1322976 九、發明說明： 【發明所屬之技術領域】 本發明係涉及一種電漿顯示器（PDP)烙痕之減輕改善方法，特別是指一 種藉由主動偵測影像晝面中靜止晝素，進以自動減少晝面中靜止部分亮 度’達到主動減輕抑制烙痕之創新設計者。 ~ 【先前技術】1322976 IX. Description of the Invention: [Technical Field] The present invention relates to a method for improving the hardness of a plasma display (PDP), and particularly to a method for actively detecting a static element in an image surface. Automatically reduce the brightness of the static part of the kneading surface' to achieve an innovative designer to actively reduce the suppression of the mark. ~ [Prior technology]
士按，電漿顯示器(Plasma Display Panel)為目前大尺寸平面顯示器的主 流，其具備有大畫面、高畫質、廣視角、低輻射以及厚度薄等優點；然而， 電，顯不器目前仍存在烙痕(ImageSticking)的問題，亦即，當電漿顯示器顯 示靜態畫面-段時間之後’其晝面巾的影像會產生殘留現象，此如第;圖 所示’當電聚顯示H ( ；L 〇 ) ·點亮一 PDP的字樣（2 〇 a )，使其經過一段 時間顯示’接著讓電漿顯示器顯示暗畫面(如帛2圖所示)或是全白晝面(如 第3圖所示)時，先前的pDp字樣將殘留在畫面上而形成前述之烙痕（2 〇 b)、（2 0 c)，此為目前電漿顯示器上普遍存在的問題。 _基於上述問題，目職界已碰ώ數種解決方法，有關胃知改善 顯示器烙痕之方法及缺點茲分述如下： 晝面=移法.係於靜止畫面時每隔幾秒或幾分鐘讓畫面上下左右或斜 、σ平移歲個畫素，藉此以避免影像固定停在某個位置上；惟，此一 =於實際制上效果並不佳，因為當利職晝面平移法移動畫面時 :移動極4量的晝素，否則使用者容易看出畫面移動時的抖動或造 、面邊界移it}顯示區的情形，如第丨_揭之顯示pDp字體大小即 p因相當大面積的畫素，使得小幅度的畫素平移並無法讓原本 予移到不發光的暗區，也就是說，縣1圖的畫面顯示狀態 马，，、=止畫面利用畫面平移法並無法改善烙痕現象。 :反，法：係利用灰階反轉的影像使電漿顯示器的整個晝面能 圖;所li點亮而達到特性均勻的目的，進而減輕烙痕現象；例如第1 同PDP"T^PDP字體®形點亮—斷_後，再使其以-白底黑字相 子體的晝面點亮一段時間，以平衡面板特性進而減輕烙痕現 2. 象，然而此一方法存在以下問題： a•無法精準確定灰階反轉的時間，當影像反轉時間過長時可能造成另 —方向的烙痕。 b•無法完整產生靜止晝面的灰階反轉影像，例如收看如Bshi電台的 廣播節目時，Bshi的字樣會長時間出現在畫面的右上角，一段時間 後該右上肖即會產生Bshi麟痕，而這種情況下，並無法只產生 3 BShi字體的灰階反轉影像來減輕烙痕現象。 2色跑動條塊畫面清除法：侧用白色跑_條塊左右或是上下往復 動’透賴似雨刷清_水的方式來朗清祕痕之目的，惟，此 方法顯紐在影像晝面上丨現條狀移觸光影，造錢的 感。 而白畫面‘”、機法.主要係藉由全白畫面熱機的方式，讓整個影像畫 趨於致’㈣’以這財_輕烙痕齡通常需要熱機很長 時間’且減輕烙痕現象的效果並不如預期。 是以’針對上述習知電漿顯示器使用上所存在之問題點，如 =研發出—種減降效果更佳、更具理想實用性之創新影像烙痕減 !改善方法’實為業界需再加以思索突破之重要課題。 „：：：； ： ^ 【發明内容】 卩本發明之主要目的，係在提供—觀麵示器⑽)影像烙痕之減 善方法’其所欲解決之問題點，係雌料改善《顯示痕之方 法如畫面平移法、影像灰階反縣、白色跑動條塊晝面清除細及全白查 面熱機法仍存迦⑽各種料㈣及嶋輪術 佳之問題點加以改良突破； 而本發明解決問題之技術特點其較佳實施例係 包括轉換單元、靜止畫面偵測單元 畫面亮度調整單元、灰階數提昇及灰 1¾冗度轉換早4第四_分；其巾鮮元鋪靖輸人訊號的灰階 …。度_轉換成線賴係，制於明單電路制财歧階值推測預 期亮度值之目的；該靜止畫㈣測單元係晝面暫麵練（Fr_ 驗）記錄時_時的影像，經過-段時馳後再將時間t的影像與時 間t+At _像断比較，以決定畫素巾所呈獅影像是靜止影像或動態影 像；當觸畫素切影像為靜止影料，令亮度機增細償參數為一負 值’若騎晝封的影像為動態影料，令亮賴整增益猶參數為一正 值，該畫面免度調整單从畫面暫存緩衝區記錄每—畫素所對應的增 益值，該所述增益倾著靜止晝面_單元偵_結果進行調整，當靜止 晝面伽單元_到畫素上的影料靜止影糾，㈣面增益暫存緩衝區 中此畫素所對應的增益值加上其所對應的負值亮度增益補償鎌，進以降 低增益值；反之，職晝輯益暫存緩舰中此晝素所對應的增益值加上 其所對應的正絲度增益婦傭而加大細益值；雜輸人的每一 畫素在輸出録以其麟應的增益值後再輸出，即可達咖降靜止影像亮 度之目的；該灰·提昇及灰階亮度轉換單元卿彻增加輸出影像之灰 階表現者；藉此觸鱗設計’由於本發明是主動_電細示器影像畫 面中靜止畫素的部份，進而自動減少畫面中靜止部分的亮度(放電次數），達 到主動抑祕痕之目的，因此對於大面積或是局部性的靜止影像烙痕均能 相同樣的減輕㈣效果，且完全#_f彡像畫_正常親，亦無須 、—’’’、機來'肖除烙痕，達到大幅提昇電細示器效能及品質之實用 進步性。 【實施方式】 善方顯示器，r痕之減輕改 本發^:=:= :=r峨階娜及她=二= 1 (3 Q):其係可將輸人訊號的灰階與亮度關係轉換 、’、，例如傳統的視訊訊號其灰階與所代表的亮度之間呈現 amma :5的關係，此時G_a轉換單元（3 〇 )將輪入訊號進行 t里面^貞，單/° (4 ◦).此單元是利用—畫面暫存緩衝區（4 1 ) p 時間為㈣的影像，經過一段時間姆再將時 t 的影像進行比較，以決定晝素中所呈現的影 祕雜；錢雜止影像酬#絲_ t與時 ^的影像進行低猶波處理以降低雜訊的影響 的影像為靜止職時，令亮賴整增鋪齡數 增益鋪著靜止晝面偵測單元（4 〇 )所翻的結果進 1322976 止旦面偵測單元（4 Ο)偵測到晝素上的影像為靜止影像時，則將畫 面增益暫存緩衝區中此畫素所對應的增益值，加上其所對應的亮度增 盈補償係數C(此時C為負值），藉以降低其增益值；反之，當靜止畫面 伽單元（4 0)個到畫素上的影像麵態影像時，則ς*面增益 暫存緩顺巾此晝素所對觸增益值，加上其所對應的亮度增益^償 係數C(此時c為正值)而能加大其增益值;復將輪入影像的每一畫素在 輸出前乘以其所對應的增益值後再輸出，即可達到調降靜止影像亮度 之目的。在實際應用上，可將單元中畫面增益暫存緩衝區（4 2 記錄的增益值放大256倍(2"倍)，在輪入影像乘以此放大的增益值後， 於輸出刖S除以256後輸ib ;如此，可以提高增益值的解析度及簡化 乘法(除法)所需的硬體資源；在時間剛開始時(t=〇)令增益值為256 , 右晝面為一靜止影像時，經過的時間後增益值為 256-1=255，在時間t = n*At的時間後晝面暫存緩衝區中的增益值降 低為256-n，影像乘以此小於256的增益值後再除以256即可達到降 低靜止畫Φ亮度之目的；反之，當晝面為祕影像時，則提高其所對 應的增益值以回復此區域的影像亮度。為避免亮度調整後造成靜止區 域冗度過低或是動癌區域亮度過高的情形，存在晝面增益暫存緩衝區 (4 2 )中的增益值需給予一個限制，當限制增益值最小為64時可 限制靜止區域亮度降低的最大幅度為縣亮度的1M ,又限制增益值 最大為256可避免動態區域其畫素所對應的增益值在加上亮度增益補 償係數後，會大於256而造成晝面比正常來的亮。 4、灰階數提昇及細亮度轉鮮元（6 Q ):在晝面亮度輕單元（5 0 )會對影像it練法運算，胁触在絲運紐，所產生小 數^份的灰階細節無法直接呈現於顯示器上，為了有效提昇顯示器的 、-田節表現本單元可利用空間的誤差擴散法（Spaciai Dig^si〇n ) 或時間的_法（Dithering)來增加麵影像的灰階表現。 補充說明的是’前述影像灰階在輸出給顯㈤之前，由於電漿顯示器 模組的灰階與亮度(放電次數)之配置不一定是線性關係，為了更精確達到吾 ⑧ 9 1322976 人所翻祕錢輕抑做果，職雄錢^齡s 像灰階與電_綠亮度(放電趙)_的_ 關係能轉線性的關係。 的 【本發明之優點】 本發明對照習知之功效增進事實分析如下： 本發明所揭「電»示n(PDP)·烙痕之_改#方法」主要是藉由 主動_«顯示H影像晝面巾靜止晝素的部份，進而自械少畫面中靜 • 止部分的亮度(放電次數）’達到主動抑制烙痕之目的，因此對於大面積或是 局部性的靜止影像烙痕均能達到同樣職輕抑制效果，且完全不會影響影 像晝面的正常顯現，亦無須以全白畫面熱機來消除絡痕，確可改善解決【先 前技術】中所提各項習知方法之缺弊，達到大幅提昇電聚顯示器效能及品 質之實用進步性。 上述實施賴_者_以具舰縣發明，且文中雖透過特定 • 語進行說明，當不能以此限定本新型發明之專利範圍；熟悉此項技術領域 之人士當可在瞭解本發明之精神與原則後對其進行變更與修改而達到 ，目的’而此等變更與修改，皆應涵蓋於如后所述之申請專利範圍所界定 10 1322976 【圖式簡單說明】 第1圖：係一般電漿顯示器正常顯示畫面之平面示意圖。 第2圖：係承第1圖，電漿顯示器顯示暗畫面而出現烙痕之示意圖。 第3圖：係承第1圖，電漿顯示器顯示全白晝面而出現烙痕之示意圖。 第4圖：係本發明較佳實施例之系統流程簡示圖。 【主要元件符號說明】 習知部分： (10) (20a) (20b)(20 c) 電漿顯示器 字樣 烙痕 本發明部分： 轉換單元 （30) 靜止晝面偵測單元 （40) 晝面暫存緩衝區 （41) 晝面增益暫存緩衝區 （42) 晝面亮度調整單元 （50) 灰階數提昇及灰階亮度轉換單元 （60) 11Plasma Display Panel is the mainstream of large-size flat panel displays. It has the advantages of large screen, high image quality, wide viewing angle, low radiation and thin thickness. However, electricity and display are still in use. There is a problem of ImageSticking, that is, when the plasma display shows a static picture - after a period of time, the image of the face towel will have a residual phenomenon, as shown in the figure; when the picture shows 'H"; 〇) · Light up a PDP (2 〇a ) to display it over a period of time 'then let the plasma display show a dark picture (as shown in Figure 2) or a full white face (as shown in Figure 3) When the previous pDp typeface remains on the screen to form the aforementioned indentation (2 〇b), (20c), this is a common problem on current plasma displays. _ Based on the above problems, the target industry has encountered several solutions. The methods and shortcomings of improving the display mark on the stomach are described as follows: 昼面=移法. Every few seconds or minutes when the picture is still. Let the screen move up, down, left, right, or diagonally, and sigma, to prevent the image from being fixed at a certain position. However, this one is not effective in the actual system, because when the job is moved, the translation method is moved. At the time of the screen: move the 4 elements of the pole, otherwise the user can easily see the jitter or the boundary of the screen when the screen moves, and the display area of the screen. For example, the size of the pDp font is the size of p. The pixel of the area makes the small-scale pixel shifting and cannot be moved to the dark area where the light is not emitted. That is to say, the picture of the county 1 picture shows the state of the horse, and the image is not improved by the screen shift method. The phenomenon of branding. :Reverse, method: the gray-scale inverted image is used to make the entire surface of the plasma display visible; the illumination is lit to achieve uniformity of properties, thereby reducing the risk of flaws; for example, the same PDP"T^PDP The font® shape is lit—breaking _, and then it is illuminated for a period of time with the white surface of the black-and-white phase of the white body to balance the panel characteristics and thus reduce the soldering. 2. However, this method has the following problems. : a• The time of grayscale inversion cannot be accurately determined. When the image reversal time is too long, it may cause another direction of the mark. b• The grayscale inversion image of the stationary surface cannot be completely generated. For example, when watching a broadcast program such as Bshi Radio, the word Bshi will appear in the upper right corner of the screen for a long time. After a period of time, the right upper corner will produce Bshi. In this case, it is not possible to generate only the grayscale inversion image of the 3 BShi font to reduce the sticking phenomenon. 2 color running bar screen clearing method: side running with white _ strip left or right or reciprocating motion 'through the rain like clear _ water way to clear the secret mark, but this method is in the image 昼On the surface, the strips touch the light and shadow, creating a sense of money. The white screen '", the machine method. Mainly by means of the all-white screen heat engine, so that the entire image painting tends to '(four)' with this wealth _ light-burning marks usually require a long time heat engine' and reduce the phenomenon of branding The effect is not as expected. It is based on the problems in the use of the above-mentioned conventional plasma display, such as = developed - innovative image reduction with better reduction effect, more ideal and practicality! 'There is an important issue that the industry needs to think about and break through. „:::; ^ 【Contents of the Invention 卩 The main purpose of the present invention is to provide a method for reducing the image mark of a face-to-face display (10). The problem to be solved is the improvement of the female material. The method of displaying the mark, such as the screen shifting method, the gray scale of the image, the anti-county, the white running block, the surface cleaning, and the all-white hot surface method are still preserved. (10) Various materials (4) And the problem of the problem is better improved; and the preferred embodiment of the present invention includes a conversion unit, a still picture detection unit picture brightness adjustment unit, a gray level increase, and a gray level conversion early. 4th Four _ points; the gray level of the towel Degree_converted into a line-dependent system, which is used for the purpose of estimating the expected brightness value of the single-circuit circuit financial disparity value; the image of the static picture (four) measurement unit system is temporarily immersed (Fr_ test) when recording, after - After the segment, the image of time t is compared with the time t+At _ image to determine whether the lion image of the keratin towel is a still image or a moving image; when the touch image is a still image, the brightness machine The parameter of the increase and decrease is a negative value. If the image of the rider is a dynamic shadow, the brightness is adjusted to a positive value, and the screen is adjusted from the picture buffer to record each pixel. Corresponding gain value, the gain is tilted to the stationary surface _ unit _ result to adjust, when the stationary 伽 伽 单元 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到The gain value corresponding to the prime is added to the corresponding negative value brightness gain compensation 镰 to reduce the gain value; otherwise, the gain value corresponding to the element in the temporary suspension slow ship is added to the corresponding value. The positive degree gains the maid and increases the value of the benefit; each pixel of the miscellaneous input is recorded at the output. After the gain value of the lining should be output, it can achieve the purpose of reducing the brightness of the still image; the gray-up and gray-scale brightness conversion unit clears the gray-scale expression of the output image; The invention is a part of the static pixel in the active image display, thereby automatically reducing the brightness (discharge number) of the still part in the picture, and achieving the purpose of actively suppressing the secret mark, so that for a large area or a partial static The image flaws can alleviate the same (four) effect, and completely #_f彡像画_ normal pro, no need, - ''', machine to 'xiao remove the mark, to achieve a significant improvement in the performance and quality of the electric display Practical and progressive. [Embodiment] Shanfang display, the reduction of the r mark is changed to ^:=:= :=r峨峨娜和她=二=1 (3 Q): The system can change the gray scale and brightness of the input signal Conversion, ', for example, the traditional video signal has an amma:5 relationship between the gray level and the brightness represented. At this time, the G_a conversion unit (3 〇) will turn the signal into t, ^/° ( 4 ◦). This unit uses the image buffer (4 1 ) p time (4) image, after a period of time, then compare the image of the time t to determine the shadows presented in the element; The image of the image of the money _ t and the image of the time is low, and the image of the image is reduced to reduce the influence of the noise. The image is a stationary position, and the gain of the grading is increased. 4 〇) The result of the flipping into the 1322976 detecting surface detection unit (4 Ο) detects that the image on the pixel is a still image, then the gain value corresponding to the pixel in the picture gain buffer buffer is In addition, the corresponding brightness gain compensation coefficient C (where C is a negative value), thereby reducing its gain value; When the element (40) is on the image surface image on the pixel, the 增益*-face gain temporary buffer is used to adjust the gain value of the element, and the corresponding brightness gain compensation coefficient C (this When c is positive, it can increase its gain value; each pixel of the wheeled image is multiplied by its corresponding gain value before output, and then output, to achieve the purpose of reducing the brightness of the still image. In practical applications, the picture gain buffer can be buffered in the unit (the gain value of the 4 2 record is amplified by 256 times (2" times), and the output 刖S is divided by the rounded image multiplied by the amplified gain value. After 256, input ib; in this way, the resolution of the gain value can be improved and the hardware resources required for multiplication (division) can be simplified; at the beginning of time (t=〇), the gain value is 256, and the right side is a still image. When the elapsed time, the gain value is 256-1=255. After the time t = n*At, the gain value in the buffer buffer is reduced to 256-n, and the image is multiplied by the gain value less than 256. After dividing by 256, the purpose of reducing the brightness of the still picture Φ can be achieved; conversely, when the picture is a secret image, the corresponding gain value is increased to restore the image brightness of the area. To avoid the static area caused by the brightness adjustment If the redundancy is too low or the brightness of the cancerous area is too high, there is a limit to the gain value in the face gain buffer buffer (4 2 ). When the limit gain value is at least 64, the brightness of the still area can be limited. The maximum amplitude is 1M of the county brightness, and the maximum gain value is limited. For 256, the gain value corresponding to the pixel of the dynamic region can be avoided, and after adding the brightness gain compensation coefficient, it will be greater than 256, which causes the kneading surface to be brighter than normal. 4. Gray scale number enhancement and fine brightness conversion (6) Q): In the face lightness unit (50), the image will be practiced, and the grayscale details generated by the touches will not be directly displayed on the display, in order to effectively enhance the display. -Tianjie performance This unit can use the space error diffusion method (Spaciai Dig^si〇n) or the time method (Dithering) to increase the grayscale performance of the surface image. The supplementary explanation is that the above image gray scale is output to Before (5), because the gray scale and brightness (discharge number) of the plasma display module are not necessarily linear, in order to more accurately achieve the mystery of the money s The relationship between the gray level and the electric_green brightness (discharge)_ can be changed to a linear relationship. [Advantages of the Invention] The present invention compares the conventional effect enhancement fact analysis as follows: (PDP) · Branding _ change # method" is mainly The active _« shows the portion of the H image 昼 face towel that is stationary, and then the brightness (discharge number) of the static part of the image is reduced to the purpose of actively suppressing the mark, so for large area or locality The still image can be used to achieve the same effect of suppressing the lightness of the image, and it does not affect the normal appearance of the image surface. It does not need to use the full white screen heat machine to eliminate the crease marks. It can improve the solutions mentioned in [Prior Art]. The shortcomings of the conventional methods have greatly improved the practical and progressive performance of the performance and quality of the electro-polymer display. The above-mentioned implementation is based on the invention of the ship, and the text is described in the specific language. Scope of the invention; those skilled in the art can change and modify the spirit and principles of the invention, and the changes and modifications should be included in the following description. 10 1322976 as defined in the scope of application for patents [Simple description of the drawings] Figure 1: A schematic plan view of the normal display screen of a general plasma display. Figure 2: A diagram showing the appearance of a mark on a plasma display showing a dark picture. Figure 3: In the first picture, the plasma display shows the appearance of a white mark on the face. Figure 4 is a schematic diagram of a system flow in accordance with a preferred embodiment of the present invention. [Main component symbol description] Conventional part: (10) (20a) (20b) (20 c) Plasma display typeface branding. Part of the invention: Conversion unit (30) Static surface detection unit (40) Memory buffer (41) Face gain buffer buffer (42) Face brightness adjustment unit (50) Gray level increase and gray level brightness conversion unit (60) 11