display mode,
if the acquired input signal time sequence is a standard value, but the standard value is not matched with the current display mode, at this time, the main mode tolerance configuration mechanism fails, that is, the main controller cannot judge the standard signal time sequence, and the abnormal problems of incomplete display and offset frequency occur on the display picture;
then, a main mode dynamic adaptive adjustment mechanism needs to be adopted, that is, the configuration conditions of the input signal and the display mode need to be monitored in real time according to the input state of the current signal, and the abnormal conditions need to be dynamically adjusted in an adaptive manner, so as to make up for the deficiency of the main mode tolerance configuration mechanism.
Further, the specific method of the dynamic self-adaptive adjustment mechanism of the main mode is as follows:
after an input signal is output to the liquid crystal display, the signal measurement module circularly detects the time sequence of the input signal, the main controller regularly reads a signal time sequence parameter given by the signal measurement module once every 500ms, then the resolution information is checked, and whether the error range between the resolution of the currently configured time-limited mode of the main controller and the resolution of the input signal is smaller than a threshold value or not is checked;
if the signals measured for four times do not meet the requirements, judging that the controller works abnormally, immediately disconnecting the main channel, and restarting to configure the main channel display mode;
and if the calculated error is less than the threshold value and the accumulated error frequency is less than four, directly resetting the accumulated error frequency.
Further, according to the error range of the resolution of the input signal, the input signal is divided into three categories:
first, interference scenario 1
The measured signal resolution is greatly different from a standard value, the display effect of the signal is that an interference line is flashed on an output picture, but if the time sequence of the signal is directly configured into a main channel display mode, the displayed picture can not be directly identified; directly filtering the signal, and re-measuring the input signal by the detection module until an effective value is detected;
second, interference scenario two
The resolution of the input signal fluctuates in a small range, and if the resolution of the main channel configuration mode is the value, the situations of picture boundary residue and the like can occur; the signal is required to be adjusted to a standard signal, and then a main channel is configured according to a standard time sequence;
third, interference scenario three
The resolution ratio of the interference signal is a standard value, although the resolution ratio set by the main mode is the standard value, the display has the problem of screen deflection or incomplete display if the resolution ratio is not matched with the input signal, a circulating signal detection mechanism needs to be established at the signal display stage, whether the input signal is matched with the display mode or not is monitored in real time, and when the input signal is found to be not matched with the display mode, the configuration is restarted immediately.
The invention has the beneficial effects that: before the main controller configures the main channel display mode for operation, a set of signal filtering and correcting mechanism is added, namely input abnormal signals with abnormal high resolution are filtered, signals with small fluctuation range of resolution are adjusted, and it is ensured that parameters of the configuration transmitted to the main channel mode by the signal measuring module are correct and effective, so that the problem of abnormal pictures caused by accidental abnormal mode configuration in the signal switching process of the main controller is solved.
The detection module measures the input signal in real time, captures abnormal resolution and prints and outputs abnormal conditions, so that the problem of a signal transmission line is solved, and the quality of a signal source is estimated;
before the main channel mode is configured, detecting a characteristic value of an input signal, inquiring a preset standard resolution table by taking resolution as a retrieval condition, directly abandoning and detecting a signal larger than a threshold value again to solve the problem of screen splash display;
a tolerance configuration mechanism is adopted, redundant row and field values are forcibly cut for input signals fluctuating in a small range, and the standard values are always used as parameters configured in a main channel mode, so that the problem of display edge residue is solved;
in the signal stable display stage, the characteristic value of the signal is measured at regular time, and whether the resolution ratio of the signal and the resolution ratio configured in the main channel mode are within a specified threshold value or not is checked, so that the problem that the display modes of display effect, such as screen bias, incomplete display and the like are not matched is solved.
Drawings
FIG. 1 is a flow chart of three types of interference signal division and processing;
FIG. 2 is a flow diagram of a master mode tolerance configuration mechanism;
FIG. 3 is a flow chart of resolution screening of the master mode tolerance configuration mechanism;
fig. 4 is a flowchart of the dynamic adaptive modulation control of the main mode.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The method comprises the steps of measuring the resolution ratio of an input signal by using a signal measuring module of a main controller, calculating an error value between the input signal and a standard resolution ratio by taking the resolution ratio as a judgment condition, dividing the input signal into three types according to the error range of the resolution ratio of the input signal, and sequentially expanding the three directions divided from an interference signal.
Referring to fig. 1, the input signals are classified into three categories according to the error range of the input signal resolution:
first class, interference scenario one
If the measured signal resolution is greatly different from the standard value, for example, the input signal resolution is 1600 × 1200, but the resolution detected by the controller measurement module is 4096 × 1206, etc., the display effect of the signal is that an interference line appears on the output image, but if the time sequence of changing the signal is directly configured into the main channel display mode, the displayed image cannot be identified directly; directly filtering the signal, and measuring the input signal again by the detection module until an effective value is detected;
second, interference scenario two
The resolution of the input signal fluctuates within a small range, for example 1600 × 1202, and if the resolution of the main channel configuration mode is the value, the situation of frame boundary residue and the like may occur; the signal is required to be adjusted into a standard signal, and then a main channel is configured according to a standard time sequence;
third, interference scenario three
The resolution of the interference signal is a standard value, and although the resolution set by the main mode is the standard value, for example, the resolution of the input signal is 1600 × 1200, a signal with the resolution of 800 × 600 may be doped, but the display may also have a problem of screen offset or incomplete display if the input signal is not matched with the input signal.
The main channel mode display configuration value of the main controller is determined by the currently acquired input signal, but the detected input signal may have interference or fluctuation, so before the mode of the main channel is configured, a resolution tolerance screening mechanism is added, the input signal is firstly selected by brushing to obtain a group of normalized signal attribute values, and then the main channel is configured. In the digital signal display stage, the timing sequence of the input signal is detected regularly for 500ms, and then whether the resolution of the current display mode and the resolution of the input signal are within a specified error range is checked to eliminate the influence on the configuration of the main mode when the interference signal is a standard value.
An automatic correction method for abnormal resolution of digital signal of display comprises,
referring to fig. 2, the main mode tolerance configuration mechanism: after the signal enters a measurement module, a signal screening link is carried out to obtain a group of normalized signal attribute values, and then a main channel is configured;
the signal screening is as follows: if the line and field resolutions of the input signals can be obtained by inquiring in a common resolution table preset by a program and the time sequence is verified to be normal, the current input signals are considered to be signals recognizable by the display controller;
if the line and field resolutions of the input signals cannot be obtained by inquiring in a common resolution table preset by a program and the time sequence verification is abnormal, the line and field resolutions are directly abandoned and the input signals start to be measured again.
The query algorithm of the line and field resolutions in the common resolution table is as follows:
s1, polling line resolution H in the common resolution table active With the line resolution inH of the input signal active Subtracting the line resolution H in the common resolution table active If the absolute value of (a) is less than the set threshold, the row is considered valid;
s2, using the field resolution ratio inV of the input signal active Subtracting the field resolution V corresponding to the line resolution in the common resolution table active Is less than a set threshold value, the best matching resolution information (H) of the current input signal is obtained active ,V active )；
S3, after the optimal matching resolution is obtained, if the field frequency of the input signal is inV Freq Satisfies the range [30,85 ]]Then, the characteristic parameter inH of the input signal Freq 、inV Freq 、inV bp 、inV fp 、inV sync If the formula (3) is met, obtaining a required result and quitting the query;
if the field frequency inV of the input signal is checked Freq Does not satisfy the range [30,85 ]]Then, the characteristic parameter inH of the input signal Freq 、inV Freq 、inV bp 、inV fp 、inV sync If the formula (3) is not satisfied, the next resolution query is continued until the polling of the resolution table in the table is finished, and the process is finished.
The query formula of the common resolution table is as follows:
wherein H active 、V active : respectively representing the line resolution and the field resolution in a preset resolution table;
inH active 、inV active : respectively representing the line and field resolutions of the input signals;
inH Freq 、inV Freq : respectively representing the line and field frequencies of the input signal;
inV sync : representing a field sync of the input signal;
inV bp 、inV fp : respectively representing the field front and the field rear of the input signal;
threshold value: the empirical value is set to 3.
Wherein, the commonly used resolution is shown in Table 1
Table 1: common resolution table
| Serial number | Line resolution | Resolution of |
| 1 | 1920 | 1200 |
| 2 | 1920 | 1080 |
| 3 | 1680 | 1050 |
| 4 | 1600 | 1200 |
| 5 | 1400 | 1050 |
| 6 | 1360 | 768 |
| 7 | 1280 | 1024 |
| 8 | 1280 | 960 |
| 9 | 1280 | 800 |
| 10 | 1280 | 768 |
| 11 | 1280 | 600 |
| 12 | 1024 | 768 |
| 13 | 800 | 600 |
| 14 | 640 | 480 |
Referring to fig. 3, the method for querying the formula of the common resolution table includes:
s10, when the calculated resolution error is 0, namely the resolution of the input signal given by the measuring module can be directly and accurately found out in the common resolution table, the signal time sequence parameter value of the group meets the display configuration requirement, and then the time sequence parameter value of the group is taken out to directly configure the main channel display mode;
s20, when the calculated resolution error is less than or equal to a specified threshold value, indicating that the time sequence of the input signal fluctuates, firstly matching to obtain the closest standard resolution, and then directly discarding redundant line and field boundaries when configuring a display mode to configure the mode according to the standard signal time sequence;
and S30, when the error value is larger than the threshold value, considering that the current input signal cannot be identified, directly discarding the currently acquired signal timing sequence parameter by the main controller, forcibly disconnecting the main channel, and acquiring the input signal again by the measuring module to wait for the signal to be recovered to be normal.
During configuration of the main channel display mode,
if the acquired input signal time sequence is a standard value, but the standard value is not matched with the current display mode, at this time, the main mode tolerance configuration mechanism fails, that is, the main controller cannot judge the standard signal time sequence, and the abnormal problems of incomplete display and offset frequency occur on the display picture;
then, a main mode dynamic adaptive adjustment mechanism needs to be adopted, that is, the configuration conditions of the input signal and the display mode need to be monitored in real time according to the input state of the current signal, and an abnormal condition needs to be dynamically adjusted in an adaptive manner, so as to make up for the deficiency of the main mode tolerance configuration mechanism.
Referring to fig. 4, a specific method of the dynamic adaptive modulation control of the main mode includes:
after an input signal is output to a liquid crystal display, the signal measurement module circularly detects the time sequence of the input signal, the main controller regularly reads the signal time sequence parameters given by the signal measurement module once every 500ms, then the resolution information is checked, and whether the error range between the resolution of the currently configured time-limited mode of the main controller and the resolution of the input signal is smaller than a threshold value or not is checked;
if the signals measured for four times do not meet the requirements, judging that the controller works abnormally, immediately disconnecting the main channel, and restarting to configure the main channel display mode;
and if the calculated error is less than the threshold value and the accumulated error times are less than four, directly resetting the accumulated error times.
In the existing automatic updating method of digital signal parameters, a detection module is adopted to periodically detect whether the error between an input signal and a controller configuration mode is within a threshold value. This patent only uses this method as a compensation measure when the interference signal is a standard value. On the basis, an interference signal filtering mechanism and a fluctuation signal adjusting mechanism are fused by combining with an actual application scene.
The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (5)
1. A method for automatically correcting abnormal resolution of digital signals of a display is characterized by comprising the following steps,
a primary mode tolerance configuration mechanism: after the signal enters a measurement module, a signal screening link is carried out to obtain a group of normalized signal attribute values, and then a main channel is configured;
the signal screening is as follows: if the line and field resolutions of the input signal can be inquired in a common resolution table preset by a program and the time sequence is verified to be normal, the current input signal is considered to be a signal which can be identified by a display controller;
if the line and field resolutions of the input signals cannot be inquired in a common resolution table preset by a program and the time sequence is not normal, directly abandoning the input signals and measuring the input signals again;
the query algorithm of the line and field resolutions in the common resolution table is as follows:
s1, firstly polling the line resolution H in the common resolution table active At the line resolution inH of the input signal active Subtracting the line resolution H in the common resolution table active If the absolute value of (a) is less than the set threshold, the row is considered valid;
s2, using the field resolution ratio inV of the input signal active Subtracting the field resolution V corresponding to the line resolution in the common resolution table active Is less than the set threshold, the best match resolution information (H) for the current input signal is obtained active ,V active )；
S3, after the optimal matching resolution is obtained, if the field frequency of the input signal is inV Freq Satisfies the range [30,85 ]]Then, the characteristic parameter inH of the input signal Freq 、inV Freq 、inV bp 、inV fp 、inV sync If the formula (3) is met, obtaining a required result and quitting the query;
if the field frequency inV of the input signal is checked Freq Do not satisfy the range [30,85 ]]Then, the characteristic parameter inH of the input signal Freq 、inV Freq 、inV bp 、inV fp 、inV sync If the formula (3) is not satisfied, continuing the next resolution ratio query until the polling of the resolution ratio table in the table is finished, and ending the process;
the query formula of the common resolution table is as follows:
wherein H active 、V active : respectively representing the line resolution and the field resolution in a preset resolution table;
inH active 、inV active : respectively representing the line and field resolutions of the input signal;
inH Freq 、inV Freq : respectively representing the line and field frequencies of the input signal;
inV sync : a field sync representing the input signal;
inV bp 、inV fp : respectively representing the field front and back delays of the input signal;
threshold value: the empirical value is set to 3.
2. The method as claimed in claim 1, wherein the method for automatically correcting abnormal resolution of digital signal on display comprises the following steps:
s10, when the calculated resolution error is 0, namely the resolution of the input signal given by the measuring module can be directly and accurately found out in the common resolution table, the signal time sequence parameter value of the group meets the display configuration requirement, and then the time sequence parameter value of the group is taken out to directly configure the main channel display mode;
s20, when the calculated resolution error is less than or equal to a specified threshold value, indicating that the time sequence of the input signal fluctuates, firstly matching to obtain the closest standard resolution, and then directly discarding redundant line and field boundaries when configuring a display mode to configure the mode according to the standard signal time sequence;
and S30, when the error value is larger than the threshold value, considering that the current input signal cannot be identified, directly discarding the currently acquired signal timing sequence parameter by the main controller, forcibly disconnecting the main channel, and acquiring the input signal again by the measuring module to wait for the signal to be recovered to be normal.
3. The method for automatically correcting the abnormal resolution of the digital signal of the display according to claim 2, wherein the method comprises the following steps: during the configuration of the main channel display mode,
if the acquired input signal time sequence is a standard value, but the standard value is not matched with the current display mode, at the moment, the main mode tolerance configuration mechanism fails, namely the main controller cannot judge the standard signal time sequence, and the abnormal problems of incomplete display and offset frequency occur on the display picture;
then, a main mode dynamic adaptive adjustment mechanism needs to be adopted, that is, the configuration conditions of the input signal and the display mode need to be monitored in real time according to the input state of the current signal, and an abnormal condition needs to be dynamically adjusted in an adaptive manner, so as to make up for the deficiency of the main mode tolerance configuration mechanism.
4. The method of claim 3, wherein the method for automatically adjusting the abnormal resolution of the digital signal of the display according to the main mode comprises the following specific steps:
after the input signal is output to the liquid crystal display, the signal measurement module circularly detects the input signal time sequence, the main controller regularly reads the signal time sequence parameter given by the signal measurement module once every 500ms, then the resolution information is checked, and whether the error range of the resolution of the currently configured time-limited mode of the main controller and the resolution of the input signal is smaller than a threshold value or not is checked;
if the signals measured for four times do not meet the requirements, judging that the controller works abnormally, immediately disconnecting the main channel, and restarting to configure the main channel display mode;
and if the calculated error is less than the threshold value and the accumulated error frequency is less than four, directly resetting the accumulated error frequency.
5. The method for automatically correcting the abnormal resolution of the digital signal of the display according to claim 1, wherein the method comprises the following steps: according to the error range of the input signal resolution, the input signals are divided into three categories:
first, interference scenario 1
The measured signal resolution is greatly different from a standard value, the display effect of the signal is to flash an interference line on an output picture, but if the time sequence of the signal is directly configured into a main channel display mode, the displayed picture can not be directly identified; directly filtering the signal according to the condition of the interference scene one, and measuring the input signal again by a detection module until an effective value is detected;
second, interference scenario two
The resolution of the input signal fluctuates in a small range, and if the resolution of the main channel configuration mode is the value, the situations of picture boundary residue and the like can occur; aiming at the situation of the interference scene two, the signal is adjusted to be a standard signal, and then a main channel is configured according to a standard time sequence;
third, interference scenario three
And aiming at the situation of an interference scene III, a cyclic signal detection mechanism is established at the signal display stage, whether the input signal is matched with the display mode or not is monitored in real time, and when mismatching is found, the configuration is restarted immediately.
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