TW202234366A - Power-saving source driver chip, and liquid crystal display and information processing device using the same wherein the power-saving source driver chip includes a detection circuit and a charge sharing control circuit - Google Patents
Power-saving source driver chip, and liquid crystal display and information processing device using the same wherein the power-saving source driver chip includes a detection circuit and a charge sharing control circuit Download PDFInfo
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Description
本發明係有關省電型源極驅動晶片,尤指一種可節省液晶顯示器功耗之省電型源極驅動晶片。The present invention relates to a power-saving source driver chip, in particular to a power-saving source driver chip that can save the power consumption of a liquid crystal display.
為了節省液晶顯示器的功耗,習知已有電荷分享的技術方案被提出。請參照圖1,其繪示一習知液晶顯示器之一電荷分享控制電路方塊圖。如圖1所示,該電荷分享控制電路包括一時序控制器11、一極性變換偵測單元12、一源極驅動器13及一TFT液晶陣列14。In order to save the power consumption of the liquid crystal display, the conventional technical solution of charge sharing is proposed. Please refer to FIG. 1 , which shows a block diagram of a charge sharing control circuit of a conventional liquid crystal display. As shown in FIG. 1 , the charge sharing control circuit includes a
時序控制器11係用以傳送一極性信號S
P至極性變換偵測單元12,其中,當時序控制器11依據顯示資料判斷出有靜止的局部畫面時,會改變極性信號S
P的極性,使其由正變負或由負變正,以使畫素電壓由一參考電壓(共通電壓)之上方/下方變成在該參考電壓(共通電壓)之下方/上方,以避免TFT液晶陣列14的液晶分子產生無法恢復原狀的彈性疲乏現象。
The
極性變換偵測單元12在偵測到兩個相鄰的極性信號S
P的極性相反時會使一電荷分享致能信號C
CS呈現作用狀態,且源極驅動器13在電荷分享致能信號C
CS呈現作用狀態時會驅動其內部之一開關電路,以促使TFT液晶陣列14在其多個資料通道間進行電荷分享,以節省建立下一幀畫面的畫素電壓所需的電荷量。
When the polarity
然而,圖1之電荷分享控制電路僅能在畫素電壓的極性有指示要變換時才會進行電荷分享,對於未指示要變換畫素電壓的極性的情況下則未進行,因此,其在液晶顯示器的省電方面仍有改進的空間。However, the charge sharing control circuit in FIG. 1 can only perform charge sharing when the polarity of the pixel voltage is instructed to be changed, and does not perform the charge sharing when the polarity of the pixel voltage is not instructed to be changed. There is still room for improvement in the power saving aspect of the display.
為解決上述的問題,本領域亟需一種新穎的源極驅動晶片。To solve the above problems, a novel source driver chip is urgently needed in the art.
本發明之一目的在於提供一種省電型源極驅動晶片,其在時序控制器未指示要變換畫素電壓的極性的情況下,仍可在一行之一畫素灰階大於或等於一第一預定灰階,而另一行之一畫素灰階低於或等於一第二預定灰階時對一TFT液晶陣列進行一電荷分享操作。One object of the present invention is to provide a power-saving source driver chip, which can still have a pixel gray level of a row greater than or equal to a first pixel voltage even when the timing controller does not instruct the polarity of the pixel voltage to be changed. A charge sharing operation is performed on a TFT liquid crystal array when the gray level of one pixel in the other row is lower than or equal to a second predetermined gray level.
本發明之另一目的在於提供一種液晶顯示器,其在時序控制器未指示要變換畫素電壓的極性的情況下,仍可在一行之一畫素灰階大於或等於一第一預定灰階,而另一行之一畫素灰階低於或等於一第二預定灰階時對一TFT液晶陣列進行一電荷分享操作以節省功耗。Another object of the present invention is to provide a liquid crystal display, which can still have a pixel gray level of a row greater than or equal to a first predetermined gray level even when the timing controller does not instruct the polarity of the pixel voltage to be changed. When the gray level of one pixel in the other row is lower than or equal to a second predetermined gray level, a charge sharing operation is performed on a TFT liquid crystal array to save power consumption.
本發明之又一目的在於提供一種資訊處理裝置,其具有前述之液晶顯示器而可節省功耗。Another object of the present invention is to provide an information processing device, which has the aforementioned liquid crystal display and can save power consumption.
為達到前述之目的,一種省電型源極驅動晶片乃被提出,其具有:In order to achieve the aforementioned purpose, a power-saving source driver chip is proposed, which has:
一第一偵測電路,用以偵測一行顯示資料以產生一第一偵測結果,其中,當該行顯示資料中有顯示資料的最高兩個位元皆為1時,使該第一偵測結果呈現作用狀態,反之,則使該第一偵測結果呈現不作用狀態;a first detection circuit for detecting a row of display data to generate a first detection result, wherein when the highest two bits of the display data in the row of display data are both 1, the first detection The detection result is in an active state, otherwise, the first detection result is in an inactive state;
一暫存器,用以依一時脈信號之控制鎖存該第一偵測結果,並據以提供代表該第一偵測結果之先前狀態之一輸出狀態;a register for latching the first detection result according to the control of a clock signal, and providing an output state representing the previous state of the first detection result accordingly;
一第二偵測電路,用以偵測下一行顯示資料以產生一第二偵測結果,其中,當該下一行顯示資料中有顯示資料的最高兩個位元皆為0時,使該第二偵測結果呈現作用狀態,反之,則使該第二偵測結果呈現不作用狀態;以及a second detection circuit for detecting the next line of display data to generate a second detection result, wherein when the highest two bits of the display data in the next line of display data are both 0, the first The second detection result is in an active state, otherwise, the second detection result is in an inactive state; and
一邏輯閘,係在該輸出狀態和該第二偵測結果皆呈現作用狀態時輸出一致能信號以驅使一開關電路對一TFT液晶陣列進行一電荷分享操作。A logic gate outputs an enable signal to drive a switch circuit to perform a charge sharing operation on a TFT liquid crystal array when both the output state and the second detection result are in an active state.
在一實施例中,該邏輯閘係一及閘。In one embodiment, the logic gate is a gate and a gate.
在一實施例中,該邏輯閘係一非或閘。In one embodiment, the logic gate is a NOT-OR gate.
為達到前述之目的,本發明進一步提出一種省電型源極驅動晶片,其具有:In order to achieve the aforementioned purpose, the present invention further provides a power-saving source driver chip, which has:
一偵測電路,用以判斷相鄰兩行的顯示資料的數值差異是否大於一閾值;以及a detection circuit for judging whether the numerical difference between the display data of two adjacent rows is greater than a threshold; and
一電荷分享控制電路,用以在該數值差異大於該閾值時驅使一開關電路對一TFT液晶陣列進行一電荷分享操作。A charge-sharing control circuit is used for driving a switch circuit to perform a charge-sharing operation on a TFT liquid crystal array when the value difference is greater than the threshold.
為達到前述之目的,本發明進一步提出一種液晶顯示器,其具有一省電型源極驅動晶片及一TFT液晶陣列,該省電型源極驅動晶片具有:In order to achieve the aforementioned purpose, the present invention further provides a liquid crystal display, which has a power-saving source driver chip and a TFT liquid crystal array, and the power-saving source driver chip has:
一第一偵測電路,用以偵測一行顯示資料以產生一第一偵測結果,其中,當該行顯示資料中有顯示資料的最高兩個位元皆為1時,使該第一偵測結果呈現作用狀態,反之,則使該第一偵測結果呈現不作用狀態;a first detection circuit for detecting a row of display data to generate a first detection result, wherein when the highest two bits of the display data in the row of display data are both 1, the first detection The detection result is in an active state, otherwise, the first detection result is in an inactive state;
一暫存器,用以依一時脈信號之控制鎖存該第一偵測結果,並據以提供代表該第一偵測結果之先前狀態之一輸出狀態;a register for latching the first detection result according to the control of a clock signal, and providing an output state representing the previous state of the first detection result accordingly;
一第二偵測電路,用以偵測下一行顯示資料以產生一第二偵測結果,其中,當該下一行顯示資料中有顯示資料的最高兩個位元皆為0時,使該第二偵測結果呈現作用狀態,反之,則使該第二偵測結果呈現不作用狀態;以及a second detection circuit for detecting the next line of display data to generate a second detection result, wherein when the highest two bits of the display data in the next line of display data are both 0, the first The second detection result is in an active state, otherwise, the second detection result is in an inactive state; and
一邏輯閘,係在該輸出狀態和該第二偵測結果皆呈現作用狀態時輸出一致能信號以驅使一開關電路對該TFT液晶陣列進行一電荷分享操作。A logic gate outputs an enable signal to drive a switch circuit to perform a charge sharing operation on the TFT liquid crystal array when both the output state and the second detection result are in active states.
在一實施例中,該邏輯閘係一及閘。In one embodiment, the logic gate is a gate and a gate.
在一實施例中,該邏輯閘係一非或閘。In one embodiment, the logic gate is a NOT-OR gate.
為達到前述之目的,本發明進一步提出一種液晶顯示器,其具有一省電型源極驅動晶片及一TFT液晶陣列,該省電型源極驅動晶片具有:In order to achieve the aforementioned purpose, the present invention further provides a liquid crystal display, which has a power-saving source driver chip and a TFT liquid crystal array, and the power-saving source driver chip has:
一偵測電路,用以判斷相鄰兩行的顯示資料的數值差異是否大於一閾值;以及a detection circuit for judging whether the numerical difference between the display data of two adjacent rows is greater than a threshold; and
一電荷分享控制電路,用以在該數值差異大於該閾值時驅使一開關電路對該TFT液晶陣列進行一電荷分享操作。A charge sharing control circuit is used for driving a switch circuit to perform a charge sharing operation on the TFT liquid crystal array when the value difference is greater than the threshold.
為達到前述之目的,本發明進一步提出一種資訊處理裝置,其具有一中央處理單元及一液晶顯示器,其中,該中央處理單元係用以與該液晶顯示器通信,且該液晶顯示器具有一省電型源極驅動晶片及一TFT液晶陣列,該省電型源極驅動晶片具有:In order to achieve the aforementioned object, the present invention further provides an information processing device having a central processing unit and a liquid crystal display, wherein the central processing unit is used for communication with the liquid crystal display, and the liquid crystal display has a power saving type A source driver chip and a TFT liquid crystal array, the power-saving source driver chip has:
一第一偵測電路,用以偵測一行顯示資料以產生一第一偵測結果,其中,當該行顯示資料中有顯示資料的最高兩個位元皆為1時,使該第一偵測結果呈現作用狀態,反之,則使該第一偵測結果呈現不作用狀態;a first detection circuit for detecting a row of display data to generate a first detection result, wherein when the highest two bits of the display data in the row of display data are both 1, the first detection The detection result is in an active state, otherwise, the first detection result is in an inactive state;
一暫存器,用以依一時脈信號之控制鎖存該第一偵測結果,並據以提供代表該第一偵測結果之先前狀態之一輸出狀態;a register for latching the first detection result according to the control of a clock signal, and providing an output state representing the previous state of the first detection result accordingly;
一第二偵測電路,用以偵測下一行顯示資料以產生一第二偵測結果,其中,當該下一行顯示資料中有顯示資料的最高兩個位元皆為0時,使該第二偵測結果呈現作用狀態,反之,則使該第二偵測結果呈現不作用狀態;以及a second detection circuit for detecting the next line of display data to generate a second detection result, wherein when the highest two bits of the display data in the next line of display data are both 0, the first The second detection result is in an active state, otherwise, the second detection result is in an inactive state; and
一邏輯閘,係在該輸出狀態和該第二偵測結果皆呈現作用狀態時輸出一致能信號以驅使一開關電路對該TFT液晶陣列進行一電荷分享操作。A logic gate outputs an enable signal to drive a switch circuit to perform a charge sharing operation on the TFT liquid crystal array when both the output state and the second detection result are in active states.
在一實施例中,該邏輯閘係一及閘。In one embodiment, the logic gate is a gate and a gate.
在一實施例中,該邏輯閘係一非或閘。In one embodiment, the logic gate is a NOT-OR gate.
為達到前述之目的,本發明進一步提出一種資訊處理裝置,其具有一中央處理單元及一液晶顯示器,其中,該中央處理單元係用以與該液晶顯示器通信,且該液晶顯示器具有一省電型源極驅動晶片及一TFT液晶陣列,該省電型源極驅動晶片具有:In order to achieve the aforementioned object, the present invention further provides an information processing device having a central processing unit and a liquid crystal display, wherein the central processing unit is used for communication with the liquid crystal display, and the liquid crystal display has a power saving type A source driver chip and a TFT liquid crystal array, the power-saving source driver chip has:
一偵測電路,用以判斷相鄰兩行的顯示資料的數值差異是否大於一閾值;以及a detection circuit for judging whether the numerical difference between the display data of two adjacent rows is greater than a threshold; and
一電荷分享控制電路,用以在該數值差異大於該閾值時驅使一開關電路對該TFT液晶陣列進行一電荷分享操作。A charge sharing control circuit is used for driving a switch circuit to perform a charge sharing operation on the TFT liquid crystal array when the value difference is greater than the threshold.
在可能的實施例中,該資訊處理裝置可為一攜帶型電腦或一智慧型手持裝置。In a possible embodiment, the information processing device may be a portable computer or a smart handheld device.
本發明之原理在於:The principle of the present invention is:
(一)偵測一行顯示資料以產生一第一偵測結果,其中,當該行顯示資料中有顯示資料的最高兩個位元皆為1時,使該第一偵測結果呈現作用狀態,反之,則使該第一偵測結果呈現不作用狀態;(1) Detecting a row of display data to generate a first detection result, wherein when the highest two bits of the display data in the row of display data are both 1, the first detection result is in an active state, Otherwise, the first detection result is rendered inactive;
(二)暫存該第一偵測結果以提供該第一偵測結果之先前狀態;(2) temporarily storing the first detection result to provide the previous state of the first detection result;
(三)偵測下一行顯示資料以產生一第二偵測結果,其中,當該下一行顯示資料中有顯示資料的最高兩個位元皆為0時,使該第二偵測結果呈現作用狀態,反之,則使該第二偵測結果呈現不作用狀態;以及(3) Detecting the display data of the next line to generate a second detection result, wherein when the highest two bits of the display data in the display data of the next line are both 0, the second detection result is displayed. state, otherwise, the second detection result is rendered inactive; and
(四)在該第一偵測結果之先前狀態和該第二偵測結果皆呈現作用狀態時輸出一致能信號以驅使一開關電路對一TFT液晶陣列進行一電荷分享操作。(4) When the previous state of the first detection result and the second detection result are both active states, output an enable signal to drive a switch circuit to perform a charge sharing operation on a TFT liquid crystal array.
亦即,本發明之省電型源極驅動晶片的原理在於設置一偵測電路及一電荷分享控制電路,藉由該偵測電路判斷相鄰兩行的顯示資料的數值差異是否大於一閾值,並在該數值差異大於該閾值時驅使該電荷分享控制電路驅動一開關電路以對一TFT液晶陣列進行一電荷分享操作。That is, the principle of the power-saving source driver chip of the present invention is to set a detection circuit and a charge sharing control circuit, and the detection circuit determines whether the numerical difference between the display data of two adjacent rows is greater than a threshold value, When the value difference is greater than the threshold value, the charge sharing control circuit is driven to drive a switch circuit to perform a charge sharing operation on a TFT liquid crystal array.
依此,本發明即可在一時序控制器未偵測到顯示資料有靜止畫面而未變換畫素電壓的極性的情況下,對一TFT液晶陣列的兩個相鄰的通道進行一電荷分享操作,以節省該TFT液晶陣列的功耗。Accordingly, the present invention can perform a charge sharing operation on two adjacent channels of a TFT liquid crystal array when the timing controller does not detect that the display data has a still image and does not change the polarity of the pixel voltage. , in order to save the power consumption of the TFT liquid crystal array.
請參照圖2,其繪示包含本發明之省電型源極驅動晶片之一實施例之一液晶顯示器之方塊圖。如圖2所示,一液晶顯示器100包括一省電型源極驅動晶片110及一TFT液晶陣列120。為彰顯本發明之技術特徵,液晶顯示器100中未直接與本發明相關之其它構成元件,例如閘極驅動晶片及背光模組,乃未示於圖2中。Please refer to FIG. 2 , which shows a block diagram of a liquid crystal display including an embodiment of the power-saving source driver chip of the present invention. As shown in FIG. 2 , a
省電型源極驅動晶片110具有一第一偵測電路111、一暫存器112、一第二偵測電路113、一邏輯及閘114及一開關電路115。The power-saving
第一偵測電路111係用以偵測一行顯示資料D
DISPL1以產生一第一偵測結果S
HH,其中,當該行顯示資料D
DISPL1中有顯示資料的最高兩個位元皆為1時,使該第一偵測結果S
HH呈現作用狀態,反之,則使該第一偵測結果S
HH呈現不作用狀態。
The
暫存器112係用以依一時脈信號CLK之控制鎖存該第一偵測結果S
HH,並據以提供代表該第一偵測結果之先前狀態之一輸出狀態S
HHP,亦即,在時脈信號CLK對暫存器112產生鎖存作用前,輸出狀態S
HHP呈現的是該第一偵測結果S
HH之先前狀態。
The
第二偵測電路113係用以偵測下一行顯示資料D
DISPL2以產生一第二偵測結果S
LL,其中,當該下一行顯示資料D
DISPL2中有顯示資料的最高兩個位元皆為0時,使該第二偵測結果S
LL呈現作用狀態,反之,則使該第二偵測結果S
LL呈現不作用狀態。
The
邏輯及閘114係在該輸出狀態S
HHP和該第二偵測結果S
LL皆呈現作用狀態時輸出一致能信號EN以驅使開關電路115對TFT液晶陣列120進行一電荷分享操作。亦即,本發明的省電型源極驅動晶片110在一行之一畫素灰階大於或等於一第一預定灰階(顯示資料的最高兩個位元皆為1僅為一實施例),而另一行之一畫素灰階低於或等於一第二預定灰階(顯示資料的最高兩個位元皆為0僅為一實施例)時會對TFT液晶陣列120進行電荷分享操作。
The logic AND
在此要特別指出的是,邏輯及閘114亦可以其它的邏輯電路取代,例如以邏輯非或閘取代。在採用邏輯及閘114的情況下,所述的作用狀態係指高電位;當以邏輯非或閘取代邏輯及閘114時,所述的作用狀態係指低電位。It should be specially pointed out here that the logic AND
開關電路115係用以在被致能信號EN致能時,使TFT液晶陣列120的兩個相鄰的資料通道中的畫素電容進行電荷重分配,從而降低新的畫素電壓的建立時間。The
依上述的說明,本發明進一步提出一資訊處理裝置。請參照圖3,其繪示本發明之資訊處理裝置之一實施例的方塊圖。如圖3所示,一資訊處理裝置200具有一中央處理單元210及一液晶顯示器220,其中,中央處理單元210係用以與液晶顯示器220通信且液晶顯示器220係由液晶顯示器100實現。另外,資訊處理裝置200可為一攜帶型電腦或一智慧型手持裝置。According to the above description, the present invention further provides an information processing device. Please refer to FIG. 3 , which shows a block diagram of an embodiment of the information processing apparatus of the present invention. As shown in FIG. 3 , an
依上述的說明可知,本發明可提供以下的優點:According to the above description, the present invention can provide the following advantages:
1. 本發明的省電型源極驅動晶片在時序控制器未指示要變換畫素電壓的極性的情況下,仍可在一行之一畫素灰階大於或等於一第一預定灰階,而另一行之一畫素灰階低於或等於一第二預定灰階時對一TFT液晶陣列進行一電荷分享操作。1. In the power-saving source driver chip of the present invention, when the timing controller does not instruct the polarity of the pixel voltage to be changed, the grayscale of one pixel in a row can still be greater than or equal to a first predetermined grayscale, and A charge sharing operation is performed on a TFT liquid crystal array when one pixel gray level of the other row is lower than or equal to a second predetermined gray level.
2.本發明的液晶顯示器在時序控制器未指示要變換畫素電壓的極性的情況下,仍可在一行之一畫素灰階大於或等於一第一預定灰階,而另一行之一畫素灰階低於或等於一第二預定灰階時對一TFT液晶陣列進行一電荷分享操作以節省功耗。2. In the liquid crystal display of the present invention, when the timing controller does not instruct the polarity of the pixel voltage to be changed, the grayscale of one pixel in one row is greater than or equal to a first predetermined grayscale, while the grayscale of one pixel in the other row is greater than or equal to a first predetermined grayscale. When the pixel gray level is lower than or equal to a second predetermined gray level, a charge sharing operation is performed on a TFT liquid crystal array to save power consumption.
3.本發明的資訊處理裝置因具有前述之液晶顯示器而可節省功耗。3. The information processing device of the present invention can save power consumption due to the aforementioned liquid crystal display.
本發明所揭示者,乃較佳實施例之一種,舉凡局部之變更或修飾而源於本發明之技術思想而為熟習該項技藝知人所易於推知者,俱不脫本發明之專利權範疇。What is disclosed in the present invention is one of the preferred embodiments, and any partial changes or modifications originating from the technical idea of the present invention and easily inferred by those skilled in the art are within the scope of the patent right of the present invention.
綜上所陳,本案無論目的、手段與功效,皆顯示其迥異於習知技術,且其首先發明合於實用,確實符合發明之專利要件,懇請 貴審查委員明察,並早日賜予專利俾嘉惠社會,是為至禱。To sum up, regardless of the purpose, means and effect of this case, it shows that it is completely different from the conventional technology, and its first invention is suitable for practical use, and indeed meets the patent requirements of the invention. Society is to pray for the best.
11:時序控制器 12:極性變換偵測單元 13:源極驅動器 14:TFT液晶陣列 100:液晶顯示器 110:省電型源極驅動晶片 111:第一偵測電路 112:暫存器 113:第二偵測電路 114:邏輯及閘 115:開關電路 120:TFT液晶陣列 200:資訊處理裝置 210:中央處理單元 220:液晶顯示器 11: Timing Controller 12: Polarity change detection unit 13: Source driver 14: TFT liquid crystal array 100: LCD display 110: Power-saving source driver chip 111: The first detection circuit 112: Scratchpad 113: Second detection circuit 114: Logic and Gates 115: switch circuit 120: TFT liquid crystal array 200: Information processing device 210: Central Processing Unit 220: LCD display
為進一步揭示本發明之具體技術內容,首先請參閱圖式,其中: 圖1繪示一習知液晶顯示器之一電荷分享控制電路方塊圖。 圖2繪示包含本發明之省電型源極驅動晶片之一液晶顯示器之方塊圖。 圖3繪示本發明之資訊處理裝置之一實施例之方塊圖。 In order to further disclose the specific technical content of the present invention, please refer to the drawings first, wherein: FIG. 1 is a block diagram of a charge sharing control circuit of a conventional liquid crystal display. FIG. 2 is a block diagram of a liquid crystal display including the power-saving source driver chip of the present invention. FIG. 3 is a block diagram illustrating an embodiment of the information processing apparatus of the present invention.
100:液晶顯示器 100: LCD display
110:省電型源極驅動晶片 110: Power-saving source driver chip
111:第一偵測電路 111: The first detection circuit
112:暫存器 112: Scratchpad
113:第二偵測電路 113: Second detection circuit
114:邏輯及閘 114: Logic and Gates
115:開關電路 115: switch circuit
120:TFT液晶陣列 120: TFT liquid crystal array
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