CN101866610A - Method for protection of plasma television screen - Google Patents
Method for protection of plasma television screen Download PDFInfo
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- CN101866610A CN101866610A CN 200910106653 CN200910106653A CN101866610A CN 101866610 A CN101866610 A CN 101866610A CN 200910106653 CN200910106653 CN 200910106653 CN 200910106653 A CN200910106653 A CN 200910106653A CN 101866610 A CN101866610 A CN 101866610A
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Abstract
The invention relates to a method for protection of a plasma television screen, which comprises the following steps that: an image displayed on the screen is analyzed to judge whether the displayed image is a static image; and if the image keeps static within a period, the system activates a screensaver to change the state of each light-emitting unit of the screen. Since the image displayed on the screen is analyzed prior to activation of the screensaver, and the state of each light-emitting unit of the screen is changed, the invention realizes the regular refreshing of the light-emitting units of the screen, so that the light-emitting units can recover original states, thereby eliminating residual images and prolonging the service life of the plasma screen.
Description
Technical field
The present invention relates to TV screen resist technology field, more particularly, relate to a kind of be mainly used to improve plasma electric screen ghost phenomena and the raising plasma electric screen screen protection method in serviceable life.
Background technology
Being announced to the world splendidly of plasm TV, allow the world become more truly, more gorgeous, its outstanding expressive force enjoys people's attention and liking.Yet from the PDP display of main light emission, under high brightness still image and long-time calcination, ghost phenomena is very important.
During image freeze, the plasma electric screen is under long illuminating state, particularly brightness is higher and keep static, the bright dark alternate edge part of image, can cause more serious ghost phenomena, behind image modification, originally the border of image is owing to the difference of both sides brightness will be arrived by eye-observation.Calcination for a long time, long-time strong ultraviolet ray irradiation can cause the degeneration of fluorescent powder, cause fluorescent powder visible light exit dose to reduce, thereby reduced the luminescence efficiency of screen luminescence unit internal illumination pipe, difference on the present brightness of image of this degradation table causes image residue and influences view reception effect, and this is a ghost phenomena.Thereby the reduction of the luminescence efficiency of the luminotron of screen luminescence unit inside will reduce the serviceable life of PDP display.Thereby, for a long time, the more broadcast of the still image of high brightness, can shorten the serviceable life of PDP display greatly.
Summary of the invention
Technical matters to be solved by this invention is, provides a kind of and improves the ghost phenomena of plasma television screen and improve the method for protection of plasma television screen in the serviceable life of screen.
The technical solution adopted for the present invention to solve the technical problems is: a kind of method for protection of plasma television screen is provided, comprises the following steps:
A1) the shown display image of screen is analyzed, judged whether described display image is still image;
A2) if judging described display image is still image, then carry out the screen protection action, change the state of each luminescence unit of screen.
Described step a1 in the inventive method) in, data and next frame the data in frame buffer of described display image present frame in internal memory are compared, if data are identical, represent that then this present frame is identical with the next frame image, judge that described display image is a still image; If the data difference represents that then this present frame is different with the next frame image, judge that described display image is a dynamic image.
Step a1 in the inventive method) in, timer is set, a variable T is carried out assignment, initial value is T=0; Data and next frame the data in frame buffer of present frame in internal memory to T=0 described display image constantly compare, if the data difference, promptly described display image is a dynamic image; If data are identical, represent that then the display image of present frame and next frame is identical; Then, T increases a chronomere, T=1, continuation compares the data and the data of next frame in frame buffer of present frame in internal memory of this T=1 described display image constantly, if data are identical, T increases a chronomere again, T=2, again T=2 data and next frame the data in frame buffer of present frame in internal memory are constantly compared, carry out so successively, up to T=n-1, T=n-1 data and next frame the data in frame buffer of described display image present frame in internal memory are constantly compared, if data are identical, promptly described display image is a still image, and T is reset to T=0 with variations per hour.
Described step a2 in the inventive method) in, when carrying out the screen protection action, the VISIBLE LIGHT EMISSION amount of the luminotron by changing described display image luminescence unit inside changes the display brightness of each luminescence unit, perhaps changes the displaying contents of each luminescence unit by the video data that changes storer.
In the methods of the invention, described luminotron is intermittently luminous to be realized with extinguishing the VISIBLE LIGHT EMISSION amount of the luminotron of described change display image luminescence unit inside by making, and perhaps realizes by the VISIBLE LIGHT EMISSION amount of luminotron that reduces the luminescence unit inside of described display image in certain hour, certain level ratio after the overall level of adding up described display image; Perhaps, the video data of described change storer is by processor storer to be read and write video data to realize, and the data transfer mode of storer and processor is parallel transmission, perhaps is serial transmission.
In the methods of the invention, described screen protection action comprises at least that secret note refreshes, mobile pixel, reduces in level and the image switching any one; This method also comprises step a3): the screen protection action is set is opening, and select corresponding screen protection action.
Wherein, secret note refreshes and comprises following steps: form a secret note by the OSD engine on described screen, and control described secret note and move to the other end from an end of described screen, make the luminotron of luminescence unit inside of the described screen brushed by described secret note close, thereby make this parts of images level in the number time, keep certain numerical value, and when level was minimum, the luminotron of this part display image luminescence unit inside kept extinguishing state.
Wherein, described mobile pixel comprises: the row of each pixel by changing described display image simultaneously, a position, whole described display image is moved several pixels upwards, downwards, to the left or to the right, in the process of whole mobile several pixels of display image, the luminotron of luminescence unit inside can extinguish once.
Wherein, described reduction level comprises: reduce the general image level by the VISIBLE LIGHT EMISSION amount that changes the luminotron of display image luminescence unit inside in certain hour, certain level ratio behind the level that calculates described each pixel of display image.
Wherein, described image switching comprises: by regularly the data of exquisite picture, picture, sign or animation segment being replaced the current video data of storer, change the displaying contents of described screen.
Implement method for protection of plasma television screen of the present invention; has following beneficial effect: by the shown display image of screen is analyzed; the state of each luminescence unit that the user can select multi-form screen protection to move to change screen; carry out refreshing of luminescence unit periodically for static image; so that luminescence unit can be got back to initial state preferably; thereby improve the ghost phenomena of screen, improve the serviceable life of PDP display.
Method for protection of plasma television screen of the present invention by selecting different screen protection action, can bring visual enjoyment to the people, can also reach purpose such as energy-conservation.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is a theory diagram of the present invention;
Fig. 2 is the unit module synoptic diagram that the present invention introduces;
Fig. 3 is a round-robin algorithm block diagram of carrying out the screen protection action among the present invention;
Fig. 4 is that image state detects synoptic diagram among the present invention;
Fig. 5 is that signal is carried out the flow system block diagram among the present invention.
Embodiment
Embodiment one:
As shown in Figure 1, be the process flow diagram of embodiments of the invention one.When the screen protection action is set to open (step 101), the user can select any one (step 102) of screen protection action as required, and this embodiment refreshes this screen protection action with the initial selected secret note and sets forth.
At first, utilize the timer of processor, in conjunction with Fig. 2, shown in Figure 4, within a certain period of time, processor produces regularly interruption and a variable T is carried out assignment, initial value is T=0, because the frequency of processor work is a certain value, promptly having determined to carry out within a certain period of time the frequency n that image state detects is certain value.Data and next frame (2nd frame) the data in frame buffer of 201 pairs of display image present frames of image detecting element (the 1st frame) in internal memory compare, if the data difference, promptly display image is a dynamic image 401; If data are identical, the display image of then representing the 1st frame and the 2nd frame is identical, this moment, T increased a chronomere, be T=1, continuation compares this T=1 data and the data of next frame (the 3rd frame) in frame buffer of display image present frame (the 2nd frame) in internal memory constantly, if data are identical, T increases a chronomere again, be T=2, carry out so successively, up to T=(n-1), T=n-1 data and next frame (n+1 frame) the data in frame buffer of display image present frame (n frame) in internal memory are constantly compared, if comparing data is identical, promptly display image is a still image 402, processor resets to variable T simultaneously, i.e. T=0.
Then, image detecting element 201 is given function control unit 202 with this judged result, and as shown in Figure 2, whether result's (step 103) decision that function control unit 202 provides according to image detecting element 201 carries out the screen protection action (step 104) of this scheme:
First kind of judged result: if the result that image detecting element 201 is judged is a still image 402, processor will adopt the mode of OSD (On Screen Display) engine to draw a secret note on screen, and from the screen an end move to the other end, the luminotron of the luminescence unit inside of the screen that control was brushed extinguishes, and the part of promptly being brushed screen is an aterrimus.If the OSD picture position is changed in the time shaft cocycle, can realize the mobile effect of OSD correspondence on screen.In conjunction with shown in Figure 5, the essence that described secret note refreshes is that the processor of televisor controls the luminotron of being brushed screen luminescence unit inside by the storage data that change storer and cuts out, thereby make this parts of images level in the number time, keep certain numerical value, and when level is minimum, the luminotron of this part display image luminescence unit inside keeps extinguishing state, so prevent the degeneration of light-emitting phosphor efficient in the luminotron by the intermittent light on and off of luminotron of control screen luminescence unit inside, thereby improve the luminescence efficiency of luminescence unit, improve the ghost phenomena of PDP display, to prolong the serviceable life of screen.To improve effect under the situation about refreshing comparatively obvious moving on the screen accepting black vertical bar for this scheme.As shown in Figure 1, in this case, the screen protection action is carried out always, has received other event handling signals (step 105) up to processor, for example imports remote signal, changes control signals such as playing video disc, finishes above-mentioned screen protection action.
Second kind of judged result: if the result that image detecting element 201 is judged is a dynamic image 401, in conjunction with shown in Figure 1, then function control unit 202 is not carried out the screen protection action, continue to carry out other event handlings (step 105) by system, again in conjunction with shown in Figure 3, and proceed image state and detect 301.
When the screen protection action is set to close (step 101), as shown in Figure 1, other event handlings (step 105) of execution are set by system default.
Embodiment two:
Identical with embodiment one, when the screen protection action was set to open, the user can select any one of screen protection action as required, and this embodiment moves this screen protection action of pixel with initial selected and sets forth.
First kind of judged result: if display image is a still image 402, then function control unit 202 is carried out the screen protection action of this scheme, even image whole several pixels that move upwards, downwards, to the left or to the right in certain frequency.In the reality, the resolution of the LVDS signal pattern that comes out from processor is than the resolution height of screen, so screen is full screen display when display image, only also has the sub-fraction image beyond platen edge, be not revealed (parts of images that does not show can be handled with the Scaler algorithm), and we are when calculating every two field picture, the capital defines the row of pixel in the upper left corner of this frame, position (routine H_POSITION/V_POSITION), field, the row of other pixel that mutually should two field picture, the position, field can be calculated by H_POSITION/V_POSITION and be got, therefore display image is in the process that constantly refreshes, as long as (for example H_POSITION+=2 V_POSITION+=2) just can realize moving of each pixel of image to the value of change H_POSITION/V_POSITION.Move in the process of several pixels in integral image, the luminotron of luminescence unit inside can be very of short duration extinguish once, because the visual persistence of human eye, this of short duration human eye that extinguishes is to be difficult to aware, thereby the luminotron by luminescence unit inside light on and off is off and on controlled picture level preferably, make luminotron get back to original state in impaired less situation, then continue luminous, so just can avoid the luminotron of screen luminescence unit inside to be in illuminating state for a long time effectively, improve the ghost phenomena of screen, improve the serviceable life of screen.In this case, the screen protection action is carried out always, has received other event handling signals up to processor, finishes above-mentioned screen protection action.
Second kind of judged result: if determine display image is dynamic image 401, and in conjunction with shown in Figure 1, then function control unit 202 is not carried out the screen protection action, is provided with by system default and carries out other event handlings, and proceed image state and detect 301.
When the screen protection action is set to close, other event handlings of execution are set by system default.
Embodiment three:
Identical with embodiment one, when the screen protection action was set to open, the user can select any one of screen protection action as required, and this embodiment reduces this screen protection action of level with initial selected and sets forth.
First kind of judged result: if display image is a still image 402, then function control unit 202 is carried out the screen protection action of this scheme, be that processor is by calculating the level of each pixel of screen general image, the VISIBLE LIGHT EMISSION amount of the luminotron of control screen luminescence unit inside reduces in certain hour, certain level ratio, thereby the level of general image is reduced.When picture level is low, the corresponding minimizing of VISIBLE LIGHT EMISSION amount of the luminotron of luminescence unit inside, thus effectively prevented the degeneration of fluorescent powder, to reach the purpose that reduces ghost phenomena and improve the screen life-span, also saved the energy simultaneously.In this case, the screen protection action is carried out always, has received other event handling signals up to processor, finishes above-mentioned screen protection action.
Second kind of judged result: if determine display image is dynamic image 401, in conjunction with shown in Figure 1, then function control unit 202 is not carried out the screen protection action, is provided with by system default and carries out other event handlings, again in conjunction with shown in Figure 3, and proceed image state and detect 301.
When the screen protection action is set to close, other event handlings of execution are set by system default.
Embodiment four:
Identical with embodiment one, when the screen protection action was set to open, the user can select any one of screen protection action as required, and this embodiment sets forth with this screen protection action of initial selected image switching.
First kind of judged result: if display image is a still image 402, then function control unit 202 is carried out the screen protection action of this scheme, in conjunction with shown in Figure 5, it is processor good picture of reading pre-stored from storer, data such as picture or sign, and in processor, carry out various relevant treatment and conversion (as by the Scaler algorithm process etc.) and become other signals, LVSD signal as Digital RGB, switch in a different manner then, signal after finally transforming by processor control is to be implemented in the variation of the display image on the screen, thereby the luminescent properties that effectively prevents the luminotron of screen luminescence unit inside is degenerated, so also improved simultaneously the ghost phenomena of screen, improved screen serviceable life at the visual demand that satisfies human eye.In this case, the screen protection action is carried out always, has received other event handling signals up to processor, finishes above-mentioned screen protection action.
Second kind of judged result: if determine display image is dynamic image 401, in conjunction with shown in Figure 1, then function control unit 202 is not carried out the screen protection action, is provided with by system default and carries out other event handlings (step 105), again in conjunction with shown in Figure 3, and proceed image state and detect 301.
When the screen protection action is set to close, other event handlings of execution are set by system default.
In use of the present invention, the user can select different screen protection actions as required, can select in the above-mentioned screen protection action any one, also can select among above-mentioned four kinds of screen protections action any two or more on time shaft, make up, in a word, use this invention can improve the ghost phenomena of screen, improve the serviceable life of PDP display.
Claims (10)
1. a method for protection of plasma television screen is characterized in that, comprises the following steps:
A1) the shown display image of screen is analyzed, judged whether described display image is still image;
A2) if judging described display image is still image, then carry out the screen protection action, change the state of each luminescence unit of screen.
2. method according to claim 1, it is characterized in that, at described step a1) in, data and next frame the data in frame buffer of described display image present frame in internal memory are compared, if data are identical, represent that then this present frame is identical with the next frame image, judge that described display image is a still image; If the data difference represents that then this present frame is different with the next frame image, judge that described display image is a dynamic image.
3. method according to claim 2 is characterized in that, at described step a1) in, timer is set, a variable T is carried out assignment, initial value is T=0; Data and next frame the data in frame buffer of present frame in internal memory to T=0 described display image constantly compare, if the data difference, promptly described display image is a dynamic image; If data are identical, represent that then the display image of present frame and next frame is identical; Then, T increases a chronomere, T=1, continuation compares the data and the data of next frame in frame buffer of present frame in internal memory of this T=1 described display image constantly, if data are identical, T increases a chronomere again, T=2, again T=2 data and next frame the data in frame buffer of present frame in internal memory are constantly compared, carry out so successively, up to T=n-1, T=n-1 data and next frame the data in frame buffer of described display image present frame in internal memory are constantly compared, if data are identical, promptly described display image is a still image, and T is reset to T=0 with variations per hour.
4. method according to claim 1, it is characterized in that, at described step a2) in, when carrying out the screen protection action, the VISIBLE LIGHT EMISSION amount of the luminotron by changing described display image luminescence unit inside changes the display brightness of each luminescence unit, perhaps changes the displaying contents of each luminescence unit by the video data that changes storer.
5. method according to claim 4, it is characterized in that, described luminotron is intermittently luminous to be realized with extinguishing the VISIBLE LIGHT EMISSION amount of the luminotron of described change display image luminescence unit inside by making, and perhaps realizes by the VISIBLE LIGHT EMISSION amount of luminotron that reduces the luminescence unit inside of described display image in certain hour, certain level ratio after the overall level of adding up described display image; Perhaps, the video data of described change storer is by processor storer to be read and write video data to realize, and the data transfer mode of storer and processor is parallel transmission, perhaps is serial transmission.
6. method according to claim 1 is characterized in that, described screen protection action comprises at least that secret note refreshes, mobile pixel, reduce in level and the image switching any one; This method also comprises step a3): the screen protection action is set is opening, and select corresponding screen protection action.
7. according to the described method of claim 6, it is characterized in that, secret note refreshes and comprises following steps: form a secret note by the OSD engine on described screen, and control described secret note and move to the other end from an end of described screen, make the luminotron of luminescence unit inside of the described screen brushed by described secret note close, thereby make this parts of images level in the number time, keep certain numerical value, and when level was minimum, the luminotron of this part display image luminescence unit inside kept extinguishing state.
8. method according to claim 6, it is characterized in that, described mobile pixel comprises: the row of each pixel by changing described display image simultaneously, a position, whole described display image is moved several pixels upwards, downwards, to the left or to the right, in the process of whole mobile several pixels of display image, the luminotron of luminescence unit inside can extinguish once.
9. method according to claim 6, it is characterized in that described reduction level comprises: reduce the general image level by the VISIBLE LIGHT EMISSION amount that changes the luminotron of display image luminescence unit inside in certain hour, certain level ratio behind the level that calculates described each pixel of display image.
10. method according to claim 6 is characterized in that, described image switching comprises: by regularly the data of exquisite picture, picture, sign or animation segment being replaced the current video data of storer, change the displaying contents of described screen.
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| CN 200910106653 CN101866610A (en) | 2009-04-15 | 2009-04-15 | Method for protection of plasma television screen |
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| CN 200910106653 CN101866610A (en) | 2009-04-15 | 2009-04-15 | Method for protection of plasma television screen |
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