TWI259991B - Discharge device and discharge method and liquid crystal display using thereof - Google Patents
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1259991 五、發明說明(1) 發明所屬之技術領域 本發明是有關於放電線路與方法,且特別是有關於 與液晶顯示面板(Liquid Crystal Display, nLCD”)之放 電線路與方法。 先前技術 近年來,用於電子設備之顯示裝置,例如電腦螢 幕、電視等,已有重大之發展。相對於傳統之陰極射線 管(Cathode Ray Tube, nCRTn),因為液晶顯示面板具有 重量輕、尺寸薄、面積可大可小、低操作電壓、省電、 以及無輻射線等優點,近年來已成為顯示面板的主流。 近幾年來,流行之可攜帶式電子商品,諸如筆記型電腦 $ 之螢幕、手機螢幕、個人數位助理機(Personal Digital Assistance, nPDAn)之顯示幕等,更是只有液晶螢幕才 能符合重量輕、尺寸薄、小面積等可攜帶式之需求。 傳統上,一液晶顯示面板在其電源突然被關閉時, 會因為其中積體電路(Integrated Circuit, nICn)已經 不動作,使得其X方向之COM端掃瞄線或Y方向之SEG端掃 瞄線之某一條掃瞄線上,仍留存有液晶顯示面板之掃瞄 電壓。但是因為液晶顯示面板電壓的穩壓電容仍然維持 在某一電位上,使得此C 0 Μ端或S E G端之掃瞄線上殘留之 電壓,會維持一段相當長之時間。基本上,此液晶顯示 面板電壓要等到因漏電或經由某一放電路徑才會消失。 〇 一般而言,在殘留電壓維持之時間内,液晶顯示面板上 已經累積了足夠大的均方根(Root Mean Square, nRMSn)BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge line and method, and more particularly to a discharge line and method for a liquid crystal display (nLCD). Display devices for electronic devices, such as computer screens, televisions, etc., have undergone significant development. Compared with conventional cathode ray tubes (Cathode Ray Tubes, nCRTn), liquid crystal display panels are light in weight, thin in size, and available in area. The advantages of large size, low operating voltage, power saving, and no radiation have become the mainstream of display panels in recent years. In recent years, popular portable electronic products, such as the screen of notebook computer, mobile phone screen, The display screen of the Personal Digital Assistance (nPDAn), etc., only the LCD screen can meet the portable requirements of light weight, small size, small area, etc. Traditionally, a liquid crystal display panel is suddenly powered by its power supply. When it is turned off, it will be caused by the integrated circuit (nICn). The scanning voltage of the liquid crystal display panel remains on one of the scanning lines of the COM scanning line in the X direction or the SEG scanning line in the Y direction. However, since the voltage stabilizing capacitance of the liquid crystal display panel voltage is still maintained at some At a potential, the voltage remaining on the scan line of the C 0 terminal or the SEG terminal is maintained for a relatively long period of time. Basically, the voltage of the liquid crystal display panel is not to be lost due to leakage or passing through a certain discharge path. 〇 In general, a large enough root mean square (Root Mean Square, nRMSn) has accumulated on the LCD panel during the period of residual voltage maintenance.
11549twf.ptd 第8頁 1259991 五、發明說明(2) 電壓,而產生了可觀測到之黑線之現象。請參照第1 A圖 與第1 B圖,其係繪示一習知之液晶顯示面板上,殘留電 壓產生黑線之示意圖。 . 為了解決上述問題,傳統的液晶顯示面板上需加上 一放電電路,在其電源關閉時,可以將液晶顯示面板中 · 電容上之電荷快速的放電去掉,而可以消除上述黑線產 生之現象。請參照第2圖,其係繪示一習知之液晶顯示面 板之放電線路之電路圖。其中在一 LCD驅動1C 203中,加 入包括一開關電晶體2 0 6、以及一電阻2 0 8。開關電晶體 2 0 6 ,係透過一驅動開關2 0 4連接到一液晶顯示面板2 0 1中 之所有電容。另外,開關電晶體2 0 6更連接到一外接電容 4 2 1 0。其中液晶顯示面板2 0 1連接到此外接電容2 1 0之目 的,是為了穩定掃瞄線C Ο Μ與S E G等之掃瞄電壓,因此通 常外接電容之電容值相當大,基本上皆為液晶顯示面板 201中之電容之1000倍以上。 當第2圖中之液晶顯示面板2 0 1之電源關閉時,開關 電晶體2 0 6即開啟並將液晶顯示面板2 0 1與外接電容2 1 0連 接到電阻2 0 8,以將液晶顯示面板2 0 1中之電容與外接電 容2 1 0上之電荷放電去掉,而可以消除上述黑線產生之現 象。但是,因為放電的電流,基本上不能太大而需被限 制,而且因為外接電容之電容值相當大,所以此放電過 程所需時間會很長,使得上述黑線產生之現象無法很快 〇 被消除。因此一種可以縮短放電時間,很快消除黑線之 裝置與方法是必須的。11549twf.ptd Page 8 1259991 V. Description of the invention (2) Voltage, which produces an observable black line. Please refer to FIG. 1A and FIG. 1B, which are schematic diagrams showing a black line generated by residual voltage on a conventional liquid crystal display panel. In order to solve the above problem, a conventional liquid crystal display panel needs to be provided with a discharge circuit, and when the power source is turned off, the charge on the capacitor in the liquid crystal display panel can be quickly discharged, and the black line generation phenomenon can be eliminated. . Referring to Figure 2, there is shown a circuit diagram of a conventional discharge line of a liquid crystal display panel. In an LCD driver 1C 203, a switching transistor 2 0 6 and a resistor 2 0 8 are included. The switching transistor 2 0 6 is connected to all of the capacitors in a liquid crystal display panel 2 0 1 through a driving switch 204. In addition, the switching transistor 206 is further connected to an external capacitor 4 2 1 0. The purpose of connecting the liquid crystal display panel 2 0 1 to the external capacitor 2 1 0 is to stabilize the scanning voltages of the scanning lines C Ο Μ and SEG, etc. Therefore, the capacitance of the external capacitor is usually quite large, basically liquid crystal. The capacitance in the display panel 201 is 1000 times or more. When the power of the liquid crystal display panel 2 0 1 in FIG. 2 is turned off, the switching transistor 206 is turned on and the liquid crystal display panel 2 0 1 and the external capacitor 2 1 0 are connected to the resistor 2 0 8 to display the liquid crystal display. The capacitor in the panel 2 0 1 and the charge on the external capacitor 2 10 0 are discharged, and the phenomenon of the above black line can be eliminated. However, since the current of the discharge is basically not too large and needs to be limited, and since the capacitance of the external capacitor is relatively large, the time required for the discharge process is long, so that the phenomenon of the above black line cannot be quickly smashed. eliminate. Therefore, a device and method that can shorten the discharge time and quickly eliminate the black line are necessary.
11549twf.ptd 第9頁 1259991 五、發明說明(3) 發明内容 針對上述傳統技術之限制,本發明之第一個目的是 提出一種可以縮短放電時間,消除黑線產生之放電線路 與放電方法。 本發明之第二個目的是提出一種液晶顯示面板之放 電線路與方法,可以縮短液晶顯示面板之放電時間,並 消除黑線產生。 因此,為了達成上述目的之某一部分,本發明提出 一種放電線路,包括一第一放電電路,連接到一第一電 容;一第二放電電路,連接到一第二電容;一切換電 路,連接至該第一電容與該第二電容;以及一放電訊 號,用以啟動或關閉該放電線路;其中當該放電訊號啟 動該放電線路時,將該切換電路開路,啟動該第一放電 電路,使得該第一電容經由該第一放電電路放電,以及 啟動該第二放電電路,使得該第二電容經由該第二放電 電路放電;當關閉該放電線路時,將該切換電路閉路, 並關閉該第一放電電路與該第二放電電路,使得該第一 電容與該第二電容短路在一起。 如上所述之放電線路,更佳的是,其中該第一放電 電路包括一第一切換電路與一第一電阻,以及該第二放 電電路包括一第二切換電路與一第二電阻。 本發明提出一種放電方法,包括了,產生一放電訊 號,用於一第一電容與一第二電容;當該放電訊號為一 啟動(a c t i v e )訊號時,將該第一電容與該第二電容放11549 twf.ptd Page 9 1259991 V. SUMMARY OF THE INVENTION (3) SUMMARY OF THE INVENTION In view of the limitations of the above conventional techniques, a first object of the present invention is to provide a discharge line and discharge method which can shorten the discharge time and eliminate the generation of black lines. A second object of the present invention is to provide a discharge line and method for a liquid crystal display panel which can shorten the discharge time of the liquid crystal display panel and eliminate black line generation. Therefore, in order to achieve a certain part of the above object, the present invention provides a discharge line comprising a first discharge circuit connected to a first capacitor, a second discharge circuit connected to a second capacitor, and a switching circuit connected to The first capacitor and the second capacitor; and a discharge signal for starting or turning off the discharge line; wherein when the discharge signal starts the discharge line, the switching circuit is opened, and the first discharge circuit is activated, so that Discharging the first capacitor through the first discharge circuit, and starting the second discharge circuit, so that the second capacitor is discharged via the second discharge circuit; when the discharge line is turned off, the switching circuit is closed, and the first is turned off The discharge circuit and the second discharge circuit short-circuit the first capacitor and the second capacitor. More preferably, the first discharge circuit includes a first switching circuit and a first resistor, and the second discharging circuit includes a second switching circuit and a second resistor. The present invention provides a discharge method including: generating a discharge signal for a first capacitor and a second capacitor; and when the discharge signal is an active signal, the first capacitor and the second capacitor put
11549twf.ptd 第10頁 1259991 五、發明說明(4) 電;以及當該放電訊號為一關閉(i n a c t i v e )訊號時,將 該第一電容與該第二電容短路(short)在一起。 為了達成上述目的之某一部分,本發明提出一種液 晶顯示面板之放電線路,包括一液晶顯示面板,具有一 第一電容;一第一放電電路’連接到該液晶顯不面板中 之該第一電容;一第二放電電路,連接到一第二電容; 一切換裝置,連接至該第一電容與該第二電容;以及一 放電訊號,用以啟動或關閉該放電線路;其中當該放電 訊號啟動該放電線路時,將該切換電路開路,啟動該第 一放電電路,使得該第一電容經由該第一放電電路放 電,以及啟動該第二放電電路,使得該第二電容經由該 $ 第二放電電路放電;當關閉該放電線路時,將該切換電 路閉路,並關閉該第一放電電路與該第二放電電路,使 得該第一電容與該第二電容短路在一起。 如上所述之液晶顯示面板之放電線路,更佳的是, 其中該第一電容至少包括該液晶顯示面板之一寄生電容 或一外接電容其中之一。 如上所述之液晶顯示面板之放電線路,更佳的是, 其中更包括一組電源偵測裝置,用以偵測該液晶顯示面 板之一電源,當該電源發生變化時,產生該放電訊號。 如上所述之液晶顯示面板之放電線路,更佳的是, 其中該第一放電電路包括一第一切換電路與一第一電 0 阻,以及該第二放電電路包括一第二切換電路與一第二 電阻。11549twf.ptd Page 10 1259991 V. INSTRUCTION DESCRIPTION (4) Electricity; and when the discharge signal is an off signal (i n a c t i v e ), the first capacitor is shorted with the second capacitor. In order to achieve a certain part of the above object, the present invention provides a discharge line for a liquid crystal display panel, comprising a liquid crystal display panel having a first capacitor; a first discharge circuit 'connecting to the first capacitor in the liquid crystal display panel a second discharge circuit connected to a second capacitor; a switching device coupled to the first capacitor and the second capacitor; and a discharge signal for activating or deactivating the discharge line; wherein when the discharge signal is activated In the discharging circuit, the switching circuit is opened, the first discharging circuit is activated, the first capacitor is discharged through the first discharging circuit, and the second discharging circuit is activated, so that the second capacitor is discharged via the second discharging The circuit discharges; when the discharge line is closed, the switching circuit is closed, and the first discharge circuit and the second discharge circuit are closed, so that the first capacitor and the second capacitor are short-circuited together. Preferably, the first capacitor includes at least one of a parasitic capacitance or an external capacitor of the liquid crystal display panel. Preferably, the discharge line of the liquid crystal display panel as described above further includes a set of power detecting means for detecting a power supply of the liquid crystal display panel, and generating the discharge signal when the power source changes. More preferably, the first discharge circuit includes a first switching circuit and a first electrical resistance, and the second discharging circuit includes a second switching circuit and a Second resistance.
11549twf.ptd 第11頁 1259991 五、發明說明(5) 為了達成上述目的之某一部分,本發明提出一種液 晶顯示面板之放電方法,包括產生一放電訊號,用於具 有一第一電容之一液晶顯示面板與一第二電容;當該放 電訊號為一啟動訊號時,將該第一電容與該第二電容放 電;以及當該放電訊號為一關閉訊號時,將該第一電容 與該第二電容短路在一起。 綜上所述,本發明所提供之放電線路與方法,以及 液晶顯示面板之放電線路與方法,可以當液晶顯示面板 之一電源忽然關閉時,提供一放電電路,縮短液晶顯示 面板之放電時間,並消除黑線之產生。 為讓本發明之上述和其他目的、特徵、和優點能更 4 明顯易懂,下文特舉一較佳實施例,並配合所附圖式, 作詳細說明如下: 實施方式 以下,第3 A圖為一電路圖,繪示一放電線路,係依 據本發明之一較佳實施例。 請參照第3 A圖,提供一放電線路3 0 2,包括了 一第一 放電電路310,係連接到一第一電容312、一第二放電電 路320,係連接到一第二電容322、以及一切換(switch) 電路330 ,連接至第一電容312與第二電容322。在第3A圖 中,提供一放電訊號,係用以啟動(a c t i v e )或關閉 (inactive)放電線路302。其中切換電路330,包括一主 〇 動(a c t i v e )開關元件,或一被動(p a s s i v e )開關元件。 在本發明之一實施例中,更佳的是,如第3 A圖中所11549twf.ptd Page 11 1259991 V. Description of the Invention (5) In order to achieve a certain part of the above object, the present invention provides a discharge method for a liquid crystal display panel, comprising generating a discharge signal for liquid crystal display having a first capacitance a first capacitor and a second capacitor when the discharge signal is a start signal; and the first capacitor and the second capacitor when the discharge signal is a turn-off signal Shorted together. In summary, the discharge circuit and method provided by the present invention, and the discharge line and method of the liquid crystal display panel can provide a discharge circuit when the power of one of the liquid crystal display panels is suddenly turned off, thereby shortening the discharge time of the liquid crystal display panel. And eliminate the black line. The above and other objects, features, and advantages of the present invention will become more apparent from the aspects of the invention. A circuit diagram showing a discharge line is in accordance with a preferred embodiment of the present invention. Referring to FIG. 3A, a discharge line 310 is provided, including a first discharge circuit 310 connected to a first capacitor 312 and a second discharge circuit 320, connected to a second capacitor 322, and A switch circuit 330 is coupled to the first capacitor 312 and the second capacitor 322. In Figure 3A, a discharge signal is provided for activating (a c t i v e ) or inactive discharge line 302. The switching circuit 330 includes a main a (a c t i v e ) switching element or a passive (p a s s i v e ) switching element. In an embodiment of the invention, more preferably, as in Figure 3A
11549twf.ptd 第12頁 1259991 五、發明說明(6) 述之放電線路3〇2,其中第一放電電路310包括一第一切 換電路314與一第一電阻316 ,以及第二放電電路320包括 一第二切換電路3 2 4與一第二電阻3 2 6。其中第一切換電 路3 1 4 ,包括一主動開關元件,或一被動開關元件。第二 切換電路3 2 4 ,包括一主動開關元件,或一被動開關元 件。更佳的是,切換電路3 3 0、第一切換電路3 14以及第 二切換電路3 2 4,可包括一金氧半導體(Metal Oxide Semiconductor, nM0Sn)、以及雙載子連接電晶體 (Bipolar Junction Transistor, M B J τM )等 。 第3B圖為一電路圖’繪示一放電線路/係依據本發 明之另一實施例。在第3B圖中,與第3A圖不同的是,^ 第一放電電路310中,第一切換電路314是位於第一電阻 316與接地端之間,以及在第二放電電路“ο中,第一切 換電路3 2 4是位於第二電阻3 2 6與接地端之間。第3b ^與 第3 A圖之電路配置有所不同,但是都可以^到本發日^ ^ 結果。 此外,在本發明之一實施例中,第3B圖或第3A圖之 第一電阻316或一第二電阻326可以是,例如電路中的寄 生電阻或是實際配置的電阻。 以下,第4A圖與第4B圖為第3A圖之放電線路之運作 示意圖,係依據本發明之一較佳實施例。第3 B圖之放電 線路之運作情形亦可參考第4A圖與第4B圖之說二。 請參照第4 A圖,當放電訊號為啟動放電線路3 〇 2時, 切換電路3 3 0會切換至開路(open),並開啟第一放電電路11549 twf.ptd page 12 1259991 V. Description of the Invention (6) The discharge circuit 3〇2, wherein the first discharge circuit 310 includes a first switching circuit 314 and a first resistor 316, and the second discharging circuit 320 includes a The second switching circuit 3 2 4 and a second resistor 3 26 . The first switching circuit 3 1 4 includes an active switching element or a passive switching element. The second switching circuit 3 2 4 includes an active switching element or a passive switching element. More preferably, the switching circuit 303, the first switching circuit 314, and the second switching circuit 314 may include a metal oxide semiconductor (nome), and a bipolar junction (Bipolar Junction). Transistor, MBJ τM) and so on. Figure 3B is a circuit diagram showing a discharge line/system in accordance with another embodiment of the present invention. In FIG. 3B, unlike FIG. 3A, in the first discharge circuit 310, the first switching circuit 314 is located between the first resistor 316 and the ground, and in the second discharge circuit "o" A switching circuit 3 2 4 is located between the second resistor 3 26 and the ground. The circuit configuration of the 3b ^ and 3A diagrams is different, but the result can be obtained from the date of the present invention. In one embodiment of the present invention, the first resistor 316 or the second resistor 326 of FIG. 3B or FIG. 3A may be, for example, a parasitic resistance in a circuit or an actually configured resistor. Hereinafter, FIG. 4A and FIG. 4B The figure is a schematic diagram of the operation of the discharge line of Fig. 3A according to a preferred embodiment of the present invention. The operation of the discharge line of Fig. 3B can also be referred to the description of Fig. 4A and Fig. 4B. 4 A, when the discharge signal is the start discharge line 3 〇 2, the switching circuit 3 3 0 will switch to open (open), and open the first discharge circuit
第13頁 1259991 五、發明說明(7) 3 1 0 ,也就是第一放電電路3 1 0中之第一切換電路3 1 4為閉 路,因此與第一電阻316連接,使得第一電容312中之電 荷經由第一放電電路3 1 0放電。以及開啟第二放電電路 320,也就是第二放電電路320中之第二切換電路324為閉 路,因此與第二電阻3 2 6連接,使得第二電容3 2 2中之電 荷經由第二放電電路320放電。 請參照第4 B圖,當放電訊號為關閉放電線路3 0 2時, 切換電路3 3 0會切換至閉路(c 1 〇 s e ),使得該第一電容與 該第二電容短路(short)在一起。並關閉第一放電電路 310與第二放電電路320,也就是將第一放電電路31〇中之 第一切換電路314開路,以及第二放電電路320中之第二 似 切換電路3 2 4開路。 綜上所述,依據本發明之一較佳實施例,本發明提 供一種放電方法,包括了,首先產生一放電訊號,用於 一第一電容312與一第二電容3 2 2。當該放電訊號為一啟 動(active)訊號時,將第一電容312與第二電容322放 電。當該放電訊號為一關閉(inactive)訊號時,將第一 電谷312與弟一電谷322短路(short)在一起。 以下,第5 A圖與第5 B圖一放電線路運用於一液晶顯 示面板之運作示意圖,係依據本發明之一較佳實施例。 請參照第5 A圖,本發明提供一放電線路5 〇 2,適用於 一 LCD驅動1C 5〇3。放電線路5〇2包括了一第一放電電路 φ 510、一第二放電電路520、以及一切換電路53〇。其中, 第一放電電路5 1 0,透過一驅動開關5 〇 4連接到一液晶顯Page 13 1259991 V. Description of the Invention (7) 3 1 0 , that is, the first switching circuit 3 1 4 of the first discharging circuit 3 1 0 is closed, and thus connected to the first resistor 316, so that the first capacitor 312 is The charge is discharged via the first discharge circuit 310. And the second discharge circuit 320 is turned on, that is, the second switching circuit 324 of the second discharge circuit 320 is closed, and thus connected to the second resistor 3 26 so that the charge in the second capacitor 32 2 passes through the second discharge circuit. 320 discharge. Referring to FIG. 4B, when the discharge signal is off the discharge line 3 0 2, the switching circuit 310 will switch to the closed circuit (c 1 〇se ), so that the first capacitor and the second capacitor are shorted (short) together. The first discharge circuit 310 and the second discharge circuit 320 are turned off, that is, the first switching circuit 314 of the first discharge circuit 31 is opened, and the second switching circuit 3 24 of the second discharge circuit 320 is opened. In summary, in accordance with a preferred embodiment of the present invention, the present invention provides a method of discharging comprising first generating a discharge signal for a first capacitor 312 and a second capacitor 3 22. When the discharge signal is an active signal, the first capacitor 312 and the second capacitor 322 are discharged. When the discharge signal is an inactive signal, the first valley 312 is shorted to the second valley 322. In the following, a schematic diagram of the operation of a discharge line applied to a liquid crystal display panel according to Figs. 5A and 5B is a preferred embodiment of the present invention. Referring to Figure 5A, the present invention provides a discharge line 5 〇 2 suitable for an LCD driver 1C 5〇3. The discharge line 5〇2 includes a first discharge circuit φ 510, a second discharge circuit 520, and a switching circuit 53A. The first discharge circuit 5 10 is connected to a liquid crystal display through a driving switch 5 〇 4
11549twf.ptd 第14頁 1259991 五、發明說明(8) 示面板5 0 1中,以及驅動開關5 0 4中之所有電容,在第5 A 圖中,該些電容之一總和以一第一電容512表示之。第二 放電電路520 ,連接到一第二電容522。其中液晶顯示面 板5 0 1外接到此第二電容5 2 2之目的,是為了穩定掃瞄線 COM與SEG等之掃瞄電壓,因此通常第二電容522之電容值 · 相當大,基本上皆為液晶顯示面板5 0 1中之電容之1 〇 〇倍 以上。在第5 A圖中,提供一放電訊號,係用以啟動 (active)或關閉(inactive)放電線路502。其中切換電路 530 ,包括一主動(active)開關元件,或一被動 (p a s s i v e )開關元件。 在本發明之一實施例中,更佳的是,如第5 A圖中所 ‘ 述之放電線路502,其中第一放電電路510包括一第一切 換電路514與一第一電阻516,以及第二放電電路520包括 一第二切換電路524與一第二電阻526。其中第一切換電 路5 1 4 ,包括一主動開關元件,或一被動開關元件。第二 切換電路5 2 4,包括一主動開關元件,或一被動開關元 件。更佳的是,切換電路5 3 0、第一切換電路5 1 4以及第 二切換電路5 2 4,可包括一金氧半導體(Metal Oxide Semiconductor, "M0Sn)、以及雙載子連接電晶體 (Bipolar Junction Transistor,丨,BJT 丨丨)等 ° 第5 C圖為一放電線路運用於一液晶顯示面板之運作 示意圖,係依據本發明之一實施例。在第5 C圖中,與第 5A圖不同的是,在第一放電電路510中,第一切換電路 5 1 4是位於第一電阻5 1 6與接地端之間,以及在第二放電11549twf.ptd Page 14 1259991 V. Description of the invention (8) In the panel 5 0 1 and all the capacitors in the drive switch 5 0 4, in the 5A diagram, the sum of one of the capacitors is a first capacitor 512 means it. The second discharge circuit 520 is connected to a second capacitor 522. The purpose of the liquid crystal display panel 510 being externally connected to the second capacitor 5 2 2 is to stabilize the scan voltage of the scan lines COM and SEG, etc., therefore, the capacitance of the second capacitor 522 is generally quite large, basically It is 1 or more times the capacitance of the liquid crystal display panel 501. In Figure 5A, a discharge signal is provided for active or inactive discharge line 502. The switching circuit 530 includes an active switching element or a passive (p a s s i v e ) switching element. In an embodiment of the present invention, more preferably, the discharge line 502 is as described in FIG. 5A, wherein the first discharge circuit 510 includes a first switching circuit 514 and a first resistor 516, and The second discharge circuit 520 includes a second switching circuit 524 and a second resistor 526. The first switching circuit 5 1 4 includes an active switching element or a passive switching element. The second switching circuit 524 includes an active switching element or a passive switching element. More preferably, the switching circuit 530, the first switching circuit 516 and the second switching circuit 524 may include a metal oxide semiconductor (Metal Oxide Semiconductor, "M0Sn), and a bipolar-connected transistor (Bipolar Junction Transistor, 丨, BJT 丨丨), etc. FIG. 5C is a schematic view showing the operation of a discharge line applied to a liquid crystal display panel according to an embodiment of the present invention. In Fig. 5C, unlike Fig. 5A, in the first discharge circuit 510, the first switching circuit 516 is located between the first resistor 516 and the ground, and at the second discharge.
11549twf.ptd 第15頁 1259991 五、發明說明(9) 電路5 2 0中,第二切換電路5 2 4是位於第二電阻5 2 6與接地 端之間。第5C圖與第5A圖之電路配置有所不同,但是都 可以達到本發明之結果。 此外,在本發明之一實施例中,第5 A圖到第5 C圖中 之第一電阻516或一第二電阻526可以是,例如電路中的 寄生電阻或是實際配置的電阻。 以下,第5A圖與第5B圖為一放電線路之運作示意 圖。第5C圖之放電線路之運作情形亦可參考第5A圖與第 5 B圖之說明。 請參照第5 A圖,當放電訊號為啟動放電線路5 0 2時, 切換電路5 3 0會切換至開路(open),並開啟第一放電電路$ 5 1 0 ,也就是第一放電電路5 1 0中之第一切換電路5 1 4為閉 路,因此與第一電阻516連接,使得第一電容512中之電 荷經由第一放電電路5 1 0放電。以及開啟第二放電電路 520 ,也就是第二放電電路520中之第二切換電路524為閉 路,因此與第二電阻5 2 6連接,使得第二電容5 2 2中之電 荷經由第二放電電路520放電。 請參照第5 B圖,當放電訊號為關閉放電線路5 0 2時, 切換電路5 3 0會切換至閉路(close),使得該第一電容與 該第二電容短路(short)在一起。並關閉第一放電電路 510與第二放電電路520,也就是將第一放電電路510中之 第一切換電路5 1 4開路,以及第二放電電路5 2 0中之第二 〇 切換電路3 2 4開路。此時液晶顯示面板5 0 1 ,透過驅動開 關5 0 4與切換開關5 3 0,連接到第二電容5 2 2,使得掃瞄線11549twf.ptd Page 15 1259991 V. INSTRUCTION DESCRIPTION (9) In circuit 5 2 0, the second switching circuit 5 24 is located between the second resistor 5 26 and the ground. The circuit configuration of Fig. 5C and Fig. 5A is different, but the results of the present invention can be achieved. Furthermore, in one embodiment of the invention, the first resistor 516 or the second resistor 526 in Figures 5A through 5C may be, for example, a parasitic resistance in the circuit or an actually configured resistor. Hereinafter, Fig. 5A and Fig. 5B are schematic diagrams showing the operation of a discharge line. The operation of the discharge line of Fig. 5C can also be referred to the description of Figs. 5A and 5B. Referring to FIG. 5A, when the discharge signal is the start discharge line 5 0 2, the switching circuit 530 will switch to open, and turn on the first discharge circuit $5 1 0 , that is, the first discharge circuit 5 The first switching circuit 5 1 4 of 10 is a closed circuit, and thus is connected to the first resistor 516 such that the charge in the first capacitor 512 is discharged via the first discharging circuit 5 10 . And the second discharge circuit 520 is turned on, that is, the second switching circuit 524 of the second discharge circuit 520 is closed, and thus connected to the second resistor 5 26 such that the charge in the second capacitor 52 is via the second discharge circuit. 520 discharge. Referring to FIG. 5B, when the discharge signal is to turn off the discharge line 5 0 2, the switching circuit 530 will switch to close, so that the first capacitor and the second capacitor are shorted together. And closing the first discharge circuit 510 and the second discharge circuit 520, that is, opening the first switching circuit 51 in the first discharge circuit 510, and the second switching circuit 3 in the second discharging circuit 5 2 0 4 open the way. At this time, the liquid crystal display panel 5 0 1 is connected to the second capacitor 5 2 2 through the driving switch 5 0 4 and the switch 5 3 0 to make the scan line
11549twf.ptd 第16頁 1259991 五、發明說明(ίο) COM與SEG等之掃瞄電壓可以藉由第二電容522而穩定。此 第5 B圖即表示液晶顯示面板5 0 1正常運作下之情形。 在本發明之一實施例中,更佳的是,上述之液晶顯 示面板5 0 1之放電線路5 0 2,其中更包括一組電源偵測裝 置5 4 0 ,用以偵測液晶顯示面板5 0 1之一電源,當該電源 發生變化或被中斷時,產生該放電訊號’產生如弟5 A圖 所示之一運作。 更佳的是,上述液晶顯示面板5 0 1之放電線路5 0 2, 其中第一電容512還至少包括液晶顯示面板501之一寄生 電容或一外接電容其中之一。 綜上所述,依據本發明之一較佳實施例,本發明提 供一種液晶顯示面板之放電方法,包括了 ,首先,產生 一放電訊號,用於具有一第一電容之一液晶顯示面板與 一第二電容。當該放電訊號為一啟動訊號時,將該第一 電容與該第二電容放電。以及當該放電訊號為一關閉訊 號時,將該第一電容與該第二電容短路在一起。 綜上所述,本發明所提供之放電線路與方法,以及 液晶顯示面板之放電線路與方法,可用以當液晶顯示面 板5 0 1之一電源忽然關閉時,提供一放電電路5 0 2,使得 液晶顯示面板5 0 1中之掃瞎線上,或其他部分之電容,即 第一電容5 1 2可以很快被放電,而不會產生黑線。雖然上 述之第二電容522,亦即一外接電容,之電容值較大而無 法較快放電,但是因為在液晶顯示面板5 0 1之電源關閉 後,外接電容之放電電路5 2 0已和液晶顯示面板5 0 1分11549twf.ptd Page 16 1259991 V. Description of the Invention (ίο) The scan voltage of COM and SEG can be stabilized by the second capacitor 522. This Fig. 5B shows the case where the liquid crystal display panel 501 is operating normally. In an embodiment of the present invention, it is more preferable that the discharge line 502 of the liquid crystal display panel 501 includes a set of power detecting devices 504 for detecting the liquid crystal display panel 5. 0 1 A power supply, when the power supply changes or is interrupted, the discharge signal is generated to generate one of the operations shown in Figure 5A. More preferably, the discharge line 502 of the liquid crystal display panel 501, wherein the first capacitor 512 further comprises at least one of a parasitic capacitance or an external capacitor of the liquid crystal display panel 501. In summary, according to a preferred embodiment of the present invention, the present invention provides a method for discharging a liquid crystal display panel, comprising: first, generating a discharge signal for a liquid crystal display panel having a first capacitance and a The second capacitor. When the discharge signal is an enable signal, the first capacitor and the second capacitor are discharged. And when the discharge signal is a shutdown signal, shorting the first capacitor and the second capacitor together. In summary, the discharge circuit and method provided by the present invention, and the discharge circuit and method of the liquid crystal display panel can be used to provide a discharge circuit 502 when a power supply of the liquid crystal display panel 501 is suddenly turned off. The capacitance on the broom line or other portion of the liquid crystal display panel 501, that is, the first capacitor 51 can be quickly discharged without generating black lines. Although the second capacitor 522, that is, an external capacitor, has a large capacitance value and cannot be discharged quickly, since the power supply of the liquid crystal display panel 510 is turned off, the external capacitor discharge circuit 5 2 0 and the liquid crystal Display panel 5 0 1
11549twf.ptd 第17頁 1259991 五、發明說明(11) 開,因此不會影響液晶顯示面板5 0 1使其產生黑線。 綜上所述,本發明所提供之放電線路與方法,以及 液晶顯示面板之放電線路與方法,可以當液晶顯示面板 之一電源忽然關閉時,提供一放電電路,縮短液晶顯示 面板之放電時間,並消除黑線之產生。 雖然本發明已以一較佳實施例揭露如上,然其並非 用以限定本發明,任何熟習此技藝者,在不脫離本發明 之精神和範圍内,當可作些許之更動與潤飾,因此本發 明之保護範圍當視後附之申請專利範圍所界定者為準。11549twf.ptd Page 17 1259991 V. Description of the invention (11) On, so it does not affect the liquid crystal display panel 5 0 1 to make black lines. In summary, the discharge circuit and method provided by the present invention, and the discharge line and method of the liquid crystal display panel can provide a discharge circuit when the power of one of the liquid crystal display panels is suddenly turned off, thereby shortening the discharge time of the liquid crystal display panel. And eliminate the black line. Although the present invention has been described above in terms of a preferred embodiment, it is not intended to limit the invention, and it is obvious to those skilled in the art that the present invention may be modified and retouched without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.
11549twf.ptd 第18頁 1259991 圖式簡單說明 第1 A圖與第1 B圖,繪示一習知之液晶顯示面板上, 殘留電壓產生黑線之一示意圖; 第2圖為一電路圖,繪示一習知之液晶顯示面板之放 電線路; 第3 A圖為一電路圖,繪示一放電線路,係依據本發 明之一較佳實施例; 第3 B圖為一電路圖,繪示一放電線路,係依據本發 明之另一實施例; 第4A圖與第4B圖為一放電線路之運作示意圖,係依 據本發明之一較佳實施例; 第5A圖與第5B圖為一放電線路運用於一液晶顯示面 $ 板之運作示意圖,係依據本發明之一較佳實施例;以及 第5 C圖為一放電線路運用於一液晶顯示面板之運作 示意圖,係依據本發明之一實施例。 圖式標記說明: 2 0 1 、5 0 1 :液晶顯示面板 203 、 503 : LCD 驅動1C 2 0 4、5 0 4 ·•驅動開關 2 0 6 :開關電晶體 208 、316 、326 、516 、526 :電阻 210 、 312 、 322 、 512 、 522 :電容 3 0 2、5 0 2 :放電線路 ίΙ 310 、 320 、 510 、 520 :放電電路 314 、324 、330 、514 、524 、530 :切換電路11549twf.ptd Page 18 1259991 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A and FIG. 1B are diagrams showing a schematic diagram of a black line generated by a residual voltage on a conventional liquid crystal display panel; FIG. 2 is a circuit diagram showing a A discharge circuit of a conventional liquid crystal display panel; FIG. 3A is a circuit diagram showing a discharge line according to a preferred embodiment of the present invention; and FIG. 3B is a circuit diagram showing a discharge line according to a circuit diagram Another embodiment of the present invention; FIGS. 4A and 4B are schematic diagrams showing the operation of a discharge line according to a preferred embodiment of the present invention; FIGS. 5A and 5B are diagrams showing a discharge line applied to a liquid crystal display. A schematic diagram of the operation of the panel is based on a preferred embodiment of the present invention; and FIG. 5C is a schematic diagram of the operation of a discharge line for a liquid crystal display panel, in accordance with an embodiment of the present invention. Schematic description: 2 0 1 , 5 0 1 : LCD panel 203, 503 : LCD driver 1C 2 0 4, 5 0 4 ·• Drive switch 2 0 6 : Switching transistor 208, 316, 326, 516, 526 : Resistors 210, 312, 322, 512, 522: Capacitors 3 0 2, 5 0 2 : Discharge lines Ι 310, 320, 510, 520: Discharge circuits 314, 324, 330, 514, 524, 530: switching circuits
11549twf.ptd 第19頁 1259991 圖式簡單說明 COM 、 SEG :掃瞄線 1 11549twf.ptd 第20頁11549twf.ptd Page 19 1259991 Schematic description of the COM, SEG: Scanning line 1 11549twf.ptd Page 20
Claims (1)
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TW93111203A TWI259991B (en) | 2004-04-22 | 2004-04-22 | Discharge device and discharge method and liquid crystal display using thereof |
JP2005107577A JP4283779B2 (en) | 2004-04-22 | 2005-04-04 | Discharge circuit and discharge method for liquid crystal display |
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TW93111203A TWI259991B (en) | 2004-04-22 | 2004-04-22 | Discharge device and discharge method and liquid crystal display using thereof |
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TWI259991B true TWI259991B (en) | 2006-08-11 |
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JP4984391B2 (en) * | 2005-01-07 | 2012-07-25 | カシオ計算機株式会社 | Display drive device, display device, and drive control method thereof |
KR100752340B1 (en) | 2005-12-21 | 2007-08-27 | 엘지전자 주식회사 | Light-emitting device and method of driving the same |
JP5006655B2 (en) * | 2007-01-15 | 2012-08-22 | ルネサスエレクトロニクス株式会社 | Power supply circuit for display device and display device |
JP4502003B2 (en) * | 2007-12-26 | 2010-07-14 | エプソンイメージングデバイス株式会社 | Electro-optical device and electronic apparatus including the electro-optical device |
TWI496133B (en) * | 2013-10-11 | 2015-08-11 | Au Optronics Corp | Display apparatus and flicker prevention method |
US11657774B2 (en) | 2015-09-16 | 2023-05-23 | E Ink Corporation | Apparatus and methods for driving displays |
WO2017049020A1 (en) * | 2015-09-16 | 2017-03-23 | E Ink Corporation | Apparatus and methods for driving displays |
US10803813B2 (en) | 2015-09-16 | 2020-10-13 | E Ink Corporation | Apparatus and methods for driving displays |
US10964282B2 (en) * | 2018-06-12 | 2021-03-30 | Sharp Kabushiki Kaisha | Power supply circuit and display device |
US20210159692A1 (en) * | 2019-11-27 | 2021-05-27 | Corning Research & Development Corporation | Line capacitance discharge in a power distribution system employing safety power disconnection |
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2004
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JP4283779B2 (en) | 2009-06-24 |
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