CN110246467B - Method and device for protecting screen of liquid crystal display - Google Patents
Method and device for protecting screen of liquid crystal display Download PDFInfo
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- CN110246467B CN110246467B CN201910532195.7A CN201910532195A CN110246467B CN 110246467 B CN110246467 B CN 110246467B CN 201910532195 A CN201910532195 A CN 201910532195A CN 110246467 B CN110246467 B CN 110246467B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—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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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
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Abstract
The invention discloses a method, a device and equipment for protecting a screen of a liquid crystal display and a computer readable storage medium, wherein the method comprises the following steps: recording the time length when the liquid crystal display starts to operate; judging whether the duration reaches a first preset duration, if so, switching a first coding standard in the liquid crystal display into a second coding standard; the first coding standard is a coding standard when the liquid crystal display normally displays, and the second coding standard is a coding standard when the liquid crystal display abnormally displays; and when the running time of the liquid crystal display under the second coding standard reaches a second preset time, switching the second coding standard into the first coding standard, recording the time again, and returning to the step of judging whether the time reaches the first preset time until the liquid crystal display stops working. According to the technical scheme, the liquid crystal display can be prevented from generating the residual image during operation as much as possible, so that the picture can be normally displayed, and the visual effect and the impression can be improved.
Description
Technical Field
The present invention relates to the field of liquid crystal display technologies, and in particular, to a method, an apparatus, a device, and a computer-readable storage medium for protecting a screen of a liquid crystal display.
Background
With the continuous development of display technology, liquid crystal displays having the characteristics of low power consumption, low radiation, soft display picture, thin body and the like are widely used.
At present, in the operation process of a liquid crystal display, when the whole screen or a certain area of the screen of the liquid crystal display displays the same static picture for a long time (for example, when a monitoring picture is displayed, a certain area of the screen displays the same static picture for a long time), the liquid crystal display may have a residual image (when the picture is switched, the previous picture does not disappear immediately, but slowly disappears), that is, the liquid crystal display may have abnormal display, and therefore, the visual effect and the impression may be affected.
In summary, a technical problem to be solved by those skilled in the art is how to prevent the liquid crystal display from having a residual image during operation as much as possible so that the image can be displayed normally and the visual effect and the impression can be improved.
Disclosure of Invention
In view of the above, the present invention provides a method, an apparatus, a device and a computer readable storage medium for protecting a screen of a liquid crystal display, so as to prevent the occurrence of afterimages during the operation of the liquid crystal display as much as possible, thereby enabling the normal display of the image and further improving the visual effect and the look and feel.
In order to achieve the above purpose, the invention provides the following technical scheme:
a screen protection method of a liquid crystal display comprises the following steps:
recording the time length when the liquid crystal display starts to operate;
judging whether the duration reaches a first preset duration, if so, switching a first coding standard in the liquid crystal display into a second coding standard; the first coding standard is a coding standard when the liquid crystal display displays normally, and the second coding standard is a coding standard when the liquid crystal display displays abnormally;
when the running time of the liquid crystal display under the second coding standard reaches a second preset time, switching the second coding standard to the first coding standard, recording the time again, and returning to the step of judging whether the time reaches the first preset time or not until the liquid crystal display stops working; and the second preset time length is less than the first preset time length.
Preferably, switching the first coding standard in the liquid crystal display to the second coding standard includes:
switching the first encoding standard to the second encoding standard within the liquid crystal display is achieved by switching TI _ MODE value data in LVDS format from a first setting value to a second setting value;
switching the second coding standard to the first coding standard, comprising:
switching the second encoding standard to the first encoding standard is achieved by switching TI _ MODE value data in LVDS format from the second setting value to the first setting value.
Preferably, when the first encoding standard in the liquid crystal display is switched to the second encoding standard, the method further includes:
displaying a prompt box of screen protection on a screen of the liquid crystal display;
when switching the second encoding standard to the first encoding standard, further comprising:
and displaying a prompt box for ending the screen protection on the screen of the liquid crystal display.
Preferably, the prompt box of the screen saver and the prompt box of the screen saver ending are both fixed in a preset area of the screen.
Preferably, the prompt box of the screen saver and the prompt box of the screen saver ending move in the screen.
A liquid crystal display screen protection device, comprising:
the recording time length module is used for recording time length when the liquid crystal display starts to operate;
the judging module is used for judging whether the duration reaches a first preset duration, and if so, switching the first coding standard in the liquid crystal display into a second coding standard; the first coding standard is a coding standard when the liquid crystal display displays normally, and the second coding standard is a coding standard when the liquid crystal display displays abnormally;
the switching module is used for switching the second coding standard to the first coding standard when the running time of the liquid crystal display under the second coding standard reaches a second preset time, recording the time again, and returning to execute the step of judging whether the time reaches the first preset time until the liquid crystal display stops working; and the second preset time length is less than the first preset time length.
Preferably, the judging module includes a first switching unit configured to switch the first encoding standard in the liquid crystal display to the second encoding standard by switching TI _ MODE value data in an LVDS format from a first setting value to a second setting value;
the switching module includes a second switching unit that switches the second encoding standard to the first encoding standard by switching TI _ MODE value data in LVDS format from the second setting value to the first setting value.
Preferably, the method further comprises the following steps:
the first display module is used for displaying a prompt box of screen protection on a screen of the liquid crystal display when the first coding standard in the liquid crystal display is switched to the second coding standard;
and the second display module is used for displaying a prompt box for ending screen protection on the screen of the liquid crystal display when the second coding standard is switched to the first coding standard.
A liquid crystal display screen saver device comprising:
a memory for storing a computer program;
a processor for implementing the steps of the method for protecting a screen of a liquid crystal display as claimed in any one of the above claims when executing a computer program.
A computer-readable storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of the method of screen saver for a liquid crystal display as claimed in any preceding claim.
The invention provides a method, a device, equipment and a computer readable storage medium for protecting a screen of a liquid crystal display, wherein the method comprises the following steps: recording the time length when the liquid crystal display starts to operate; judging whether the duration reaches a first preset duration, if so, switching a first coding standard in the liquid crystal display into a second coding standard; the first coding standard is a coding standard when the liquid crystal display normally displays, and the second coding standard is a coding standard when the liquid crystal display abnormally displays; when the running time of the liquid crystal display under the second coding standard reaches a second preset time, switching the second coding standard into the first coding standard, recording the time again, and returning to the step of judging whether the time reaches the first preset time until the liquid crystal display stops working; and the second preset time length is less than the first preset time length.
According to the technical scheme, the time length is recorded when the liquid crystal display starts to operate, the first coding standard in the liquid crystal display is switched to the second coding standard when the recorded time length is longer than the first preset time length, the liquid crystal display is enabled to display abnormally and continue for the second preset time length, then the time length is recorded again, and the steps are returned to be executed until the liquid crystal display stops working, so that the same static picture is prevented from being displayed on the whole screen or a certain area of the screen of the liquid crystal display for a long time, the phenomenon that the liquid crystal display generates the residual image in the display process is avoided as much as possible, the picture on the screen of the liquid crystal display can be displayed normally, and the visual effect and the visual feeling are further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flowchart illustrating a method for protecting a screen of a liquid crystal display according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a LCD screen protection apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a screen saver of a liquid crystal display according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, which shows a flowchart of a method for protecting a screen of a liquid crystal display according to an embodiment of the present invention, the method may include:
s11: the duration of the recording is when the liquid crystal display starts to operate.
When the liquid crystal display starts to operate, the function of screen saver is started, i.e., the recording duration is started.
S12: and judging whether the time length reaches a first preset time length. If yes, go to step S13, otherwise, continue recording the duration, and go to step S12.
S13: the first encoding standard in the liquid crystal display is switched to the second encoding standard.
The first coding standard is a coding standard when the liquid crystal display is normally displayed, and the second coding standard is a coding standard when the liquid crystal display is abnormally displayed.
And judging whether the recorded duration reaches a first preset duration or not in real time while recording the duration, wherein the first preset duration can be preset according to the working condition of the liquid crystal display, and specifically, the first preset duration is less than the duration when the liquid crystal display displays the same picture for a long time and the afterimage phenomenon occurs. In practical applications, the first preset time period may be set to 4 hours or other time periods according to the operation condition of the liquid crystal display.
And if the recorded duration reaches a first preset duration, switching the first coding standard in the liquid crystal display into a second coding standard, wherein the first coding standard is a coding standard when the liquid crystal display normally displays, namely the coding standard is matched with the liquid crystal display, and the second coding standard is a coding standard when the liquid crystal display abnormally displays, namely the second coding standard is not matched with the liquid crystal display. Wherein, the coding standard mentioned here is VESA and JIEDA specifically, because the coding standard matched and used by different liquid crystal displays is different, if the matching coding standard when the liquid crystal display normally displays is one of VESA and JIEDA, when the recorded time length reaches the first preset time length, the coding standard in the liquid crystal display can be switched to another coding standard, for example: if the first encoding standard matched when the liquid crystal display normally displays is VESA, the VESA encoding standard in the liquid crystal display may be switched to JIEDA encoding standard when the recorded time length reaches the first preset time length.
Since the LCD can normally display the picture only when the LCD works at the code standard matched with the LCD, when the LCD is switched from the first code standard matched with the LCD to the second code standard during the operation, the LCD will generate screen splash and can not normally display the picture, i.e. the pixels on the LCD will generate random deflection. That is, the normal display picture of the liquid crystal display is changed into the abnormal display picture by switching the coding standard, so that the phenomenon that the same static picture is displayed for a long time on the liquid crystal display is prevented, and the phenomenon of image sticking when the liquid crystal display operates is avoided.
If the recorded duration does not reach the first preset duration, the recording of the duration may be continued, and step S12 is executed, i.e., whether the recording duration reaches the first preset duration is determined in real time.
S14: and when the running time of the liquid crystal display under the second coding standard reaches a second preset time length, switching the second coding standard into the first coding standard.
And the second preset time length is less than the first preset time length.
S15: the re-recording duration. And returns to step 12 until the liquid crystal display stops working.
When the first coding standard in the liquid crystal display is switched to the second coding standard and the running time of the liquid crystal display under the second coding standard reaches a second preset time length, the second coding standard can be switched to the first coding standard, so that the liquid crystal display can normally display the picture again. The second preset time is shorter than the first preset time, so that the influence on the display effect caused by the fact that the liquid crystal display abnormally displays the picture for a long time is avoided, and the appearance and the visual effect are improved. For example: the second preset time period may be 10 seconds or other suitable time period.
After the second encoding standard is switched to the first encoding standard, the recording duration is restarted, that is, the recording duration is restarted from 0, and the step S12 is executed again, and whether the recorded duration reaches the first preset duration or not and the subsequent steps are executed in real time until the liquid crystal display stops working, so as to avoid the phenomenon that the liquid crystal display displays the same still picture for a long time, and further avoid the phenomenon of image sticking when the liquid crystal display operates.
According to the technical scheme, the time length is recorded when the liquid crystal display starts to operate, the first coding standard in the liquid crystal display is switched to the second coding standard when the recorded time length is longer than the first preset time length, the liquid crystal display is enabled to display abnormally and continue for the second preset time length, then the time length is recorded again, and the steps are returned to be executed until the liquid crystal display stops working, so that the same static picture is prevented from being displayed on the whole screen or a certain area of the screen of the liquid crystal display for a long time, the phenomenon that the liquid crystal display generates the residual image in the display process is avoided as much as possible, the picture on the screen of the liquid crystal display can be displayed normally, and the visual effect and the visual feeling are further improved.
The method for protecting the screen of the liquid crystal display provided by the embodiment of the invention switches the first coding standard in the liquid crystal display into the second coding standard, and can comprise the following steps:
switching a first encoding standard in the liquid crystal display to a second encoding standard by switching the TI _ MODE value data in LVDS format from a first setting value to a second setting value;
switching the second coding standard to the first coding standard may include:
switching the second encoding standard to the first encoding standard is achieved by switching the TI _ MODE value data in the LVDS format from the second setting value to the first setting value.
When the encoding standard is switched, it can be realized by switching the TI _ MODE value data in the LVDS format. Specifically, switching the first encoding standard to the second encoding standard in the liquid crystal display may be achieved by switching TI _ MODE value data in LVDS format from a first setting value corresponding to the first encoding standard to a second setting value corresponding to the second encoding standard, and switching the second encoding standard in the liquid crystal display to the first encoding standard may be achieved by switching TI _ MODE value data in LVDS format from the second setting value to the first setting value, where the setting values are specifically 0, 1, for example: if the first encoding standard matched when the lcd normally displays is VESA and VESA corresponds to 0 (in this case, 1 corresponds to JIEDA), switching the VESA encoding standard in the lcd to the JIEDA encoding standard can be performed by switching the TI _ MODE value data in LVDS format from 0 to 1.
That is, switching between encoding standards can be achieved directly by switching of TI _ MODE value data in LVDS format, so that random deflection of liquid crystal display screen pixels occurs: if the TI _ MODE value is correctly switched and set, the liquid crystal display corresponds to the matched coding standard, at the moment, the liquid crystal display performs normal display, if the TI _ MODE value data is incorrectly set, the liquid crystal display corresponds to the unmatched coding standard, and at the moment, the liquid crystal display performs abnormal display.
The MODE of directly switching between the encoding standards by switching the TI _ MODE value data in the LVDS format is simple and convenient to operate and high in efficiency, so that the phenomenon of image sticking of the liquid crystal display can be avoided as much as possible.
The method for protecting the screen of the liquid crystal display provided by the embodiment of the invention can further comprise the following steps of when the first coding standard in the liquid crystal display is switched to the second coding standard:
displaying a prompt box of screen protection on a screen of the liquid crystal display;
when switching the second encoding standard to the first encoding standard, the method may further include:
and displaying a prompt box for ending the screen protection on a screen of the liquid crystal display.
When the first coding standard in the liquid crystal display is switched to the second coding standard, a prompt box of screen protection can be displayed on the screen of the liquid crystal display, and when the second coding standard is switched to the first coding standard, a prompt box of screen protection ending can be displayed on the screen of the liquid crystal display to play a role of prompting a user, so that the user is prevented from taking action due to abnormal display of the liquid crystal display, and further, the influence on the normal operation of the liquid crystal display is avoided.
After the prompt box of the screen saver is displayed on the screen, the prompt box of the screen saver can be continuously displayed on the screen until the second coding standard is switched to the first coding standard, and then the prompt box of the screen saver can be switched to the prompt box of the screen saver, so that the continuous prompt effect is achieved for the user.
According to the method for protecting the screen of the liquid crystal display, provided by the embodiment of the invention, the prompt box of the screen protection and the prompt box of the screen protection end are fixed in the preset area of the screen.
The prompt box of the screen saver and the prompt box of the screen saver ending can be fixed in a preset area of the screen, for example: the screen can be fixed at any one position of the upper right corner, the lower right corner, the upper left corner and the lower left corner of the screen so as to reduce the influence on the picture displayed on the screen as much as possible.
According to the method for protecting the screen of the liquid crystal display, provided by the embodiment of the invention, the prompt box of the screen protection and the prompt box of the screen protection end move in the screen.
The prompt box of the screen saver and the prompt box of the screen saver ending can also run in the screen, wherein the motion mentioned here can be random motion or regular motion so as to give an obvious prompt to the user.
An embodiment of the present invention further provides a screen protection device for a liquid crystal display, and referring to fig. 2, a schematic structural diagram of the screen protection device for a liquid crystal display provided in the embodiment of the present invention is shown, and the screen protection device for a liquid crystal display may include:
a recording time length module 11, configured to record a time length when the liquid crystal display starts to operate;
the judging module 12 is configured to judge whether the duration reaches a first preset duration, and if so, switch the first coding standard in the liquid crystal display to a second coding standard; the first coding standard is a coding standard when the liquid crystal display normally displays, and the second coding standard is a coding standard when the liquid crystal display abnormally displays;
the switching module 13 is configured to switch the second coding standard to the first coding standard when the operation duration of the liquid crystal display under the second coding standard reaches a second preset duration, record the duration again, and return to the step of determining whether the duration reaches the first preset duration until the liquid crystal display stops operating; and the second preset time length is less than the first preset time length.
In the lcd screen protection device provided in the embodiment of the present invention, the determining module 12 may include a first switching unit, configured to switch the first encoding standard in the lcd to the second encoding standard by switching the TI _ MODE value data in the LVDS format from the first setting value to the second setting value;
the switching module 13 may include a second switching unit for switching the second encoding standard to the first encoding standard by switching the TI _ MODE value data in the LVDS format from the second setting value to the first setting value.
The screen protection device for the liquid crystal display provided by the embodiment of the invention can also comprise:
the first display module is used for displaying a prompt box of screen protection on a screen of the liquid crystal display when the first coding standard in the liquid crystal display is switched to the second coding standard;
and the second display module is used for displaying a prompt box for ending the screen protection on the screen of the liquid crystal display when the second coding standard is switched to the first coding standard.
An embodiment of the present invention further provides a liquid crystal display screen protection device, which is shown in fig. 3 and shows a schematic structural diagram of the liquid crystal display screen protection device provided in the embodiment of the present invention, and the liquid crystal display screen protection device may include:
a memory 21 for storing a computer program;
and a processor 22 for implementing the steps of any one of the above-mentioned methods for protecting a screen of a liquid crystal display when executing a computer program.
The embodiment of the invention also provides a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and the computer program is executed by a processor to realize the steps of any one of the liquid crystal display screen protection methods.
The computer-readable storage medium may include various media that can store program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
For a description of a relevant part in the device, the apparatus, and the computer-readable storage medium for protecting the screen of the liquid crystal display according to the embodiments of the present invention, reference may be made to the detailed description of the corresponding part in the method for protecting the screen of the liquid crystal display according to the embodiments of the present invention, and details are not repeated herein.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. 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 elements inherent in the list. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. In addition, parts of the above technical solutions provided in the embodiments of the present invention that are consistent with the implementation principles of the corresponding technical solutions in the prior art are not described in detail, so as to avoid redundant description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A method for protecting a screen of a liquid crystal display, comprising:
recording the time length when the liquid crystal display starts to operate;
judging whether the duration reaches a first preset duration, if so, switching a first coding standard in the liquid crystal display into a second coding standard; the first coding standard is a coding standard when the liquid crystal display displays normally, and the second coding standard is a coding standard when the liquid crystal display displays abnormally;
when the running time of the liquid crystal display under the second coding standard reaches a second preset time, switching the second coding standard to the first coding standard, recording the time again, and returning to the step of judging whether the time reaches the first preset time or not until the liquid crystal display stops working; the second preset time length is less than the first preset time length;
switching a first encoding standard within the liquid crystal display to a second encoding standard, comprising:
switching the first encoding standard to the second encoding standard within the liquid crystal display is achieved by switching TI _ MODE value data in LVDS format from a first setting value to a second setting value;
switching the second coding standard to the first coding standard, comprising:
switching the second encoding standard to the first encoding standard is achieved by switching TI _ MODE value data in LVDS format from the second setting value to the first setting value.
2. The method of claim 1, wherein switching from the first encoding standard to the second encoding standard in the LCD further comprises:
displaying a prompt box of screen protection on a screen of the liquid crystal display;
when switching the second encoding standard to the first encoding standard, further comprising:
and displaying a prompt box for ending the screen protection on the screen of the liquid crystal display.
3. The method as claimed in claim 2, wherein the prompt box for screen saver and the prompt box for screen saver ending are fixed in a preset area of the screen.
4. The method as claimed in claim 2, wherein the prompt box of the screen saver and the prompt box of the screen saver are moved in the screen.
5. A screen saver for a liquid crystal display, comprising:
the recording time length module is used for recording time length when the liquid crystal display starts to operate;
the judging module is used for judging whether the duration reaches a first preset duration, and if so, switching the first coding standard in the liquid crystal display into a second coding standard; the first coding standard is a coding standard when the liquid crystal display displays normally, and the second coding standard is a coding standard when the liquid crystal display displays abnormally;
the switching module is used for switching the second coding standard to the first coding standard when the running time of the liquid crystal display under the second coding standard reaches a second preset time, recording the time again, and returning to execute the step of judging whether the time reaches the first preset time until the liquid crystal display stops working; the second preset time length is less than the first preset time length;
the judging module comprises a first switching unit, which is used for switching the first coding standard in the liquid crystal display to the second coding standard by switching TI _ MODE value data in LVDS format from a first set value to a second set value;
the switching module includes a second switching unit that switches the second encoding standard to the first encoding standard by switching TI _ MODE value data in LVDS format from the second setting value to the first setting value.
6. The screen saver of a liquid crystal display as defined in claim 5, further comprising:
the first display module is used for displaying a prompt box of screen protection on a screen of the liquid crystal display when the first coding standard in the liquid crystal display is switched to the second coding standard;
and the second display module is used for displaying a prompt box for ending screen protection on the screen of the liquid crystal display when the second coding standard is switched to the first coding standard.
7. A liquid crystal display screen saver device comprising:
a memory for storing a computer program;
processor for implementing the steps of the method for screen protection of a liquid crystal display according to any one of claims 1 to 4 when executing a computer program.
8. A computer-readable storage medium, having stored thereon a computer program which, when executed by a processor, carries out the steps of the method of screen saver for liquid crystal displays according to any of claims 1 to 4.
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