CN100412921C

CN100412921C - Image display device and method for preventing image retention of frame

Info

Publication number: CN100412921C
Application number: CNB2004100213038A
Authority: CN
Inventors: 李东俊; 金东铉
Original assignee: LG Electronics Nanjing Plasma Co Ltd
Current assignee: LG Electronics Nanjing Plasma Co Ltd
Priority date: 2004-02-26
Filing date: 2004-02-26
Publication date: 2008-08-20
Anticipated expiration: 2024-02-26
Also published as: CN1661656A

Abstract

The present invention relates to an image display device for preventing thermalization and image retention and a picture image retention preventing method thereof. The method comprises the following stages: judging whether still image signals above a set time can be input into the image display device or not; if the signals can not be received, judging whether a user needs to select a set menu or not; if the signals can be received or the user selects the set menu, calculating the boundary position value of a picture; if the boundary position value of the picture is calculated and the user selects a picture image retention preventing function, preventing the picture image retention from generating by using a set method. No matter which one of a still picture, ARC regulation, PIP, POP and DW is selected, the image retention and the thermalization of the boundary position can be prevented in advance, and the reduction of the quality of the picture can be suppressed. The present invention can also be applied to stock PIP pictures, panorama pictures, ARC pictures which can be used for displaying the practical proportion of film pictures, etc., and the satisfaction of users can be improved.

Description

Image display and damaged picture preventing method thereof

Technical field

The present invention relates to a kind of image display, especially as plasma display (Plasma DisplayPanel: be designated hereinafter simply as PDP), on the feature of display device, in the image display that image retention might take place, can remove to prevent or eliminate the image display and the damaged picture preventing method thereof of image retention effectively.

Background technology

In suchlike image display, television receiver is the broadcast singal that receives from the broadcasting station, to select the broadcast singal in radio station according to the channel that the user selects, and it is carried out after the demodulation, separate sound and image, after again sound and image being handled respectively accordingly, remove a kind of equipment of output image by picture and loudspeaker.Its kind has the CRT (cathode-ray tube (CRT)) that the most generally uses usually; In addition, in order to satisfy the demand of the big characteristics of pictures of high image quality, utilize LCD (LCD) in addition, the TV of PDP etc.

Particularly, with regard to the PDP TV, on its design feature, compare with traditional CRT, can do very thinly, meanwhile more superior on the brightness characteristics compared with LCD, thereby can satisfy gordian technique well as TV; In addition, particularly outstanding is to hang the wall setting, therefore attracted attention by the people as striding the TV in epoch.

But,, show specific word for a long time as the industry product, when perhaps wide picture being arranged to for a long time show at 4: 3, the LCD product group will stay long image retention at boudary portion, and resemble the situation of PDP, to make the discharge cells thermalization, and can cause fatal infringement to product.

In addition, most image display imposes reverse voltage by every line or each pixel, and its result will also can impose reverse voltage to each.Yet, be optimal if at this moment common voltage is identical, but in fact voltage difference can take place in what; Owing to this reason, add the reason of external environment condition again, the thermalization of image retention and picture unit will take place, and this still frame will produce image retention or thermalization when being shown for a long time.

Shown in Fig. 1 (a) to (d), if continue to carry out ARC (Aspect Ratio Control) function, or show two windows (DW), perhaps select menus such as PIP, or POP, image retention or picture thermalization may appear so.

So as the countermeasure to this type of phenomenon, traditional method is as at picture shown in Figure 1, the speed that picture integral body can't be felt with the user moved with certain cycle.This move can be set to a left side → down → right → on ... Deng the order circle that draws move, also can be set to only move to the left and right.

As seen from the above description, the image display of conventional art exists following problem.

The first, use the image display of the display module of LCD or PDP etc., when going to show still frame for a long time, thermalization will take place.

When the second, selecting ARC, PIP, POP and DW, at the picture boudary portion image retention and thermalization will take place.

Three, in order to prevent image retention and thermalization, use with some cycles left/right/on/following moving image method, but under the situation of still frame, this moment moves, and eyes can be felt to obtain, simultaneously, in can not the image display of overscanning, also will be obvious between the blanking zone of picture.

Summary of the invention

If the present invention provides a kind of still frame that goes to show more than the stipulated time in order to solve the problems of the technologies described above, or the user selects among PIP (picture-in-picture), POP (picture out picture) or the DW (two windows) any one, form thermalization at boudary portion so and prevent band, thereby thermalization and image retention can be taken precautions against image display and damaged picture preventing method thereof in possible trouble.

In order to solve the problems of the technologies described above, the present invention is achieved in that it comprises internal memory and display module, it is characterized in that it has following structure: be provided with the keyboard input part that can select set menu by user intention; Be provided with the picture signal input part that is used for receiving analog rgb (RGB) picture signal or digital rgb picture signal; Be provided with microcomputer, when the picture signal that receives by the picture signal input part shows that with still frame the stipulated time is above on display module, or when the user when the keyboard input part choice menus, prevent image retention and thermalization phenomenon on the picture boudary portion by the method for having set; Be provided with image processing part, it will be mixed with the picture signal that receives from the picture signal input part, and it is processed into a signal that can show on display module according to the control signal of microcomputer.

To achieve the above object, the damaged picture preventing method of image display of the present invention is characterized in that it has the following stage: be provided with and be used for judging a stage that whether receives the rest image signal more than the stipulated time in image display; Do not receive above rest image signal of stipulated time if be provided with, will go so to judge whether the user has selected the stage of set menu; Received above rest image signal of stipulated time if be provided with, perhaps the user has selected set menu, so just goes to calculate the stage of this picture boundary portion place value; Calculate picture boundary portion place value if be provided with, and the user selected damaged picture to prevent function, so just prevented the stage of damaged picture with established methodology.

Image display of the present invention and damaged picture preventing method thereof have following advantage and effect:

The first, no matter in still frame, ARC adjustment, PIP, POP, DW, which is selected, will on boudary portion, can take precautions against the generation of damaged picture and thermalization phenomenon in advance.

The second, prevent the generation of damaged picture, image quality reduction can be taken precautions against in possible trouble.

Three, can not only be applied in existing picture display process, in addition also can be applicable to security PIP, panorama and can demonstrate on the picture of ARC etc. of actual film aspect ratio, thereby have the effect that improves user satisfaction.

Description of drawings

Fig. 1 comes image display device damaged picture instance graph according to conventional art.

Fig. 2 is an image display structured flowchart of the present invention.

Fig. 3 is the process flow diagram according to image display damaged picture preventing method of the present invention.

Fig. 4 is the instance graph according to image display damaged picture preventing method of the present invention.

Among the figure, 100: keyboard input part, 200: picture signal input part, 300: microcomputer, 400: image processing part, 500: display module.

Embodiment

Below, with reference to accompanying drawing image display of the present invention and damaged picture preventing method thereof are more specifically illustrated.

Fig. 2 is the structured flowchart of image display of the present invention; Fig. 3 is the process flow diagram of image display damaged picture preventing method of the present invention.

Image display of the present invention as shown in Figure 2, it is made of following several sections, is provided with the keyboard input part 100 by the user intention choice menus that is:; Be provided with the picture signal input part 200 that is used for receiving analog rgb picture signal or digital rgb picture signal; Be provided with microcomputer 300, if picture signal by 200 receptions of picture signal input part, at the image that shows on the display module more than the stipulated time, if perhaps the user selects set menu by keyboard input part 100, this microcomputer will prevent image retention and thermalization phenomenon on the picture boudary portion by establishing method so; Be provided with image processing part 400, it will mix with the picture signal that receives from picture signal input part 200, and it is processed into the signal that can show on display module by the control signal of microcomputer 300; Be provided with the display module 500 that is used for showing by image processing part 400 treated picture signals.

After image display inserts power supply, if the user has selected set menu (ARC adjustment, PIP, POP, DW) by keyboard input part 100, if perhaps received the above rest image that exceeds schedule time, microcomputer 300 will detect this situation so, and calculate the boundary portion place value of boudary portion.

Then, for image retention and the thermalization that prevents to take place,, according to the method for having set, the image retention and the thermalization phenomenon of picture boudary portion will be gone to prevent to calculate so if the user selects damaged picture to prevent pattern by keyboard input part 100 at the picture boudary portion.

If with reference to accompanying drawing 3, to having the present invention of said structure, promptly the damaged picture preventing method of image display describes, and should go so at first to judge whether power supply opens (S11).

Judged result (S11) if be in the state of opening power, will go to show the picture signal (S12) of reception so.

Then, will judge whether received picture signal is still frame (S13).

Judged result (S13) is if still frame so just goes to judge whether to have surpassed the stipulated time (S14).

Judged result (S14) if surpassed official hour, is so just gone computation bound position value (S15).

In addition, the judged result of front (S13), if received signal is not a still frame, should remove to judge whether to select some among ARC (aspect ratio control), DW, PIP and the POP so, if selected wherein some, should similarly go so to carry out (S15) stage (S16).

Then, judge whether the user has selected image retention to prevent pattern (S17).

Then, judged result (S17) if the user has selected image retention to prevent pattern, is shown (S18) with the picture signal that receives by this selection so.

In addition, judged result (S17) if the user does not select image retention to prevent pattern, on the boudary portion that calculates, prevents image retention and thermalization (S19) by the method for having set so.

Then, will judge whether to have closed image retention and prevent function (S20).

Judged result (S20) prevents function if closed image retention, finishes (S21) after judging whether to have closed power supply so again.

In addition, judged result (S20) does not prevent function if close image retention, continues to carry out image retention so and prevents function, meanwhile goes display image signals (S22).

Also have, judged result (S16) is not if the user selects some among ARC adjustment, DW, PIP and the POP, the picture signal (S23) that demonstration all over the screen is received so.

As mentioned above, image display damaged picture preventing method of the present invention, if the above at the appointed time still frame that shows, if perhaps the user has selected some among ARC adjustment, PIP, POP, the DW, so as shown in (a) to (c) of Fig. 4, to on each boudary portion, form image retention and picture thermalization and prevent band, and solve whereby.

That is to say, a perpendicular line is shown as a plurality of gray scale bands, perhaps the perpendicular line with set number alternately is shown as a plurality of gray scale bands.

Give an example now and describe.Have on the wide cut picture of 1280 * 768 resolutions, if the user selects ARC to adjust menu, so can only be with 4: 3 ratio display frame, and resolution should be made as 1024 * 768, if so be (0 with the setting coordinate of left side tower, 0), will just can have movable pixel from (127,0) beginning so.

For this reason, image retention and thermalization prevent with situation under, should make it from (126,0) place begins, and is vertically generated, therefore, begin to move-1 one by one from this place, and, as shown in Fig. 5 (a), bring with a plurality of gray scales alternately to allow it show with the perpendicular line of set gray scale.Then, between the blanking zone on right side, begin from (1152,0) are interval similarly, set out image retention and thermalization and prevent band, and, the X coordinate is moved+1 one by one from this place, and, bring with a plurality of gray scales alternately to allow it show with the perpendicular line of the set number of boudary portion.

In addition, do not use under the situation of band, in the scope with (with whole when the being considered as 256 grades) degree with 90～140 of the background color between blanking zone, according to the time of setting, as shown in Fig. 5 (b) like that, go to change its rank, thereby also can obtain similar effect.Not using whole rank here is to bring inconvenience for fear of the eyes of giving the user.

Also have, if the user selects the menu of PIP, POP, DW etc., can on a perpendicular line, generate band so, and then go to change its rank, perhaps will go to set different separately ranks on the perpendicular line of set number respectively, can go then to adopt to make this method that road wheel stream (rotation) replaces of bringing into.

Claims

1. the damaged picture preventing method of image display is characterized in that it has the following stage:

Be provided with and be used for judging a stage that in image display, whether receives the rest image signal more than the stipulated time;

Do not receive above rest image signal of stipulated time if be provided with, will go so to judge whether the user has selected the stage of set menu;

Received above rest image signal of stipulated time if be provided with, perhaps the user has selected set menu, so just goes to calculate the stage of this picture boundary portion place value;

Calculate picture boundary portion place value if be provided with, and the user selected damaged picture to prevent function, simultaneously the picture boudary portion has been carried out many gray scales and show the stage that prevents damaged picture with regard to increasing and decreasing so with picture boudary portion coordinate.

2. the damaged picture preventing method of image display according to claim 1, it is characterized in that the described stage that prevents damaged picture is provided with generation damaged picture band, and, in the interval of regulation, go to increase and decrease the stage that a perpendicular line comes mobile right and left coordinate one by one with the right and left coordinate of the picture boudary portion of calculating.

3. the damaged picture preventing method of image display according to claim 2 is characterized in that the described stage that prevents damaged picture is provided with a perpendicular line to be shown as a plurality of gray scale bands or the perpendicular line of set number alternately is shown as the stage that a plurality of gray scale bands are represented the picture border.