CN1753062A - Brightness compensation device of plasma display panel and method - Google Patents
Brightness compensation device of plasma display panel and method Download PDFInfo
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- CN1753062A CN1753062A CNA2004100504673A CN200410050467A CN1753062A CN 1753062 A CN1753062 A CN 1753062A CN A2004100504673 A CNA2004100504673 A CN A2004100504673A CN 200410050467 A CN200410050467 A CN 200410050467A CN 1753062 A CN1753062 A CN 1753062A
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Abstract
The invention relates to a brightness compensating device and method for plasma display panel (PDP), especially relating to a brightness compensating device and method able to prevent the problem that the same-brightness signals produces different brightnesses by load effect phenomenon. The device comprises: A/D conversion part for make A/D conversion on input picture signals; a scaler for making module resolution and image frequency suitable for vertical frequency; a frame memory for converting vertical image frequency; a picture regulating part for regulating contrast and brightness values to ones the user desires; a control part for controlling the A/D conversion part, scaler, frame memory and image regulating part and simultaneously reading distributed values of image brightnesses and calculating grade compensation value of mean brightness value and finally making control by the grade compensation value. The advantage is that the invention can prevent the problem that the same-brightness signals produce different brightnesses by load effect phenomenon.
Description
Technical field
The present invention relates to a kind of luminance compensating mechanism and method of plasma display panel, relate in particular to a kind of can preventing because load effect (LOAD-EFFECT) phenomenon causes the luminance compensating mechanism and the method for the plasma display panel that makes the same brightness signal demonstrate brightness inequality.
Background technology
When plasma display panel (PDP:Plasma Display Panel) is the vacuum infrared ray impact fluorescence body that produces by gas discharge, utilize the display device of the visible light that fluorophor produces.
Plasma display panel (PDP) is compared thin thickness, in light weight with active cathode-ray tube (CRT) (CRT:Cathode ray Tube) till now, and has the benefit that can realize high distinct big picture, therefore is subject to people's attention.
Plasma display panel is to be made of many discharge cells that the matrix form is arranged, and forms a pixel at a unit.
This plasma display panel normally will be separately discharge cell focus on and form whole picture together, and in discharge cell separately, be to transmit signal, form electrode in horizontal, vertical direction.
In recent years, the big screen plasma display board according to the situation of light optically focused, be to transmit signal, and the length of electrode is prolonged; Just there is the picture position that prolongs according to electrode length in this, and the signal identical to brightness produces brightness problem inequality.
Above-mentioned this phenomenon is load effect, even according to the same electrical polar curve, there is the situation of how many bright signals or dark signal in the same brightness signal of permitting, also produces brightness problem inequality.
Fig. 1 is the desirable illuminometer diagrammatic sketch that plasma display panel is permitted signal; Fig. 2 is the intrinsic brilliance presentation graphs that plasma display panel is permitted signal.
With reference to Fig. 1, Fig. 2 as seen, exist on separately 3 lines in Fig. 1 and permit signal, in this case, if except the length of dark signal, then the size to the allowance signal of other parts is identical.
As shown in Figure 1, desirable plasma display panel is according to identical luminance signal, should be shown as identical brightness, but the brightness that shows on the plasma display panel of reality as shown in Figure 2.
That is, just the length of dark signal is inequality separately, and highlights sub-signal size should be identical, but as shown in Figure 2, the situation long for dark signal length compared with the situation that dark signal length is short, and the luminance signals of highlights branch is shown as brighter comparatively speaking.
Owing to there is this load effect (LOAD EFFECT) phenomenon, therefore along with electrode length prolongs, according to how many differences of load of electrode length line process, brightness inequality also appears in the signal of same brightness; If dark signal long (promptly short, the situation that the load of electrode wires process is few) because of bright signal then the highlights branch be shown as brighter; If dark signal short (promptly because of bright Chief Signal Boatswain, the situation that the load of electrode wires process is many), then bright part is shown as secretly.
Fig. 3 is the 10 types of luminance signals and the brightness measuring location table diagrammatic sketch of plasma display panel; Fig. 4 is the luminance signals mean value of signal type shown in Figure 3 and at the presentation graphs of brightness measuring location declaration brightness.
With reference to Fig. 3, Fig. 4 as seen, at first, signal 1 type is only to permit the situation that bright signal exists on a line in Fig. 3; And signal 10 maximum signal that is dark signals.
As shown in Figure 4, if under the situation of only permitting bright signal existence, the signal averaging of signal 1 type is set at 100, and the signal averaging of the maximum signal 10 of dark signal is set at 10, then for the bright signal in brightness measuring place shown in Figure 3, even if luminance signal has identical size, but also along with dark signal is walked longer and longer (going ahead to signal 10 from signal 1), when finishing dark signal, the luminance signals value of measuring in the place that bright signal begins also increases.
Utilizing greatly about signal averaging is the result that brightness is measured in 50 place (signal 5 types), can confirm that the brightness of measuring represents to be similar to original allowance luminance signals.
As above-mentioned, traditional plasma display panel is the length difference according to dark signal, exists the identical luminance signal of generation and is shown as brightness problem inequality, therefore can not provide the customer satisfaction system high picture quality that has to the user.
Summary of the invention
The present invention is luminance compensating mechanism and the method that provides a kind of plasma display panel for addressing the above problem, and purpose provides and can prevent from brightness inequality to occur because load effect (LOAD EFFECT) phenomenon causes identical luminance signal.
The luminance compensating mechanism of plasma display panel of the present invention is to be made of following structure: the A/D transformation component of the picture signal of input being simulated A/ numeral D conversion; Module resolution and picture frequency are transformed to the scaler that is suitable for vertical frequency; The frame memory of changing image vertical frequency; The image adjustment part that the contrast of image and brightness value is adjusted into contrast that the user wishes and brightness value and is provided with; Control A/D transformation component, scaler, frame memory and image adjustment part are simultaneously, read each the line image Luminance Distribution value that is input in the frame memory, and calculate the grade formula luminance compensation value of average brightness, the control part controlled of application level formula luminance compensation value then.
And the luminance compensation method of plasma display panel of the present invention is to be made of the following stage: the average brightness of each line of picture signal of input is carried out calculation stages; According to each line average brightness of input signal, calculate decision grade formula luminance compensation value, and with offset application stage in input signal; The input signal of using offset is carried out output stage.
Advantageous effect of the present invention:
The luminance compensating mechanism of plasma display panel of the present invention and method can solve by load effect (LOADEFFECT) phenomenon and cause to have the problem that brightness inequality appears in identical luminance signal.
Description of drawings
Fig. 1 is the desirable illuminometer diagrammatic sketch that plasma display panel is permitted signal.
Fig. 2 is the intrinsic brilliance presentation graphs that plasma display panel is permitted signal.
Fig. 3 is the 10 types of luminance signals and the brightness measuring location table diagrammatic sketch of plasma display panel.
Fig. 4 is the luminance signals mean value of signal type shown in Figure 3 and at the presentation graphs of brightness measuring location declaration brightness.
Fig. 5 is the luminance compensating mechanism block diagram of plasma display panel of the present invention.
Fig. 6 is the brightness key diagram in application luminance compensation value shown in Figure 4.
Fig. 7 permits the signal comparison diagram that signal and the present invention use the luminance compensation value in picture signal.
Fig. 8 is the process flow diagram of the luminance compensation method of plasma display panel of the present invention.
To accompanying drawing major part symbol description:
The 10:A/D transformation component; 11: frame memory; 12: scaler; 13: control part; 14: the image adjustment part.
Embodiment
Following with reference to accompanying drawing, the luminance compensating mechanism and the method for plasma display panel of the present invention is described in detail as follows:
Fig. 5 is the luminance compensating mechanism block diagram of plasma display panel of the present invention.
With reference to Fig. 5 as seen, the luminance compensating mechanism of plasma display panel of the present invention is to be made of following structure: the A/D transformation component 10 of the picture signal of input being simulated A/ numeral D conversion; Module resolution and picture frequency are transformed to the scaler 12 that is suitable for vertical frequency and is provided with; The frame memory 11 of changing image vertical frequency; The image adjustment part 14 that the contrast of image and brightness value is adjusted into contrast that the user wishes and brightness value and is provided with; Control A/D transformation component 10, scaler 12, frame memory 11 and image adjustment part 14 are simultaneously, read each the line image Luminance Distribution value that is input in the frame memory 11, and calculate the grade formula luminance compensation value of average brightness, the control part 15 controlled of application level formula luminance compensation value then.
More detailed description is as follows: the image of input carries out being transformed to picture frequency after the A/D conversion in scaler 12 in A/D transformation component 10.The image vertical frequency of input is carried out conversion at frame memory 11; And control part 15 is analyzed line average brightness of back extraction by the image brightness distribution value of 11 pairs of inputs of frame memory.
Then, control part 15, calculates to reducing the offset of load effect as benchmark with average brightness, and is applied in separately the brightness value.
The picture signal of application load effect compensating value in the process through image adjustment part 14, is adjusted into contrast and the brightness value that the user wishes with contrast and brightness value.
The luminance compensating mechanism of above-mentioned plasma display panel is to calculate offset after extracting the brightness of image mean value of importing out, and uses offset and control brightness.Offset is done following more detailed description.
Fig. 6 is the brightness key diagram in application luminance compensation value shown in Figure 4.
For signal 1 type, exist owing to only permit bright signal, so signal 1 is compared with permitting signal, be shown as dark signal.Therefore for make offset become on the occasion of, the allowance signal of new introducing should be bigger than original allowance signal.
On the contrary, for signal 10 types,,, be shown as bright signal so signal 10 is compared with the signal of permitting because major part is a dark signal.Therefore for making offset become negative value, the new allowance signal of introducing should be littler than original allowance signal.
That is, shown in the figure, using the luminance signal figure of offset and the difference of luminance graph is exactly offset, owing to used offset, therefore can compensate the distortion brightness that is caused by load effect.
Have only will corresponding to the offset of signal separately increase to more than certain benchmark on the occasion of, just can bring upwards improving of whole image brightness, also only in this way just can bring and not only can the distortion brightness that be caused by load effect be compensated, and increase whole image brightness simultaneously.
Fig. 7 permits the signal comparison diagram that signal and the present invention use the luminance compensation value in picture signal.
As above-mentioned, use the result of luminance compensation value, for signal 1 type, permit signal and become than the also big signal of allowance signal in the picture signal; And for signal 10 types, permit signal and become than the also little signal of allowance signal in the picture signal.
Fig. 8 is the process flow diagram of the luminance compensation method of plasma display panel of the present invention.
With reference to Fig. 8 as seen, at first, calculate from the picture carrier mean value (S100) of control part input.
Then, calculate the grade formula luminance compensation value of decision, and offset is applied in the input signal (S110) (S120) corresponding to each line mean value of input signal.
If the input signal of offset is used in output, then will export can the minimum loads effect phenomenon picture signal (S130).
Claims (2)
1, the luminance compensating mechanism of plasma display panel is characterized in that it being to be made of following structure:
The picture signal of input is simulated the A/D transformation component of A/ numeral D conversion;
Module resolution and picture frequency are transformed to the scaler that is suitable for vertical frequency and is provided with;
The frame memory of changing image vertical frequency;
The image adjustment part that the contrast of image and brightness value is adjusted into contrast that the user wishes and brightness value and is provided with;
In the time of control A/D transformation component, scaler, frame memory and image adjustment part, read each the line image Luminance Distribution value that is input in the frame memory, and calculate grade formula luminance compensation value, the control part controlled of application level formula luminance compensation value then based on average brightness.
2, the luminance compensation method of plasma display panel is characterized in that being made of the following stage:
The average brightness of each line of picture signal of input is carried out calculation stages;
According to each line average brightness of input signal, calculate decision grade formula luminance compensation value, and with offset application stage in input signal;
The input signal of using offset is carried out output stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNA2004100504673A CN1753062A (en) | 2004-09-21 | 2004-09-21 | Brightness compensation device of plasma display panel and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2004100504673A CN1753062A (en) | 2004-09-21 | 2004-09-21 | Brightness compensation device of plasma display panel and method |
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| CN1753062A true CN1753062A (en) | 2006-03-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101212695B (en) * | 2006-12-26 | 2011-08-31 | 三星电子株式会社 | Apparatus for processing image signal and method for controlling same |
| CN113723393A (en) * | 2021-11-03 | 2021-11-30 | 浙江宇视科技有限公司 | Image acquisition method, image acquisition device, electronic device, and medium |
-
2004
- 2004-09-21 CN CNA2004100504673A patent/CN1753062A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101212695B (en) * | 2006-12-26 | 2011-08-31 | 三星电子株式会社 | Apparatus for processing image signal and method for controlling same |
| CN113723393A (en) * | 2021-11-03 | 2021-11-30 | 浙江宇视科技有限公司 | Image acquisition method, image acquisition device, electronic device, and medium |
| CN113723393B (en) * | 2021-11-03 | 2022-03-18 | 浙江宇视科技有限公司 | Image acquisition method, image acquisition device, electronic device, and medium |
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Owner name: LG ELECTRONICS (NANJING) PLASMA CO., LTD. Free format text: FORMER OWNER: LG ELECTRONICS (SHENYANG) CO., LTD. Effective date: 20070427 |
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Effective date of registration: 20070427 Address after: 210046 No. 77 Hengtong Road, Nanjing economic and Technological Development Zone, Jiangsu Applicant after: LG Electronics (Nanjing) Plasma Co., Ltd. Address before: 110179 35,40, hi tech Development Zone, Liaoning, Shenyang Applicant before: LG Electronic (Shenyang) Co., Ltd. |
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