TWI440008B - Display capable of improving frame quality and method thereof - Google Patents
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Description
本發明係有關於一種可改善畫面品質的顯示器及其方法，尤指一種利用源極驅動電路在掃描起始訊號前後輸出的資料的極性相同，以改善顯示面板在顯示區間的畫面品質的顯示器及其方法。The present invention relates to a display and a method thereof for improving picture quality, and more particularly to a display that uses the source drive circuit to output the same polarity before and after the scan start signal to improve the picture quality of the display panel in the display interval. Its method.
請參照第1圖，第1圖係為先前技術說明當顯示面板102更新畫面時，顯示面板102上方出現亮帶的示意圖。現行顯示面板102係採用高開口設計及補償動作的方式，以提高顯示面板102的透過率及改善顯示面板102的串音現象(cross talk)，但顯示面板102的高開口設計及補償動作的方式卻會造成顯示面板102本身的電容值變大。因此，如第1圖所示，當顯示面板102更新畫面時，因為顯示面板102的第一列像素的共同電壓受到顯示資料極性的影響，導致顯示面板102上方出現亮帶。Please refer to FIG. 1 . FIG. 1 is a schematic diagram showing a bright band appearing above the display panel 102 when the display panel 102 updates the screen. The current display panel 102 adopts a high opening design and a compensation operation to improve the transmittance of the display panel 102 and improve the cross talk of the display panel 102, but the high opening design of the display panel 102 and the manner of compensating the operation However, the capacitance value of the display panel 102 itself becomes large. Therefore, as shown in FIG. 1, when the display panel 102 updates the screen, since the common voltage of the first column of pixels of the display panel 102 is affected by the polarity of the display material, a bright band appears above the display panel 102.
請參照第2圖，第2圖係為先前技術說明在顯示面板的顯示區間(active time)VA 與空白區間(blank time)VB ，掃描起始訊號STV、源極驅動電路的輸出資料data及共同電壓Vcom的示意圖。如第2圖所示，顯示面板的時序控制器(TCON)在空白區間VB 時，會控制源極驅動電路的輸出資料維持前一個畫面的最後一筆資料。當源極驅動電路輸出下一個畫面的第一筆資料時，極性才會進行變化。因此，在顯示區間VA 與空白區間VB 的交接處可能會因空白區間VB 的最後一筆資料與顯示區間VA 的第一筆資料的電壓差過大(第2圖的虛線方框)，導致共同電壓Vcom受到資料的電壓耦合的影響產生較大的變動(第2圖的虛線圓框中的尖端)。Please refer to FIG. 2 , which is a prior art description of the active time V A and the blank time V B of the display panel, the scan start signal STV, and the output data of the source drive circuit. And a schematic diagram of the common voltage Vcom. As shown in Fig. 2, when the timing controller (TCON) of the display panel is in the blank interval V B , the output data of the source driving circuit is controlled to maintain the last data of the previous screen. The polarity changes when the source driver circuit outputs the first data of the next picture. Therefore, at the intersection of the display interval V A and the blank interval V B , the voltage difference between the last data of the blank interval V B and the first data of the display interval V A may be too large (the dotted line block of FIG. 2). This causes the common voltage Vcom to be greatly affected by the voltage coupling of the data (the tip of the dotted circle in Fig. 2).
請參照第3圖，第3圖係為說明顯示面板中的複數個像素單元的示意圖。如第3圖所示，源極線302與共同電壓線(common Line)304之間存在寄生電容CSK，當源極線302上資料電壓的極性轉變時，源極線302上資料電壓會透過寄生電容CSK的耦合作用影響共同電壓線304上的電壓。因此，如果薄膜電晶體306根據閘極線308上的訊號關閉，且共同電壓線304上的電壓準位尚未回復至共同電壓Vcom的直流電壓值準位，則儲存電容CS所儲存的電壓會受到影響，導致像素的亮度不穩定。另外，因為在提高顯示面板透過率的設計因素下，寄生電容CSK的電容值會變大，所以由共同電壓線304上的電壓準位回復至共同電壓Vcom的直流電壓準位所需的時間會被拉長。因此，源極線302上資料電壓的極性於下一個畫面進行切換時，共同電壓Vcom受到耦合作用的影響而無法立即回復，導致第2圖的共同電壓Vcom的尖端值更大。Please refer to FIG. 3, which is a schematic diagram illustrating a plurality of pixel units in the display panel. As shown in FIG. 3, there is a parasitic capacitance CSK between the source line 302 and the common voltage line 304. When the polarity of the data voltage on the source line 302 changes, the data voltage on the source line 302 passes through the parasitic The coupling of the capacitor CSK affects the voltage across the common voltage line 304. Therefore, if the thin film transistor 306 is turned off according to the signal on the gate line 308, and the voltage level on the common voltage line 304 has not returned to the DC voltage level of the common voltage Vcom, the voltage stored in the storage capacitor CS is affected. The effect is that the brightness of the pixel is unstable. In addition, since the capacitance value of the parasitic capacitance CSK becomes larger under the design factor of increasing the transmittance of the display panel, the time required for the voltage level on the common voltage line 304 to return to the DC voltage level of the common voltage Vcom will be Being stretched. Therefore, when the polarity of the data voltage on the source line 302 is switched on the next screen, the common voltage Vcom is affected by the coupling action and cannot be immediately recovered, resulting in a larger tip value of the common voltage Vcom of FIG.
本發明的一實施例提供一種可改善畫面品質的顯示器。該顯示器包含一顯示面板、一時序控制器及一源極驅動電路。該時序控制器產生一掃描起始訊號，於該掃描起始訊號產生之前的一顯示面板的一空白區間，以接收一外部資料致能(data enable)訊號，該時序控制器將該外部資料致能訊號做處理，產生一內部資料致能訊號；該源極驅動電路根據該內部資料致能訊號，輸出複數筆資料；其中在該掃描起始訊號產生前的至少一筆資料的極性與該掃描起始訊號產生後的第一筆資料之極性相同。An embodiment of the present invention provides a display that can improve picture quality. The display comprises a display panel, a timing controller and a source driving circuit. The timing controller generates a scan start signal to receive an external data enable signal in a blank interval of the display panel before the scan start signal is generated, and the timing controller causes the external data to The signal can be processed to generate an internal data enable signal; the source drive circuit outputs a plurality of data according to the internal data enable signal; wherein the polarity of at least one data before the scan start signal is generated and the scan The first data after the initial signal is generated has the same polarity.
本發明的另一實施例提供一種可改善畫面品質的方法。該方法包含於一掃描起始訊號產生之前的一顯示面板的一空白區間，接收一外部資料致能訊號；一時序控制器將該外部資料致能訊號做處理，產生一內部資料致能訊號；根據該內部資料致能訊號，輸出複數筆資料，其中在該掃描起始訊號產生前的至少一筆資料的極性與該掃描起始訊號產生後的第一筆資料之極性相同。Another embodiment of the present invention provides a method of improving picture quality. The method includes receiving, by a timing controller, an external data enable signal in a blank interval of a display panel before the scan start signal is generated; and a timing controller processing the external data enable signal to generate an internal data enable signal; And outputting the plurality of data according to the internal data enabling signal, wherein the polarity of the at least one data before the scanning start signal is generated is the same as the polarity of the first data after the scanning start signal is generated.
本發明提供一種可改善畫面品質的顯示器及其方法。該顯示器及其方法係利用一時序控制器於一掃描起始訊號產生之前的一顯示面板的一空白區間，接收一外部資料致能訊號，且將該外部資料致能訊號做處理，產生一內部資料致能訊號。然後，一源極驅動電路根據一資料致能訊號，輸出複數筆資料；其中在該掃描起始訊號產生前的至少一筆資料的極性與該掃描起始訊號產生後的一第一筆資料之極性相同。如此，該顯示面板即可根據該顯示面板的第一列像素對應於該掃描起始訊號前的該至少一筆資料的共同電壓極性和該第一列像素對應於該掃描起始訊號後的該第一筆資料的共同電壓極性，以改善該顯示面板在一顯示區間的畫面品質。The present invention provides a display and method thereof that can improve picture quality. The display and the method thereof use a timing controller to receive an external data enable signal in a blank interval of a display panel before a scan start signal is generated, and process the external data enable signal to generate an internal Data enable signal. Then, a source driving circuit outputs a plurality of data according to a data enabling signal; wherein a polarity of at least one data before the scanning start signal is generated and a polarity of a first data after the scanning start signal is generated the same. In this way, the display panel can be based on the common voltage polarity of the at least one piece of data before the scan start signal and the first column of pixels corresponding to the scan start signal according to the first column of pixels of the display panel. The common voltage polarity of a piece of data to improve the picture quality of the display panel in a display interval.
請參照第4圖和第5圖，第4圖係為本發明的一實施例說明一種可改善畫面品質的顯示器400的示意圖，和第5圖係為說明外部資料致能訊號EDES、內部資料致能訊號DES、掃描起始訊號STV、源極驅動電路406在掃描起始訊號STV前後輸出的資料DL、D1和資料DL、D1的時序示意圖。如第4圖所示，顯示器400包含一顯示面板402、一時序控制器404及一源極驅動電路406。如第4圖和第5圖所示，時序控制器404產生一掃描起始訊號STV，並於掃描起始訊號STV產生之前的顯示面板402的一空白區間VB ，接收一外部資料致能訊號EDES，且經由時序控制器404將外部資料致能訊號EDES做處理，產生一內部資料致能訊號DES，亦即資料致能訊號DES係領先於顯示面板402的掃描起始訊號STV。源極驅動電路406根據資料致能訊號DES，輸出複數筆資料至顯示面板402，其中源極驅動電路406在掃描起始訊號STV產生前所輸出的一筆資料DL的極性與掃描起始訊號STV產生後所輸出的第一筆資料D1之極性準位相同(如第5圖的極性反轉訊號POL所示)。但本發明並不受限於源極驅動電路406在掃描起始訊號STV產生前所輸出的一筆資料DL的極性與掃描起始訊號STV產生後所輸出的第一筆資料D1之極性相同，亦即源極驅動電路406在掃描起始訊號STV產生前所輸出的至少一筆資料的極性與掃描起始訊號STV產生後所輸出的第一筆資料D1之極性相同，即落入本發明的範疇。顯示器400另包含的一閘極驅動電路408可根據掃描起始訊號STV逐列開啟顯示面板402所包含的複數個像素，因此，顯示面板402所包含的複數個像素即可根據複數筆資料，顯示複數筆資料所代表的影像。亦即於掃描起始訊號STV之後係為顯示面板402的一顯示區間VA 。另外，在二連續掃描起始訊號之間係包含一顯示區間與一空白區間。Referring to FIG. 4 and FIG. 5, FIG. 4 is a schematic diagram showing a display 400 capable of improving picture quality according to an embodiment of the present invention, and FIG. 5 is a diagram illustrating an external data enable signal EDES and internal data. A timing diagram of the data DL, D1 and the data DL, D1 outputted by the signal DES, the scan start signal STV, and the source drive circuit 406 before and after the scan start signal STV. As shown in FIG. 4, the display 400 includes a display panel 402, a timing controller 404, and a source driving circuit 406. As shown in FIG. 4 and FIG. 5, the timing controller 404 generates a scan start signal STV and receives an external data enable signal at a blank interval V B of the display panel 402 before the scan start signal STV is generated. The EDES, and the external data enable signal EDES is processed by the timing controller 404 to generate an internal data enable signal DES, that is, the data enable signal DES is ahead of the scan start signal STV of the display panel 402. The source driving circuit 406 outputs a plurality of data to the display panel 402 according to the data enable signal DES. The polarity of the data DL outputted by the source driving circuit 406 before the scan start signal STV is generated and the scan start signal STV are generated. The polarity information of the first data D1 outputted later is the same (as indicated by the polarity inversion signal POL in FIG. 5). However, the present invention is not limited to the polarity of the data DL outputted by the source driving circuit 406 before the scanning start signal STV is generated, and the polarity of the first data D1 output after the scanning start signal STV is generated. That is, the polarity of the at least one data outputted by the source driving circuit 406 before the scanning start signal STV is generated is the same as the polarity of the first data D1 output after the scanning start signal STV is generated, that is, falls within the scope of the present invention. The display device 400 further includes a gate driving circuit 408 for enabling the plurality of pixels included in the display panel 402 to be sequentially displayed according to the scanning start signal STV. Therefore, the plurality of pixels included in the display panel 402 can be displayed according to the plurality of data. The image represented by the multiple data. That is, after the scan start signal STV, it is a display interval V A of the display panel 402. In addition, a display interval and a blank interval are included between the two consecutive scan start signals.
請參照第6圖，第6圖係為說明掃描起始訊號STV、源極驅動電路406在掃描起始訊號STV前後輸出的資料DL、D1和共同電壓Vcom示意圖。如第6圖所示，由於源極驅動電路406在掃描起始訊號STV產生前所輸出的一筆資料DL的極性與掃描起始訊號STV產生後所輸出的第一筆資料D1之極性相同，所以顯示面板402的複數個像素中的第一列像素對應於資料DL的共同電壓係相近於第一列像素對應於第一筆資料D1的共同電壓(第6圖圓圈處)。但本發明並不受限於顯示面板402根據掃描起始訊號STV，從第一列像素開始掃描，亦即顯示面板402根據掃描起始訊號STV，亦可從最後一列像素開始掃描。如果顯示面板402係從最後一列像素開始掃描，則顯示面板402的複數個像素中的最後一列像素對應於資料DL的共同電壓係相近於最後一列像素對應於第一筆資料D1的共同電壓。因此，顯示面板402可根據第一列像素對應於資料DL的共同電壓和第一列像素對應於第一筆資料D1的共同電壓，以改善顯示面板402在顯示區間VA 的畫面品質(亦即顯示面板102上方不會出現亮帶)。Please refer to FIG. 6. FIG. 6 is a schematic diagram illustrating the data DL, D1 and the common voltage Vcom outputted before and after the scan start signal STV by the scan start signal STV and the source drive circuit 406. As shown in FIG. 6, since the polarity of the data DL outputted by the source driving circuit 406 before the scanning start signal STV is generated is the same as the polarity of the first data D1 output after the scanning start signal STV is generated, The first column of the plurality of pixels of the display panel 402 corresponds to a common voltage of the data DL which is close to the common voltage of the first column of pixels corresponding to the first data D1 (at the circle of FIG. 6). However, the present invention is not limited to the display panel 402 scanning from the first column of pixels according to the scan start signal STV, that is, the display panel 402 can also scan from the last column of pixels according to the scan start signal STV. If the display panel 402 is scanned from the last column of pixels, the last column of the plurality of pixels of the display panel 402 corresponds to a common voltage of the data DL that is close to the common voltage of the last column of pixels corresponding to the first data D1. Therefore, the display panel 402 can improve the picture quality of the display panel 402 in the display interval V A according to the common voltage of the first column of pixels corresponding to the data DL and the common voltage of the first column of pixels corresponding to the first pen data D1 (ie, No bright band appears above the display panel 102).
請參照第7圖，第7圖係為本發明的另一實施例說明一種可改善畫面品質的方法的流程圖。第7圖之方法係利用第4圖的顯示器400說明，詳細步驟如下：步驟700：開始；步驟702：時序控制器404於掃描起始訊號STV產生之前的顯示面板402的空白區間VB ，接收外部資料致能訊號EDES；步驟704：時序控制器404將外部資料致能訊號EDES做處理，產生內部資料致能訊號DES；步驟706：源極驅動電路406根據資料致能訊號DES，輸出複數筆資料；步驟708：時序控制器404產生掃描起始訊號STV，跳至步驟702。Please refer to FIG. 7. FIG. 7 is a flow chart showing a method for improving picture quality according to another embodiment of the present invention. The method of FIG. 7 is illustrated by the display 400 of FIG. 4. The detailed steps are as follows: Step 700: Start; Step 702: The timing controller 404 receives the blank interval V B of the display panel 402 before the scan start signal STV is generated, and receives External data enable signal EDES; Step 704: The timing controller 404 processes the external data enable signal EDES to generate an internal data enable signal DES; Step 706: The source drive circuit 406 outputs a plurality of pens according to the data enable signal DES Data step 708: The timing controller 404 generates a scan start signal STV, and jumps to step 702.
請參照第5圖和第6圖。在步驟704中，因為時序控制器404係將外部資料致能訊號EDES做處理，產生內部資料致能訊號DES，所以內部資料致能訊號DES係領先於顯示面板402的掃描起始訊號STV。亦即時序控制器404在顯示面板402的空白區間VB ，產生資料致能訊號DES。在步驟706中，源極驅動電路406根據內部資料致能訊號DES，輸出複數筆資料至顯示面板402，其中源極驅動電路406在掃描起始訊號STV產生前所輸出的一筆資料DL的極性與掃描起始訊號STV產生後所輸出的第一筆資料D1之極性相同。但在本發明中，只要源極驅動電路406在掃描起始訊號STV產生前所輸出的至少一筆資料的極性與掃描起始訊號STV產生後所輸出的第一筆資料D1之極性相同，即落入本發明的範疇。在步驟708中，顯示器400的閘極驅動電路408即可根據掃描起始訊號STV逐列開啟顯示面板402所包含的複數個像素，因此，顯示面板402所包含的複數個像素即可根據複數筆資料，顯示複數筆資料所代表的影像，亦即於掃描起始訊號STV之後係為顯示面板402的顯示區間VA 。如第6圖所示，由於源極驅動電路406在掃描起始訊號STV產生前所輸出的一筆資料DL的極性與掃描起始訊號STV產生後所輸出的第一筆資料D1之極性相同，所以顯示面板402的複數個像素中的第一列像素對應於資料DL的共同電壓係相近於第一列像素對應於第一筆資料D1的共同電壓。因此，顯示面板402可根據第一列像素對應於資料DL的共同電壓和第一列像素對應於第一筆資料D1的共同電壓，以改善顯示面板402在顯示區間VA 的畫面品質(亦即顯示面板102上方不會出現亮帶)。Please refer to Figure 5 and Figure 6. In step 704, since the timing controller 404 processes the external data enable signal EDES to generate the internal data enable signal DES, the internal data enable signal DES is ahead of the scan start signal STV of the display panel 402. That is, the timing controller 404 generates a data enable signal DES in the blank interval V B of the display panel 402. In step 706, the source driving circuit 406 outputs a plurality of data to the display panel 402 according to the internal data enable signal DES. The polarity of the data DL output by the source driving circuit 406 before the scan start signal STV is generated is The polarity of the first data D1 output after the scan start signal STV is generated is the same. However, in the present invention, as long as the polarity of the at least one data outputted by the source driving circuit 406 before the scanning start signal STV is generated is the same as the polarity of the first data D1 output after the scanning start signal STV is generated, Within the scope of the invention. In step 708, the gate driving circuit 408 of the display 400 can turn on the plurality of pixels included in the display panel 402 column by column according to the scanning start signal STV. Therefore, the plurality of pixels included in the display panel 402 can be based on the plurality of pixels. The data indicates the image represented by the plurality of data, that is, the display interval V A of the display panel 402 after the scan start signal STV. As shown in FIG. 6, since the polarity of the data DL outputted by the source driving circuit 406 before the scanning start signal STV is generated is the same as the polarity of the first data D1 output after the scanning start signal STV is generated, The first column of the plurality of pixels of the display panel 402 corresponds to a common voltage of the data DL which is close to the common voltage of the first column of pixels corresponding to the first data D1. Therefore, the display panel 402 can improve the picture quality of the display panel 402 in the display interval V A according to the common voltage of the first column of pixels corresponding to the data DL and the common voltage of the first column of pixels corresponding to the first pen data D1 (ie, No bright band appears above the display panel 102).
綜上所述，本發明所提供的可改善畫面品質的顯示器及其方法，係利用時序控制器於掃描起始訊號產生之前的顯示面板的空白區間，接收外部資料致能訊號，經由時序控制器將外部資料致能訊號做處理，產生內部資料致能訊號。然後，源極驅動電路根據內部資料致能訊號，輸出複數筆資料；其中在掃描起始訊號產生前的至少一筆資料的極性與掃描起始訊號產生後的第一筆資料之極性相同。如此，顯示面板即可根據顯示面板的第一列像素對應於掃描起始訊號前的至少一筆資料的共同電壓極性和第一列像素對應於掃描起始訊號後的第一筆資料的共同電壓極性，以改善顯示面板在顯示區間的畫面品質。In summary, the display and method for improving picture quality provided by the present invention use a timing controller to receive an external data enable signal through a timing controller in a blank interval of a display panel before a scan start signal is generated. The external data enable signal is processed to generate an internal data enable signal. Then, the source driving circuit outputs the plurality of data according to the internal data enabling signal; wherein the polarity of the at least one data before the scanning start signal is generated is the same as the polarity of the first data after the scanning start signal is generated. In this way, the display panel can correspond to the common voltage polarity of at least one piece of data before the scan start signal and the common voltage polarity of the first line of pixels corresponding to the first piece of data after the scan start signal according to the first column of pixels of the display panel. To improve the picture quality of the display panel in the display interval.
以上所述僅為本發明之較佳實施例，凡依本發明申請專利範圍所做之均等變化與修飾，皆應屬本發明之涵蓋範圍。The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.
102．．．顯示面板102. . . Display panel
302．．．源極線302. . . Source line
304．．．共同電壓線304. . . Common voltage line
306．．．薄膜電晶體306. . . Thin film transistor
308．．．閘極線308. . . Gate line
400．．．顯示器400. . . monitor
402．．．顯示面板402. . . Display panel
404．．．時序控制器404. . . Timing controller
406．．．源極驅動電路406. . . Source drive circuit
408．．．閘極驅動電路408. . . Gate drive circuit
CS．．．儲存電容CS. . . Storage capacitor
CSK．．．寄生電容CSK. . . Parasitic capacitance
data．．．輸出資料Data. . . Output data
DL．．．空白區間最後一筆資料DL. . . Blank interval last data
D1．．．顯示區間第一筆資料D1. . . Display interval first data
DES．．．內部資料致能訊號DES. . . Internal data enable signal
EDES．．．外部資料致能訊號EDES. . . External data enable signal
POL．．．極性反轉訊號POL. . . Polarity reversal signal
STV．．．掃描起始訊號STV. . . Scanning start signal
VA ．．．顯示區間V A . . . Display interval
VB ．．．空白區間V B . . . Blank interval
Vcom．．．共同電壓Vcom. . . Common voltage
700至708．．．步驟700 to 708. . . step
第1圖係為先前技術說明當顯示面板更新畫面時，顯示面板上方出現亮帶的示意圖。Fig. 1 is a schematic view showing a bright band appearing above the display panel when the display panel updates the screen.
第2圖係為先前技術說明在顯示面板的顯示區間與空白區間，掃描起始訊號、源極驅動電路的輸出資料及共同電壓的示意圖。Fig. 2 is a schematic diagram showing the scanning start signal, the output data of the source driving circuit, and the common voltage in the display section and the blank section of the display panel in the prior art.
第3圖係為說明顯示面板中的複數個像素單元的示意圖。Figure 3 is a schematic diagram illustrating a plurality of pixel units in a display panel.
第4圖係為本發明的一實施例說明一種可改善畫面品質的顯示器的示意圖。Figure 4 is a schematic diagram showing a display capable of improving picture quality according to an embodiment of the present invention.
第5圖係為說明外部資料致能訊號、內部資料致能訊號、掃描起始訊號、源極驅動電路在掃描起始訊號前後輸出的資料和資料的時序示意圖。Figure 5 is a timing diagram showing the data and data outputted by the external data enable signal, the internal data enable signal, the scan start signal, and the source drive circuit before and after the scan start signal.
第6圖係為說明掃描起始訊號、源極驅動電路在掃描起始訊號前後輸出的資料和共同電壓極性示意圖。Figure 6 is a schematic diagram showing the scanning start signal, the data outputted by the source driving circuit before and after the scanning start signal, and the common voltage polarity.
第7圖係為本發明的另一實施例說明一種可改善畫面品質的方法的流程圖。Figure 7 is a flow chart illustrating a method for improving picture quality in accordance with another embodiment of the present invention.
400．．．顯示器400. . . monitor
402．．．顯示面板402. . . Display panel
404．．．時序控制器404. . . Timing controller
406．．．源極驅動電路406. . . Source drive circuit
408．．．閘極驅動電路408. . . Gate drive circuit
DES．．．內部資料致能訊號DES. . . Internal data enable signal
EDES．．．外部資料致能訊號EDES. . . External data enable signal
STV．．．掃描起始訊號STV. . . Scanning start signal
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