TWI814597B - Driving device of display panel - Google Patents
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- TWI814597B TWI814597B TW111137196A TW111137196A TWI814597B TW I814597 B TWI814597 B TW I814597B TW 111137196 A TW111137196 A TW 111137196A TW 111137196 A TW111137196 A TW 111137196A TW I814597 B TWI814597 B TW I814597B
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Abstract
Description
本發明係關於一種顯示面板的驅動裝置,尤指一種可在顯示面板於高幀率與低幀率間切換時維持其顯示亮度不變的驅動裝置。 The present invention relates to a driving device for a display panel, and in particular, to a driving device that can maintain the display brightness of the display panel when switching between a high frame rate and a low frame rate.
在內嵌式(in-cell)觸控顯示面板的應用中,當面板進行顯示的幀率(frame rate)由高幀率切換至低幀率時,為讓面板在視效上的變化降到最低,一般是在幀期間(frame period)中,使面板在切換後的顯示與觸控的工作時間維持與切換前的顯示與觸控的工作時間不變,僅透過改變垂直消隱(V-blanking)期間來達成幀期間的變動,藉此,可使不同幀率所對應的幀期間的充電時間皆一致,以降低幀率切換對視效的影響。 In the application of in-cell touch display panels, when the display frame rate of the panel switches from a high frame rate to a low frame rate, in order to reduce the change in visual effects of the panel to The minimum is usually during the frame period, so that the display and touch working time of the panel after switching remains unchanged from the display and touch working time before switching, only by changing the vertical blanking (V- Blanking) period is used to achieve frame period changes, thereby making the charging time of the frame periods corresponding to different frame rates consistent, thereby reducing the impact of frame rate switching on visual effects.
圖1顯示一顯示面板的幀率由120Hz切換至60Hz時的幀期間的示意圖,如前述所述,為讓面板在視效上的變化降到最低,對應60Hz幀率的幀期間的顯示與觸控的工作時間維持與120Hz幀率的幀期間的顯示與觸控的工作時間不變,但增加了對應60Hz幀率的幀期間的垂直消隱期間,據以符合其幀期間的長度。然而,於此增加的垂直消隱期間中,並無對面板進行充電與掃描動作,以120Hz幀率為例,面板的薄膜電晶體(TFT)元件的充電時間約8.3ms,當幀率切換至60Hz, 則整個幀期間會多出8.3ms的垂直消隱期間,由於面板的TFT元件在垂直消隱期間不進行充電,因此,過長的垂直消隱期間將使得面板的TFT元件產生漏電的問題,尤其在高溫環境下,更會致使漏電問題加劇,進而嚴重影響顯示品質。 Figure 1 shows a schematic diagram of the frame period when the frame rate of a display panel is switched from 120Hz to 60Hz. As mentioned above, in order to minimize the change in visual effects of the panel, the display and touch screen during the frame period corresponding to the 60Hz frame rate are The working time of the control remains unchanged from the display and touch working time of the frame period of the 120Hz frame rate, but the vertical blanking period corresponding to the frame period of the 60Hz frame rate is increased to match the length of the frame period. However, during this increased vertical blanking period, there is no charging and scanning action on the panel. Taking the 120Hz frame rate as an example, the charging time of the thin film transistor (TFT) element of the panel is about 8.3ms. When the frame rate switches to 60Hz, Then there will be an extra 8.3ms vertical blanking period during the entire frame period. Since the TFT elements of the panel are not charged during the vertical blanking period, an excessively long vertical blanking period will cause leakage problems in the TFT elements of the panel, especially In a high-temperature environment, the leakage problem will be aggravated, which will seriously affect the display quality.
因此,在習知顯示面板的驅動裝置的設計上,實仍存在有諸多缺失而有予以改善之必要。 Therefore, there are still many shortcomings in the design of the driving device of the conventional display panel and it is necessary to improve them.
本發明之目的主要係在提供一種顯示面板的驅動裝置,其可在顯示面板由高幀率切換至低幀率時,解決因垂直消隱期間增加所導致面板的TFT元件產生漏電的問題。 The main purpose of the present invention is to provide a display panel driving device that can solve the problem of leakage in the TFT elements of the panel caused by the increase in the vertical blanking period when the display panel switches from a high frame rate to a low frame rate.
為達前述目的,本發明提出一種驅動裝置,用於切換不同幀率以驅動一顯示面板進行顯示,該顯示面板具有複數條閘極線,一幀率對應一幀期間,且一幀期間具有一顯示時間及一垂直消隱期間,該驅動裝置具有一閘極驅動器,連接至該複數條閘極線,以依序開啟該複數條閘極線,其中,當該顯示面板由一第一幀率切換至小於該第一幀率的一第二幀率以進行顯示時,該第二幀率對應的幀期間中的顯示時間設定為相同於該第一幀率對應的幀期間中的顯示時間,該第二幀率對應的幀期間中的垂直消隱期間設定為該第一幀率對應的幀期間中的垂直消隱期間加上一延伸垂直消隱期間,且該延伸垂直消隱期間區分為複數個延伸垂直消隱小段,該複數個延伸垂直消隱小段分佈於該第二幀率對應的幀期間的顯示時間中。 In order to achieve the above object, the present invention proposes a driving device for switching different frame rates to drive a display panel for display. The display panel has a plurality of gate lines, one frame rate corresponds to one frame period, and one frame period has a During the display time and a vertical blanking period, the driving device has a gate driver connected to the plurality of gate lines to sequentially turn on the plurality of gate lines, wherein when the display panel changes from a first frame rate When switching to a second frame rate that is smaller than the first frame rate for display, the display time in the frame period corresponding to the second frame rate is set to be the same as the display time in the frame period corresponding to the first frame rate, The vertical blanking period in the frame period corresponding to the second frame rate is set to the vertical blanking period in the frame period corresponding to the first frame rate plus an extended vertical blanking period, and the extended vertical blanking period is divided into A plurality of extended vertical blanking segments are distributed in the display time of the frame period corresponding to the second frame rate.
以上概述與接下來的詳細說明皆為示範性質,是為了進一 步說明本發明的申請專利範圍,而有關本發明的其他目的與優點,將在後續的說明與圖式加以闡述。 The above overview and the detailed description that follows are exemplary in nature and are intended to further The patentable scope of the present invention is further explained, and other objects and advantages of the present invention will be explained in the subsequent descriptions and drawings.
11:驅動裝置 11:Driving device
13:顯示面板 13:Display panel
111:閘極驅動器 111: Gate driver
113:源極驅動器 113: Source driver
115:時序控制單元 115: Timing control unit
GL:閘極線 GL: gate line
DL:源極線 DL: source line
Px:像素 Px: pixel
15:觸控控制器 15:Touch controller
Vsync:垂直同步時間 Vsync: vertical synchronization time
DISP,DISP_1,D1SP_2:顯示時間 DISP,DISP_1,D1SP_2: display time
VB,VB_1,VB_2:垂直消隱期間 VB, VB_1, VB_2: vertical blanking period
GT:閘極線開啟時間段 GT: Gate line opening time period
TP,TP_1,TP_2:觸控時段 TP, TP_1, TP_2: touch period
EVB:延伸垂直消隱期間 EVB: extended vertical blanking period
S:延伸垂直消隱小段 S: Extended vertical blanking segment
圖1顯示一顯示面板的幀率由120Hz切換至60Hz時的幀期間的示意圖。 Figure 1 shows a schematic diagram of the frame period when the frame rate of a display panel is switched from 120 Hz to 60 Hz.
圖2顯示以本發明的驅動裝置驅動一顯示面板的示意圖。 FIG. 2 shows a schematic diagram of driving a display panel using the driving device of the present invention.
圖3顯示驅動一顯示面板進行顯示的幀期間的結構示意圖。 FIG. 3 shows a schematic structural diagram of a frame period for driving a display panel to perform display.
圖4顯示驅動一顯示面板由高幀率切換至低幀率以進行顯示的對應低幀率的幀期間的結構示意圖。 FIG. 4 shows a schematic structural diagram of a frame period corresponding to a low frame rate for driving a display panel to switch from a high frame rate to a low frame rate for display.
為了使本發明的目的、技術方案及優點更加清楚明白,以下結合附圖及實施例,對本發明進行進一步詳細說明。應當理解,此處所描述的具體實施例僅僅用以解釋本發明的實施方式,並不用於限定本發明。 In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the implementation of the present invention and are not intended to limit the present invention.
圖2顯示以本發明的驅動裝置11驅動一顯示面板13的示意圖,其中,驅動裝置11包括一閘極驅動器111、一源極驅動器113及一時序控制單元115,時序控制單元115連接至閘極驅動器111及源極驅動器113,以控制閘極驅動器111及源極驅動器113來進行顯示驅動,顯示面板13具有複數條閘極線GL,複數條源極線DL,及複數個像素Px分別位於複數條閘極線GL與複數條源極線DL的相交處,閘極驅動器111連接至複數條閘極線GL,源極驅動器113連接至複數條
源極線DL,以於顯示面板13進行顯示時,時序控制單元115可控制閘極驅動器111依序開啟複數條閘極線GL,亦即,每一條閘極線GL是於對應的一閘極線開啟時間段GT被開啟,且控制源極驅動器113透過複數條源極線DL將顯示資料寫入對應於開啟的閘極線GL的像素Px。
FIG. 2 shows a schematic diagram of driving a
可選擇地,前述顯示面板13亦可為提供觸控感應功能的顯示面板,例如藉由切割顯示面板13的公共電極來作為觸控感應器(圖未示),觸控感應器感應使用者手指之觸摸而將觸控訊號傳送至觸控控制器15以進行觸摸偵測而實現觸控感應功能,其中,切割公共電極作為觸控感應器為本領域技術人士所知,故在此不在贅述。也就是說,在一實施例中,前述顯示面板13可以是提供具備觸控感應及顯示等功能的觸控顯示面板。
Optionally, the
以前述驅動裝置11之驅動,顯示面板13可切換於不同幀率(frame rate)來進行顯示,其中,一幀率對應一幀期間(frame period),一幀期間具有一顯示時間、一垂直消隱期間及一垂直同步時間,其中,顯示時間包括複數個閘極線開啟時間段。因此,如圖3所示,於驅動裝置11驅動顯示面板13進行顯示的一幀期間包括垂直同步時間Vsync、顯示時間DISP及垂直消隱期間VB,其中,顯示時間DISP的長度為複數條閘極線GL的閘極線開啟時間段GT的總和,且當顯示面板13提供觸控功能時,前述垂直消隱期間VB是作為進行碰觸感測的觸控時段TP。
Driven by the
特定地,前述顯示面板13可由一第一幀率切換至一第二幀率以進行顯示,其中,第二幀率低於第一幀率,例如但非限定,第一幀率可為120Hz,第二幀率可為60Hz。如圖4所示,依據前述說明,
當顯示面板13以一第一幀率進行顯示時,對應第一幀率的幀期間包括垂直同步時間Vsync、顯示時間DISP_1及垂直消隱期間VB_1,且此垂直消隱期間VB_1作為觸控時段TP_1。
Specifically, the
再請參照圖4,當顯示面板13切換至第二幀率以進行顯示時,則對應第二幀率的幀期間包括垂直同步時間Vsync、顯示時間DISP_2及垂直消隱期間VB_2,其中,於第二幀率對應的幀期間中,顯示時間DISP_2設定為相同於第一幀率對應的幀期間中的顯示時間DISP_1,垂直消隱期間VB_2設定為第一幀率對應的幀期間中的垂直消隱期間VB_1加上一延伸垂直消隱期間EVB,以藉由加上此延伸垂直消隱期間EVB而使得整個幀期間的長度可以符合第二幀率對應的幀期間的長度。
Please refer to FIG. 4 again. When the
而前述延伸垂直消隱期間EVB並非為一連續的時間段,而是區分為複數個延伸垂直消隱小段S,且複數個延伸垂直消隱小段S是分佈於第二幀率對應的幀期間的顯示時間DISP_2中。 The aforementioned extended vertical blanking period EVB is not a continuous time period, but is divided into a plurality of extended vertical blanking sub-segments S, and the plurality of extended vertical blanking sub-segments S are distributed in the frame period corresponding to the second frame rate. Display time DISP_2.
再請參照圖4所示,前述顯示時間DISP_2包括複數個閘極線開啟時間段GT,複數個延伸垂直消隱小段S的一延伸垂直消隱小段S為穿插於接續的兩個閘極線開啟時間段GT之中,據此,複數個延伸垂直消隱小段S可平均地分佈於顯示時間DISP_2中,或是可不規則地、非週期性地或隨機地分佈於顯示時間DISP_2中,因而可避免因面板的TFT元件在過長的消隱期間不進行充電所導致面板的TFT元件產生漏電的問題。 Please refer to Figure 4 again. The aforementioned display time DISP_2 includes a plurality of gate line turn-on time periods GT. An extended vertical blanking section S of a plurality of extended vertical blanking sections S is interspersed with the turn-on of two consecutive gate lines. In the time period GT, according to this, the plurality of extended vertical blanking segments S can be evenly distributed in the display time DISP_2, or can be irregularly, non-periodic or randomly distributed in the display time DISP_2, thus avoiding Because the TFT elements of the panel are not charged during an excessively long blanking period, the TFT elements of the panel have leakage problems.
此外,於圖4所示的第二幀率對應的幀期間中,前述複數個延伸垂直消隱小段S的數目為小於複數個閘極線開啟時間段GT的數目,一個延伸垂直消隱小段S的長度大於一個閘極線開啟時間段GT的 長度,幀期間的垂直同步時間Vsync是位於幀期間的起始位置處,且幀期間具有一觸控時段TP_2,其長度等於第一幀率對應的幀期間的垂直消隱期間VB_1,此觸控時段TP_2位於幀期間的結束位置處。在一實施例中,每一延伸垂直消隱小段S的長度可以是彼此相等,或不相等,在此並不限定。 In addition, in the frame period corresponding to the second frame rate shown in FIG. 4 , the number of the plurality of extended vertical blanking segments S is less than the number of the plurality of gate line on-time periods GT. One extended vertical blanking segment S The length is greater than one gate line on-time period GT length, the vertical synchronization time Vsync of the frame period is located at the starting position of the frame period, and the frame period has a touch period TP_2, the length of which is equal to the vertical blanking period VB_1 of the frame period corresponding to the first frame rate. This touch period Period TP_2 is located at the end of the frame period. In one embodiment, the lengths of each extended vertical blanking segment S may be equal to each other or unequal, which is not limited here.
由以上之說明可知,以本發明的顯示面板的驅動裝置,當顯示面板由高幀率切換至低幀率以進行顯示時,會將因幀率切換所增加的延伸垂直消隱期間區分為複數個延伸垂直消隱小段,並使得複數個延伸垂直消隱小段分佈於低幀率對應的幀期間的顯示時間中,因而可避免因面板的TFT元件在過長的消隱時間不進行充電所導致面板的TFT元件產生漏電的間題,進而有效確保顯示的品質。 From the above description, it can be seen that with the display panel driving device of the present invention, when the display panel switches from a high frame rate to a low frame rate for display, the extended vertical blanking period increased by the frame rate switching will be divided into a plurality of Extended vertical blanking segments, and the plurality of extended vertical blanking segments are distributed in the display time of the frame period corresponding to the low frame rate, thereby avoiding the problem caused by the TFT element of the panel not charging during the too long blanking time. The TFT elements of the panel cause leakage problems, thus effectively ensuring the quality of the display.
上述實施例僅係為了方便說明而舉例而已,本發明所主張之權利範圍自應以申請專利範圍所述為準,而非僅限於上述實施例。 The above-mentioned embodiments are only examples for convenience of explanation. The scope of rights claimed by the present invention shall be subject to the scope of the patent application and shall not be limited to the above-mentioned embodiments.
Vsync:垂直同步時間 Vsync: vertical synchronization time
DISP_1,DISP_2:顯示時間 DISP_1,DISP_2: display time
VB_1,VB_2:垂直消隱期間 VB_1, VB_2: vertical blanking period
GT:閘極線開啟時間段 GT: Gate line opening time period
TP_1,TP_2:觸控時段 TP_1, TP_2: Touch period
EVB:延伸垂直消隱期間 EVB: extended vertical blanking period
S:延伸垂直消隱小段 S: Extended vertical blanking segment
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US20220101794A1 (en) * | 2020-09-28 | 2022-03-31 | Samsung Display Co., Ltd. | Variable frequency display device |
TW202236250A (en) * | 2021-03-11 | 2022-09-16 | 聯詠科技股份有限公司 | Timing control device and control method thereof |
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TW202141452A (en) * | 2020-04-17 | 2021-11-01 | 敦泰電子股份有限公司 | Amoled display driver with frame rate switching |
US20220101794A1 (en) * | 2020-09-28 | 2022-03-31 | Samsung Display Co., Ltd. | Variable frequency display device |
TW202236250A (en) * | 2021-03-11 | 2022-09-16 | 聯詠科技股份有限公司 | Timing control device and control method thereof |
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