TW201423705A - Source driver - Google Patents
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Abstract
Description
本發明是有關於一種源極驅動器，且特別是有關於一種液晶顯示器的源極驅動器。 This invention relates to a source driver and, more particularly, to a source driver for a liquid crystal display.
近年來，由於液晶顯示器(Liquid Crystal Display)具有高畫質、空間利用效率佳、低消耗功率、無輻射等特性，因此液晶顯示器已成為目前顯示器市場的主流，並廣泛地應用在攝錄放影機、筆記型電腦、桌上型顯示器及各種電子產品中。 In recent years, liquid crystal displays have become the mainstream of the current display market due to their high image quality, good space utilization efficiency, low power consumption, and no radiation. They are widely used in video recording. Machines, notebook computers, desktop displays and various electronic products.
一般而言，液晶顯示器包括顯示面板與源極驅動器。其中，源極驅動器會透過其驅動通道傳送灰階電壓至顯示面板，以對顯示面板中的畫素進行充電。然而，在細部操作上，當液晶顯示器的電源關掉後，顯示面板中的畫素仍然存有相當的殘存電荷。此外，這些殘存電荷並無有效的放電路徑，進而致使畫素必須經過一段時間後才能完全地放電完畢。因此，在液晶顯示器關機時，顯示面板往往會有殘影(afterimage)的現象產生，進而降低液晶顯示器的顯示品質。 In general, a liquid crystal display includes a display panel and a source driver. The source driver transmits a gray scale voltage to the display panel through its driving channel to charge the pixels in the display panel. However, in the detailed operation, when the power of the liquid crystal display is turned off, the pixels in the display panel still have a considerable residual charge. In addition, these residual charges do not have an effective discharge path, which in turn causes the pixels to be completely discharged after a period of time. Therefore, when the liquid crystal display is turned off, the display panel often has an afterimage phenomenon, thereby reducing the display quality of the liquid crystal display.
因此，如何改善液晶顯示器在關機時的殘影現象，已是液晶顯示器在設計上的一重要課題。 Therefore, how to improve the image sticking phenomenon of the liquid crystal display during shutdown is an important issue in the design of the liquid crystal display.
本發明提供一種源極驅動器，將驅動通道劃分成多個通道群組，並分別利用第一重置電路與第二重置電路將每一通道群組重置至接地端。藉此，將可改善液晶顯示器在關機時的殘影現象，並增加源極驅動器之靜電放電的防護能力。 The present invention provides a source driver that divides a drive channel into a plurality of channel groups and resets each channel group to a ground terminal by using a first reset circuit and a second reset circuit, respectively. Thereby, the image sticking phenomenon of the liquid crystal display during shutdown can be improved, and the protection capability of the electrostatic discharge of the source driver can be increased.
本發明提出一種源極驅動器，包括M個通道群組、M個第一重置電路以及M個第二重置電路。每一通道群組包括N個驅動通道，M與N為大於1之整數。所述M個第一重置電路電性連接所述M個通道群組與M個重置走線。所述M個第二重置電路電性連接所述M個重置走線。其中，第i個第一重置電路依據第一控制訊號而將第i個通道群組中的所述N個驅動通道導通至第i個重置走線，且第i個第二重置電路依據一第二控制訊號而將第i個重置走線導通至接地端，i為整數且1≦i≦M。 The invention provides a source driver comprising M channel groups, M first reset circuits and M second reset circuits. Each channel group includes N drive channels, and M and N are integers greater than one. The M first reset circuits are electrically connected to the M channel groups and M reset traces. The M second reset circuits are electrically connected to the M reset traces. The i-th first reset circuit turns on the N driving channels in the i-th channel group to the i-th reset trace according to the first control signal, and the ith second reset circuit The ith reset trace is turned on to the ground according to a second control signal, where i is an integer and 1 ≦ i ≦ M.
在本發明之一實施例中，上述之第i個第一重置電路包括N個第一開關。第j個第一開關的第一端電性連接至第i個通道群組中的第j個驅動通道，j為整數且1≦j≦N。所述N個第一開關的第二端電性連接第i個重置走線。此外，所述N個第一開關依據該第一控制訊號而導通其第一端與第二端。 In an embodiment of the invention, the ith first reset circuit includes N first switches. The first end of the jth first switch is electrically connected to the jth driving channel in the i-th channel group, and j is an integer and 1≦j≦N. The second ends of the N first switches are electrically connected to the ith reset trace. In addition, the N first switches turn on the first end and the second end according to the first control signal.
在本發明之一實施例中，上述之第i個第二重置電路包括一第二開關。第二開關的第一端電性連接第i個重置走線，且第二開關的第二端電性連接至接地端。此外，第二開關依據第二控制訊號而導通其第一端與第二端。 In an embodiment of the invention, the ith second reset circuit includes a second switch. The first end of the second switch is electrically connected to the ith reset trace, and the second end of the second switch is electrically connected to the ground. In addition, the second switch turns on the first end and the second end according to the second control signal.
在本發明之一實施例中，上述之源極驅動器操作在一電源電壓下。此外，當電源電壓下降至預設準位時，上述之源極驅動器產生第一控制訊號與第二控制訊號。 In one embodiment of the invention, the source driver is operated at a supply voltage. In addition, when the power supply voltage drops to a preset level, the source driver generates the first control signal and the second control signal.
基於上述，本發明是將每一源極驅動器的驅動通道劃分成多個通道群組，並分別利用第一重置電路與第二重置電路將每一通道群組重置至接地端。藉此，每一源極驅動器的驅動通道將可以快速地下拉至接地端，進而改善液晶顯示器在關機時的殘影現象。此外，由於每一源極驅動器中的每一通道群組都是進行多段式的重置，因此還可以增加每一源極驅動器之靜電放電的防護能力。 Based on the above, the present invention divides the driving channel of each source driver into a plurality of channel groups, and resets each channel group to the ground terminal by using the first reset circuit and the second reset circuit, respectively. Thereby, the driving channel of each source driver can be quickly pulled down to the grounding end, thereby improving the image sticking phenomenon of the liquid crystal display during shutdown. In addition, since each channel group in each source driver is multi-stage reset, it is also possible to increase the electrostatic discharge protection capability of each source driver.
為讓本發明之上述特徵和優點能更明顯易懂，下文特舉實施例，並配合所附圖式作詳細說明如下。 The above described features and advantages of the present invention will be more apparent from the following description.
圖1為依據本發明之一示範性實施例之液晶顯示器的方塊示意圖。參照圖1，液晶顯示器100包括顯示面板110與多個源極驅動器121~123。其中，源極驅動器121~123用以驅動顯示面板110，以致使顯示面板110可以顯示出相應的影像。在細部操作上，每一源極驅動器121~123包括多個驅動通道。此外，每一源極驅動器121~123是透過驅動通道來傳送灰階電壓至顯示面板110，以致使顯示面板110因應灰階電壓顯示出相應的影像。 1 is a block diagram of a liquid crystal display according to an exemplary embodiment of the present invention. Referring to FIG. 1, the liquid crystal display 100 includes a display panel 110 and a plurality of source drivers 121-123. The source drivers 121-123 are used to drive the display panel 110 so that the display panel 110 can display corresponding images. In detail operation, each of the source drivers 121-123 includes a plurality of drive channels. In addition, each of the source drivers 121-123 transmits a gray scale voltage to the display panel 110 through the driving channel, so that the display panel 110 displays the corresponding image according to the gray scale voltage.
值得一提的是，每一源極驅動器121~123將其驅動通道劃分成多個通道群組，並在液晶顯示器100關機時，針 對每一通道群組進行多段式的重置。藉此，當液晶顯示器100關機時，每一源極驅動器121~123的驅動通道將可以快速地下拉至接地端，進而致使顯示面板110中的畫素可以快速地放電。如此一來，將可以改善液晶顯示器100在關機時的殘影現象，進而提升液晶顯示器100的顯示品質。此外，由於每一源極驅動器121~123中的每一通道群組都是進行多段式的重置，因此還可以增加每一源極驅動器121~123之靜電放電(Electrostatic Discharge，ESD)的防護能力。 It is worth mentioning that each source driver 121~123 divides its driving channel into a plurality of channel groups, and when the liquid crystal display 100 is turned off, the needle Multi-stage reset for each channel group. Thereby, when the liquid crystal display 100 is turned off, the driving channels of each of the source drivers 121-123 can be quickly pulled down to the ground, thereby causing the pixels in the display panel 110 to be quickly discharged. As a result, the image sticking phenomenon of the liquid crystal display 100 at the time of shutdown can be improved, thereby improving the display quality of the liquid crystal display 100. In addition, since each of the source drivers 121-123 is multi-stage reset, the electrostatic discharge (ESD) protection of each of the source drivers 121-123 can be increased. ability.
為了致使本領域具有通常知識者能夠更了解本實施例，以下將列舉源極驅動器121的細部操作。圖2為依據本發明之一示範性實施例之源極驅動器的電路示意圖。參照圖2，源極驅動器121包括M個通道群組210_1~210_M、M個第一重置電路220_1~220_M以及M個第二重置電路230_1~230_M。其中，M為大於1之整數，例如：M可相等於3，但本發明不以此為限。 In order to enable those skilled in the art to better understand the present embodiment, the detailed operation of the source driver 121 will be enumerated below. 2 is a circuit diagram of a source driver in accordance with an exemplary embodiment of the present invention. Referring to FIG. 2, the source driver 121 includes M channel groups 210_1 210 210_M, M first reset circuits 220_1 220 220_M, and M second reset circuits 230_1 230 230_M. Wherein, M is an integer greater than 1, for example, M may be equal to 3, but the invention is not limited thereto.
更進一步來看，每一通道群組210_1~210_M包括N個驅動通道，其中N為大於1之整數。例如，通道群組210_1包括N個驅動通道CH1_1~CH1_N，通道群組210_2包括N個驅動通道CH2_1~CH2_N，且通道群組210_M包括N個驅動通道CHM_1~CHM_N。值得一提的是，倘若源極驅動器121包括720個驅動通道，則在M=3的情況下，每一通道群組將包括240個驅動通道，亦即N=240。 Looking further, each channel group 210_1~210_M includes N drive channels, where N is an integer greater than one. For example, the channel group 210_1 includes N driving channels CH1_1~CH1_N, the channel group 210_2 includes N driving channels CH2_1~CH2_N, and the channel group 210_M includes N driving channels CHM_1~CHM_N. It is worth mentioning that if the source driver 121 includes 720 drive channels, in the case of M=3, each channel group will include 240 drive channels, that is, N=240.
此外，第一重置電路220_1~220_M各自包括N個第 一開關。舉例來說，第一重置電路220_1包括N個第一開關SW1_1~SW1_N，並電性連接通道群組210_1與重置走線240_1。其中，如圖2所示，第一開關SW1_1~SW1_N可分別由一N型電晶體所組成，但其並非用以限定本發明。例如，在另一示範性實施例中，第一開關SW1_1~SW1_N也可分別由一P型電晶體所組成。 In addition, the first reset circuits 220_1~220_M each include N first A switch. For example, the first reset circuit 220_1 includes N first switches SW1_1~SW1_N, and is electrically connected to the channel group 210_1 and the reset trace 240_1. As shown in FIG. 2, the first switches SW1_1~SW1_N may each be composed of an N-type transistor, but it is not intended to limit the present invention. For example, in another exemplary embodiment, the first switches SW1_1~SW1_N may also be respectively composed of a P-type transistor.
更進一步來看，N個第一開關SW1_1~SW1_N與通道群組210_1中的N個驅動通道CH1_1~CH1_N一對一對應。此外，第一開關SW1_1的第一端電性連接驅動通道CH1_1，且第一開關SW1_1的第二端電性連接重置走線240_1。相似地，第一開關SW1_2的第一端電性連接驅動通道CH1_2，且第一開關SW1_2的第二端電性連接重置走線240_1。以此類推，第一重置電路220_1中其餘之第一開關的連接型態。 Further, the N first switches SW1_1~SW1_N are in one-to-one correspondence with the N drive channels CH1_1~CH1_N in the channel group 210_1. In addition, the first end of the first switch SW1_1 is electrically connected to the driving channel CH1_1, and the second end of the first switch SW1_1 is electrically connected to the reset trace 240_1. Similarly, the first end of the first switch SW1_2 is electrically connected to the driving channel CH1_2, and the second end of the first switch SW1_2 is electrically connected to the resetting trace 240_1. And so on, the connection type of the remaining first switches in the first reset circuit 220_1.
換言之，第一重置電路220_1中的第j個第一開關SW1_1的第一端電性連接至通道群組210_1中的第j個驅動通道，且第一開關SW1_1~SW1_N的第二端皆電性連接重置走線240_1，其中j為整數且1≦j≦N。在操作上，第一開關SW1_1~SW1_N皆會依據第一控制訊號CT1而導通其第一端與第二端。換言之，當第一開關SW1_1~SW1_N接收到第一控制訊號CT1時，通道群組210_1中的N個驅動通道CH1_1~CH1_N皆將導通至重置走線240_1。 In other words, the first end of the jth first switch SW1_1 of the first reset circuit 220_1 is electrically connected to the jth drive channel of the channel group 210_1, and the second ends of the first switches SW1_1~SW1_N are all electrically The sexual connection resets the trace 240_1, where j is an integer and 1≦j≦N. In operation, the first switches SW1_1~SW1_N turn on the first end and the second end according to the first control signal CT1. In other words, when the first switch SW1_1~SW1_N receives the first control signal CT1, the N driving channels CH1_1~CH1_N in the channel group 210_1 will be turned on to the reset line 240_1.
相似地，第一重置電路220_2包括N個第一開關SW2_1~SW2_N，並電性連接通道群組210_2與重置走線 240_2。在細部架構上，N個第一開關SW2_1~SW2_N的第一端與通道群組210_2中的N個驅動通道CH2_1~CH2_N一對一電性連接，且第一開關SW2_1~SW2_N的第二端皆電性連接至重置走線240_2。此外，在操作上，第一開關SW2_1~SW2_N皆會依據第一控制訊號CT1而導通其第一端與第二端，進而致使通道群組210_2中的N個驅動通道CH2_1~CH2_N皆將導通至重置走線240_2。以此類推，第一重置電路220_M中N個第一開關SWM_1~SWM_N的連接關係與運作方式。 Similarly, the first reset circuit 220_2 includes N first switches SW2_1~SW2_N, and electrically connects the channel group 210_2 with the reset trace. 240_2. On the detailed structure, the first ends of the N first switches SW2_1~SW2_N are electrically connected to the N driving channels CH2_1~CH2_N in the channel group 210_2, and the second ends of the first switches SW2_1~SW2_N are Electrically connected to the reset trace 240_2. In addition, in operation, the first switches SW2_1~SW2_N turn on the first end and the second end according to the first control signal CT1, so that the N driving channels CH2_1~CH2_N in the channel group 210_2 are turned on to Reset trace 240_2. Similarly, the connection relationship and operation mode of the N first switches SWM_1 SWSWM_N in the first reset circuit 220_M.
請繼續參照圖2，第二重置電路230_1~230_M各自包括一第二開關。舉例來說，第二重置電路230_1包括第二開關，且第二開關SW31是由一N型電晶體所組成。雖然本實施例列舉了第二開關的實施型態，但其並非用以限定本發明。例如，在另一示範性實施例中，第二開關SW31也可由一P型電晶體所組成。此外，第二開關SW31的第一端電性連接重置走線240_1，第二開關SW31的第二端電性連接至接地端。在操作上，第二開關SW31會依據第二控制訊號CT2而導通其第一端與第二端，進而致使重置走線240_1導通至接地端。相似地，第二重置電路230_2包括第二開關SW32，且第二開關SW32電性連接在重置走線240_2與接地端之間。此外，第二開關SW32會依據第二控制訊號CT2而導通其第一端與第二端，進而致使重置走線240_2導通至接地端。以此類推，第二重置電路230_M中第二開關SW3M的連接關係與運作方式。 Referring to FIG. 2, the second reset circuits 230_1~230_M each include a second switch. For example, the second reset circuit 230_1 includes a second switch, and the second switch SW31 is composed of an N-type transistor. Although this embodiment exemplifies the implementation of the second switch, it is not intended to limit the invention. For example, in another exemplary embodiment, the second switch SW31 may also be composed of a P-type transistor. In addition, the first end of the second switch SW31 is electrically connected to the reset trace 240_1, and the second end of the second switch SW31 is electrically connected to the ground. In operation, the second switch SW31 turns on the first end and the second end according to the second control signal CT2, thereby causing the reset trace 240_1 to conduct to the ground. Similarly, the second reset circuit 230_2 includes a second switch SW32, and the second switch SW32 is electrically connected between the reset trace 240_2 and the ground. In addition, the second switch SW32 turns on the first end and the second end according to the second control signal CT2, thereby causing the reset trace 240_2 to be turned on to the ground. And so on, the connection relationship and operation mode of the second switch SW3M in the second reset circuit 230_M.
整體而言，由於源極驅動器121包括M個通道群組210_1~210_M，且每一通道群組包括N個驅動通道，因此源極驅動器121共包括M×N個驅動通道。相對地，在一示範性實施例中，源極驅動器121更包括M×N個輸出緩衝器，例如：BF1_1~BF1_N、BF2_1~BF2_N、BFM_1~BFM_N，且M×N個輸出緩衝器與M×N個驅動通道一對一的電性連接。此外，所述M×N個輸出緩衝器用以產生M×N個灰階電壓，並透過所述M×N個驅動通道傳送M×N個灰階電壓至顯示面板110。 In general, since the source driver 121 includes M channel groups 210_1 210 210_M, and each channel group includes N driving channels, the source driver 121 includes a total of M×N driving channels. In contrast, in an exemplary embodiment, the source driver 121 further includes M×N output buffers, for example, BF1_1~BF1_N, BF2_1~BF2_N, BFM_1~BFM_N, and M×N output buffers and M×. One-to-one electrical connection of N drive channels. In addition, the M×N output buffers are used to generate M×N gray scale voltages, and transmit M×N gray scale voltages to the display panel 110 through the M×N drive channels.
在整體運作上，源極驅動器121操作在一電源電壓下。此外，當液晶顯示器100關機時，所述電源電壓的準位會逐漸地下降。其中，當所述電源電壓下降至一預設準位時，源極驅動器121將產生第一控制訊號CT1與第二控制訊號CT2。藉此，通道群組210_1~210_M將可透過第一重置電路220_1~220_M導通至重置走線240_1~240_M，且重置走線240_1~240_M將可透過第二重置電路230_1~230_M導通至接地端。 In overall operation, the source driver 121 operates at a supply voltage. In addition, when the liquid crystal display 100 is turned off, the level of the power supply voltage is gradually lowered. The source driver 121 generates the first control signal CT1 and the second control signal CT2 when the power supply voltage drops to a predetermined level. Therefore, the channel groups 210_1~210_M can be turned on to the reset lines 240_1~240_M through the first reset circuits 220_1~220_M, and the reset lines 240_1~240_M can be turned on through the second reset circuits 230_1~230_M. To the ground.
換言之，當液晶顯示器100關機時，源極驅動器121中的M×N個驅動通道會階段式地重置至接地端。此外，由於源極驅動器121中的M×N個驅動通道被劃分成M個通道群組210_1~210_M，因此對每一個第二重置電路而言，其所對應之第一重置電路中的開關個數以及連接走線(例如：重置走線)的長度都將可以被降低。相對地，每一個第二重置電路因應寄生電容與寄生電阻所產生的延遲效 應將可被降低，進而致使M×N個驅動通道可以透過第一重置電路220_1~220_M與第二重置電路230_1~230_M快速地導通至接地端。 In other words, when the liquid crystal display 100 is turned off, the M×N drive channels in the source driver 121 are periodically reset to the ground. In addition, since the M×N drive channels in the source driver 121 are divided into M channel groups 210_1 210 210_M, for each second reset circuit, the corresponding first reset circuit The number of switches and the length of the connection traces (eg reset traces) can be reduced. In contrast, each second reset circuit has a delay effect due to parasitic capacitance and parasitic resistance. It should be reduced, so that M×N drive channels can be quickly turned on to the ground through the first reset circuits 220_1~220_M and the second reset circuits 230_1~230_M.
綜上所述，本發明是將每一源極驅動器的驅動通道劃分成多個通道群組，並針對每一通道群組進行多段式的重置。藉此，當液晶顯示器關機時，每一源極驅動器的驅動通道將可以快速地下拉至接地端，進而改善液晶顯示器在關機時的殘影現象。此外，由於每一源極驅動器中的每一通道群組都是進行多段式的重置，因此還可以增加每一源極驅動器之靜電放電的防護能力。 In summary, the present invention divides the drive channel of each source driver into a plurality of channel groups, and performs multi-stage reset for each channel group. Thereby, when the liquid crystal display is turned off, the driving channel of each source driver can be quickly pulled down to the grounding end, thereby improving the image sticking phenomenon of the liquid crystal display during shutdown. In addition, since each channel group in each source driver is multi-stage reset, it is also possible to increase the electrostatic discharge protection capability of each source driver.
雖然本發明已以實施例揭露如上，然其並非用以限定本發明，任何所屬技術領域中具有通常知識者，在不脫離本發明之精神和範圍內，當可作些許之更動與潤飾，故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。 Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.
100‧‧‧液晶顯示器 100‧‧‧LCD display
110‧‧‧顯示面板 110‧‧‧ display panel
121~123‧‧‧源極驅動器 121~123‧‧‧Source Driver
210_1~210_M‧‧‧通道群組 210_1~210_M‧‧‧Channel group
CH1_1~CH1_N、CH2_1~CH2_N、CHM_1~CHM_N‧‧‧驅動通道 CH1_1~CH1_N, CH2_1~CH2_N, CHM_1~CHM_N‧‧‧ drive channels
220_1~220_M‧‧‧第一重置電路 220_1~220_M‧‧‧First reset circuit
SW1_1~SW1_N、SW2_1~SW2_N、WM_1~SWM_N‧‧‧第一開關 SW1_1~SW1_N, SW2_1~SW2_N, WM_1~SWM_N‧‧‧ first switch
230_1~230_M‧‧‧第二重置電路 230_1~230_M‧‧‧Second reset circuit
SW31~SW3M‧‧‧第二開關 SW31~SW3M‧‧‧Second switch
240_1~240_M‧‧‧重置走線 240_1~240_M‧‧‧Reset the trace
BF1_1~BF1_N、BF2_1~BF2_N、BFM_1~BFM_N‧‧‧輸出緩衝器 BF1_1~BF1_N, BF2_1~BF2_N, BFM_1~BFM_N‧‧‧ output buffer
CT1‧‧‧第一控制訊號 CT1‧‧‧ first control signal
CT2‧‧‧第二控制訊號 CT2‧‧‧second control signal
圖1為依據本發明之一示範性實施例之液晶顯示器的方塊示意圖。 1 is a block diagram of a liquid crystal display according to an exemplary embodiment of the present invention.
圖2為依據本發明之一示範性實施例之源極驅動器的電路示意圖。 2 is a circuit diagram of a source driver in accordance with an exemplary embodiment of the present invention.
121‧‧‧源極驅動器 121‧‧‧Source Driver
210_1~210_M‧‧‧通道群組 210_1~210_M‧‧‧Channel group
220_1~220_M‧‧‧第一重置電路 220_1~220_M‧‧‧First reset circuit
230_1~230_M‧‧‧第二重置電路 230_1~230_M‧‧‧Second reset circuit
240_1~240_M‧‧‧重置走線 240_1~240_M‧‧‧Reset the trace
CH1_1~CH1_N、CH2_1~CH2_N、CHM_1~CHM_N‧‧‧驅動通道 CH1_1~CH1_N, CH2_1~CH2_N, CHM_1~CHM_N‧‧‧ drive channels
SW1_1~SW1_N、SW2_1~SW2_N、WM_1~SWM_N‧‧‧第一開關 SW1_1~SW1_N, SW2_1~SW2_N, WM_1~SWM_N‧‧‧ first switch
SW31~SW3M‧‧‧第二開關 SW31~SW3M‧‧‧Second switch
BF1_1~BF1_N、BF2_1~BF2_N、BFM_1~BFM_N‧‧‧輸出緩衝器 BF1_1~BF1_N, BF2_1~BF2_N, BFM_1~BFM_N‧‧‧ output buffer
CT1‧‧‧第一控制訊號 CT1‧‧‧ first control signal
CT2‧‧‧第二控制訊號 CT2‧‧‧second control signal
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