TWI527020B - Circuit and method for generating gamma voltage - Google Patents
Circuit and method for generating gamma voltage Download PDFInfo
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本發明是有關於一種伽瑪電壓產生電路，尤其是有關於一種可在顯示畫面之空白期間產生特定伽瑪電壓值的伽瑪電壓產生電路。 The present invention relates to a gamma voltage generating circuit, and more particularly to a gamma voltage generating circuit that can generate a specific gamma voltage value during a blank of a display picture.
在現今，智慧型裝置與我們的生活越來越密不可分，例如智慧型手機、平板電腦的使用也越來越普及。為了得到更佳的觀賞效果，各家顯示面板的廠商均致力於提升顯示面板的可視角度，因此廣視角顯示面板便孕育而生。 Nowadays, smart devices are becoming more and more inseparable from our lives. For example, the use of smart phones and tablets is becoming more and more popular. In order to obtain a better viewing effect, manufacturers of display panels are all working to improve the viewing angle of the display panel, so a wide viewing angle display panel is born.
在廣視角顯示面板中，其存在有共同電壓(Vcom)漂移的問題，這是由於用來控制顯示面板中的液晶層偏轉的電極上會有電荷累積所造成，而共同電壓的漂移會造成顯示面板在顯示畫面時產生無法預期的畫面閃爍(flicker)現象。一般來說，為了解決上述的問題，通常是利用顯示器關機時將累積於液晶層兩側電極上的電荷釋放，以改善共同電壓的漂移問題而避免顯示器有畫面閃爍的情形發生，但是此解決方式所釋放電荷的效果有限。 In the wide viewing angle display panel, there is a problem of a common voltage (Vcom) drift, which is caused by charge accumulation on the electrodes for controlling the deflection of the liquid crystal layer in the display panel, and the drift of the common voltage causes the display. The panel produces unpredictable flicker when the screen is displayed. In general, in order to solve the above problem, the charge accumulated on the electrodes on both sides of the liquid crystal layer is usually released when the display is turned off, so as to improve the drift of the common voltage and avoid the occurrence of flicker on the display, but this solution The effect of the released charge is limited.
本發明提供一種伽瑪電壓產生電路，其可於顯示器開機時改善共同電壓漂移的問題而避免顯示器有畫面閃爍的情形發生。 The present invention provides a gamma voltage generating circuit that can improve the problem of common voltage drift when the display is turned on to prevent the display from flickering.
本發明另提供一種適用於上述伽瑪電壓產生電路的伽瑪電壓產生方法。 The present invention further provides a gamma voltage generating method suitable for the above gamma voltage generating circuit.
本發明提出的一種伽瑪電壓產生電路，其適用於一種顯示面板，此種顯示面板用以顯示至少一個畫面，所述畫面包括一段空白期間以及一段顯示期間。所述伽瑪電壓產生電路包括一個第一電晶體、一個第二電晶體、多個第三電晶體、多個電阻以及一個開關單元。所述第一電晶體具有一個控制端、一個第一端以及一個第二端，所述第一電晶體之第一端電性連接於一個工作電壓。所述第二電晶體具有一個控制端、一個第一端以及一個第二端，所述第二電晶體之第二端電性連接於一個參考電壓。所述電阻串接於所述第一電晶體之第二端以及所述第二電晶體之第一端之間，每一個電阻與其相鄰之電阻之間藉由一個串接點而互相串接。每一個第三電晶體具有一個控制端、一個第一端以及一個第二端，所述第三電晶體之第一端電性連接於一個預設灰階電壓，所述預設灰階電壓之電壓值介於所述工作電壓以及所述參考電壓之間，而所述第三電晶體之第二端各自電性連接於對應之所述串接點。所述開關單元電性連接於所述第一電晶體之控制端、所述第二電晶體之控制端以及所述第三電晶體之控制端。所述開關單元用以接收一個控制訊號，並且依據所接收之控制訊號而於所述空白期間截止所述第一電晶體與所述第二電晶體，以及依據所接收之控制訊號而於所述空白期間導通所述第三電晶體。所述開關單元依據所接收之控制訊號而 於所述顯示期間導通所述第一電晶體與所述第二電晶體，並且依據所接收之控制訊號而於所述顯示期間截止所述第三電晶體。當所述第三電晶體被導通時，所述預設灰階電壓會被傳遞至所述串接點以藉由所述串接點而輸出所述預設灰階電壓。 The invention provides a gamma voltage generating circuit which is suitable for a display panel for displaying at least one picture, the picture comprising a blank period and a display period. The gamma voltage generating circuit includes a first transistor, a second transistor, a plurality of third transistors, a plurality of resistors, and a switching unit. The first transistor has a control end, a first end and a second end, and the first end of the first transistor is electrically connected to an operating voltage. The second transistor has a control end, a first end and a second end, and the second end of the second transistor is electrically connected to a reference voltage. The resistor is serially connected between the second end of the first transistor and the first end of the second transistor, and each resistor and its adjacent resistor are connected to each other by a series connection point . Each of the third transistors has a control end, a first end, and a second end, and the first end of the third transistor is electrically connected to a preset gray scale voltage, and the preset gray scale voltage is The voltage value is between the operating voltage and the reference voltage, and the second ends of the third transistor are each electrically connected to the corresponding series connection point. The switch unit is electrically connected to a control end of the first transistor, a control end of the second transistor, and a control end of the third transistor. The switching unit is configured to receive a control signal, and to turn off the first transistor and the second transistor during the blank according to the received control signal, and according to the received control signal, The third transistor is turned on during the blank period. The switch unit is based on the received control signal The first transistor and the second transistor are turned on during the display, and the third transistor is turned off during the display according to the received control signal. When the third transistor is turned on, the preset gray scale voltage is transmitted to the series junction to output the preset gray scale voltage by the series connection point.
本發明另提出的一種伽瑪電壓產生方法，其適用於一個顯示面板中之一個伽瑪電壓產生電路。所述顯示面板用以顯示至少一個畫面，所述畫面包括一個空白期間以及一個顯示期間。所述伽瑪電壓產生電路包括一個第一電晶體、一個第二電晶體、多個第三電晶體、多個電阻以及一個開關單元。所述第一電晶體接收一個工作電壓，所述第二電晶體接收一個參考電壓，所述電阻串接於所述第一電晶體以及所述第二電晶體之間並具有多個串接點，所述第三電晶體接收一個預設灰階電壓，所述開關單元電性連接於所述第一電晶體、所述第二電晶體以及所述第三電晶體並決定是否導通所述第三電晶體以將所述灰階電壓藉由所述第三電晶體輸出至所述串接點。所述伽瑪電壓產生方法包括下列步驟：提供控制訊號至所述開關單元。其中，所述開關單元於所述空白期間依據所述控制訊號而截止所述第一電晶體以及所述第二電晶體，所述開關單元於所述空白期間依據所述控制訊號而導通所述第三電晶體。其中，所述開關單元於所述顯示期間依據所述控制訊號而導通所述第一電晶體以及所述第二電晶體，所述開關單元於所述顯示期間依據所述控制訊號而截止所述第三電晶體。 Another method for generating a gamma voltage according to the present invention is applicable to a gamma voltage generating circuit in a display panel. The display panel is configured to display at least one picture, the picture includes a blank period and a display period. The gamma voltage generating circuit includes a first transistor, a second transistor, a plurality of third transistors, a plurality of resistors, and a switching unit. The first transistor receives an operating voltage, the second transistor receives a reference voltage, and the resistor is connected in series between the first transistor and the second transistor and has a plurality of series contacts The third transistor receives a preset gray scale voltage, and the switch unit is electrically connected to the first transistor, the second transistor, and the third transistor and determines whether to turn on the first a tri-electrode to output the gray scale voltage to the series junction by the third transistor. The gamma voltage generating method includes the steps of providing a control signal to the switching unit. The switch unit turns off the first transistor and the second transistor according to the control signal during the blank period, and the switch unit turns on the control signal according to the control signal during the blank period The third transistor. The switch unit turns on the first transistor and the second transistor according to the control signal during the display period, and the switch unit cuts off according to the control signal during the display period. The third transistor.
本發明因為是在顯示面板顯示畫面的空白期間內使開關單元依據控制訊號截止第一電晶體以及第二電晶 體，並在同一個空白期間內使開關單元依據控制訊號導通多個第三電晶體，以使第三電晶體將所接收之預設灰階電壓藉由多個電阻之間的串接點而輸出，因此可以在顯示面板仍然在運作的期間內改善漂移的共同電壓而達成避免顯示畫面閃爍的目的。 The invention causes the switching unit to cut off the first transistor and the second transistor according to the control signal during the blank period of the display screen of the display panel. And driving the switch unit to turn on the plurality of third transistors according to the control signal during the same blank period, so that the third transistor receives the preset gray scale voltage by a series connection point between the plurality of resistors The output can be used to avoid the flicker of the display screen by improving the common voltage of the drift while the display panel is still operating.
11、12、13‧‧‧電晶體 11, 12, 13‧‧‧ transistors
11-1、12-1、13-1‧‧‧第一端 11-1, 12-1, 13-1‧‧‧ first end
11-2、12-2、13-2‧‧‧第二端 11-2, 12-2, 13-2‧‧‧ second end
11-3、12-3、13-3‧‧‧控制端 11-3, 12-3, 13-3‧‧‧ control end
14‧‧‧電阻 14‧‧‧resistance
15‧‧‧開關單元 15‧‧‧Switch unit
AVDD‧‧‧工作電壓 AVDD‧‧‧ working voltage
GND‧‧‧參考電壓 GND‧‧‧reference voltage
S‧‧‧串接點 S‧‧‧Splicing point
HAOP‧‧‧預設灰階電壓 HAOP‧‧‧Preset grayscale voltage
VBK‧‧‧控制訊號 V BK ‧‧‧ control signal
DS‧‧‧資料訊號 DS‧‧‧Information Signal
B、B1、B2、B3、B4‧‧‧空白期間 B, B1, B2, B3, B4‧‧‧ blank period
A、A1、A2、A3、A4‧‧‧顯示期間 A, A1, A2, A3, A4‧‧‧ display period
F、F1、F2、F3、F4‧‧‧畫面 F, F1, F2, F3, F4‧‧‧ screen
501‧‧‧步驟 501‧‧‧Steps
圖1為本發明一實施例之伽瑪電壓產生電路的電路圖；圖2為本發明一實施例之伽瑪電壓產生電路的時序圖；圖3為本發明又一實施例之伽瑪電壓產生電路的時序圖；圖4為本發明再一實施例之伽瑪電壓產生電路的時序圖；圖5為本發明一實施例之伽瑪電壓產生電路產生伽瑪電壓的流程圖。 1 is a circuit diagram of a gamma voltage generating circuit according to an embodiment of the present invention; FIG. 2 is a timing diagram of a gamma voltage generating circuit according to an embodiment of the present invention; and FIG. 3 is a gamma voltage generating circuit according to still another embodiment of the present invention. FIG. 4 is a timing chart of a gamma voltage generating circuit according to still another embodiment of the present invention; and FIG. 5 is a flow chart of generating a gamma voltage by a gamma voltage generating circuit according to an embodiment of the present invention.
圖1為本發明一實施例之伽瑪電壓產生電路的電路圖。如圖1所示，伽瑪電壓產生電路100包括電晶體11、電晶體12、多個互相串聯的電晶體13、多個互相串聯的電阻14以及開關單元15。電晶體11具有第一端11-1、第二端11-2以及控制端11-3。電晶體11之第一端11-1電性連接於工作電壓AVDD。電晶體12具有第一端12-1、第二端12-2以及控制端12-3。電晶體12之第二端12-2電性連接於參考電壓GND。在本實施例中，參考電壓GND例如是接地，但並不以此為限。電阻14串接於電晶體11之第二端11-2以及電晶體12之第一端12-1之間，每一個電阻14與其相鄰之電阻 14之間藉由串接點S而互相串接。在本實施例中，工作電壓AVDD以及參考電壓GND之間的電壓差藉由串接的電阻14進行分壓而使各個串接點S可以輸出不同的伽瑪電壓。每一個電晶體13具有第一端13-1、第二端13-2以及控制端13-3。電晶體13之第一端13-1電性連接於預設灰階電壓HAOP，預設灰階電壓HAOP之電壓值介於工作電壓AVDD以及參考電壓GND之間，而電晶體13之第二端13-2各自電性連接於對應之串接點S。在本實施例中，電晶體13的數量等同於電阻14的數量，而預設灰階電壓HAOP之電壓值等同於工作電壓AVDD以及參考電壓GND之平均值，但並不以此為限。開關單元15電性連接於電晶體11之控制端11-3、電晶體12之控制端12-3以及電晶體13之控制端13-3。除此之外，圖1所示之伽瑪電壓產生電路100適用於一種顯示面板(圖未示)，此種顯示面板用以顯示至少一個畫面，此畫面包括一段空白期間以及一段顯示期間。 1 is a circuit diagram of a gamma voltage generating circuit according to an embodiment of the present invention. As shown in FIG. 1, the gamma voltage generating circuit 100 includes a transistor 11, a transistor 12, a plurality of transistors 13 connected in series, a plurality of resistors 14 connected in series, and a switching unit 15. The transistor 11 has a first end 11-1, a second end 11-2, and a control end 11-3. The first end 11-1 of the transistor 11 is electrically connected to the operating voltage AVDD. The transistor 12 has a first end 12-1, a second end 12-2, and a control end 12-3. The second end 12-2 of the transistor 12 is electrically connected to the reference voltage GND. In the embodiment, the reference voltage GND is grounded, for example, but is not limited thereto. The resistor 14 is connected in series between the second end 11-2 of the transistor 11 and the first end 12-1 of the transistor 12, and each resistor 14 is adjacent to the resistor 14 is connected in series with each other by a series connection point S. In the present embodiment, the voltage difference between the operating voltage AVDD and the reference voltage GND is divided by the series connected resistors 14 so that the respective series contacts S can output different gamma voltages. Each of the transistors 13 has a first end 13-1, a second end 13-2, and a control end 13-3. The first end 13-1 of the transistor 13 is electrically connected to the preset gray scale voltage HAOP, and the voltage value of the preset gray scale voltage HAOP is between the working voltage AVDD and the reference voltage GND, and the second end of the transistor 13 13-2 are each electrically connected to the corresponding series connection point S. In the present embodiment, the number of the transistors 13 is equal to the number of the resistors 14, and the voltage value of the preset gray-scale voltage HAOP is equal to the average of the operating voltage AVDD and the reference voltage GND, but is not limited thereto. The switch unit 15 is electrically connected to the control terminal 11-3 of the transistor 11, the control terminal 12-3 of the transistor 12, and the control terminal 13-3 of the transistor 13. In addition, the gamma voltage generating circuit 100 shown in FIG. 1 is applicable to a display panel (not shown) for displaying at least one picture including a blank period and a display period.
圖2為本發明一實施例之伽瑪電壓產生電路的時序圖。如圖2所示，資料訊號DS表示顯示面板(圖未示)顯示一個畫面，也就是一幀(frame)時提供至顯示面板之資料線(圖未示)的訊號。上述的一個畫面，也就是資料訊號DS的一個週期，在這一個週期當中包括了空白期間B以及顯示期間A。特別一提的是，當顯示面板顯示一個畫面的空白期間B時，資料線所接收到的是低準位的資料訊號DS，此時串接點S實質上不輸出伽瑪電壓，而當顯示面板顯示一個畫面的顯示期間A時，資料線所接收到的是高準位的資料訊號DS，此時串接點S輸出伽瑪電壓以使顯示面板顯示特定的灰階畫面。 2 is a timing diagram of a gamma voltage generating circuit according to an embodiment of the present invention. As shown in FIG. 2, the data signal DS indicates that the display panel (not shown) displays a picture, that is, a signal provided to the data line (not shown) of the display panel when a frame is used. The above one picture, that is, one cycle of the data signal DS, includes a blank period B and a display period A in this one cycle. In particular, when the display panel displays a blank period B of a picture, the data line receives a low-level data signal DS, and the serial connection point S does not substantially output the gamma voltage, but when displayed When the panel displays the display period A of one screen, the data line receives the high-level data signal DS. At this time, the serial connection point S outputs a gamma voltage to cause the display panel to display a specific grayscale image.
請共同參照圖1以及圖2，開關單元15用以接收控制訊號VBK，並且依據所接收之控制訊號VBK而於空白期間B截止電晶體11與電晶體12，以及依據所接收之控制訊號VBK而於空白期間B導通電晶體13。開關單元15還依據所接收之控制訊號VBK而於顯示期間A導通電晶體11與電晶體12，並且依據所接收之控制訊號VBK而於顯示期間A截止電晶體13。當電晶體13被導通時，預設灰階電壓HAOP會被傳遞至串接點S以藉由串接點S而輸出預設灰階電壓HAOP。詳細而言，伽瑪電壓產生電路100中的電晶體11以及電晶體12於顯示面板顯示一個畫面的空白期間B被開關單元15依據高準位之控制訊號VBK而截止，因此工作電壓AVDD以及參考電壓GND之間沒有導通的路徑，而此時開關系統15還依據高準位之控制訊號VBK而導通電晶體13，因此預設灰階電壓HAOP便會藉由電晶體13而被輸出至對應的串接點S。透過上述操作，可以使伽瑪電壓產生電路100中的每一個串接點S皆於顯示面板顯示一畫面的空白期間B輸出預設灰階電壓HAOP，讓全畫面在空白期間成為輕載畫面，可加速釋放液晶內殘留的電荷，藉此改善顯示面板的畫面殘留以及畫面閃爍問題。 Referring to FIG. 1 and FIG. 2 together, the switch unit 15 is configured to receive the control signal V BK and turn off the transistor 11 and the transistor 12 during the blank period B according to the received control signal V BK , and according to the received control signal V BK is used to conduct the crystal 13 during the blank period B. The switch unit 15 also conducts the transistor 11 and the transistor 12 during the display period A according to the received control signal V BK , and turns off the transistor 13 during the display period A according to the received control signal V BK . When the transistor 13 is turned on, the preset gray scale voltage HAOP is transmitted to the series junction S to output the preset gray scale voltage HAOP by the series connection point S. In detail, the transistor 11 and the transistor 12 in the gamma voltage generating circuit 100 are turned off by the switching unit 15 according to the high-level control signal V BK when the display panel displays a blank period B of a picture, and thus the operating voltage AVDD and There is no conduction path between the reference voltage GND, and the switching system 15 also conducts the crystal 13 according to the high level control signal V BK , so the preset gray scale voltage HAOP is output to the transistor 13 Corresponding tandem point S. Through the above operation, each of the series connection points S in the gamma voltage generating circuit 100 can output the preset gray level voltage HAOP in the blank period B of the display panel displaying a picture, so that the full picture becomes a light load picture during the blank period. The charge remaining in the liquid crystal can be accelerated, thereby improving the image sticking of the display panel and the problem of flickering of the screen.
圖3為本發明又一實施例之伽瑪電壓產生電路的時序圖。圖3與圖2之中相同的標號表示相同的元件或訊號。如圖3所示，當顯示面板顯示多個畫面F1~F4時，例如F1表示為第一個畫面，F2表示為第二個畫面，F3表示為第三個畫面，F4則表示為第四個畫面，開關單元15依據所接收之控制訊號VBK而於每一個空白期間B1~B4截止電晶體11與電晶體12，以及依據所接收之控制訊號VBK而於每一個空 白期間B1~B4導通電晶體13，以便伽瑪電壓產生電路100於顯示面板之空白期間B1~B4藉由每一個串接點輸出預設灰階電壓HAOP。開關單元15還依據所接收之控制訊號VBK而於每一個顯示期間A1~A4導通電晶體11與電晶體12，以及依據所接收之控制訊號VBK而於每一個顯示期間A1~A4截止電晶體13，以便伽瑪電壓產生電路100於顯示面板之每一個顯示期間A1~A4輸出顯示畫面所需的伽瑪電壓。 3 is a timing chart of a gamma voltage generating circuit according to still another embodiment of the present invention. The same reference numerals in Fig. 3 and Fig. 2 denote the same elements or signals. As shown in FIG. 3, when the display panel displays a plurality of screens F1 to F4, for example, F1 is represented as the first screen, F2 is represented as the second screen, F3 is represented as the third screen, and F4 is represented as the fourth screen. control signal V BK received the received the picture, the switching unit 15 according to the control signal V BK and B1 ~ B4 oFF transistor 11 and the transistors in each blank period 12, and based on the in each blank period B1 ~ B4 guide The crystal 13 is energized so that the gamma voltage generating circuit 100 outputs the preset gray scale voltage HAOP by each of the series contacts during the blank period B1 to B4 of the display panel. The switch unit 15 is also based on the control signal V BK received of the control signal V BK received the period of each display A1 ~ A4-on crystals 11 and transistor 12, and a basis and during each display A1 ~ A4 cut-off The crystal 13 is such that the gamma voltage generating circuit 100 outputs the gamma voltage required for displaying the picture during each of the display periods A1 to A4 of the display panel.
圖4為本發明再一實施例之伽瑪電壓產生電路的時序圖。圖4與圖2之中相同的標號表示相同的元件或訊號。如圖4所示，當顯示面板顯示多個畫面時，開關單元15依據所接收之控制訊號VBK而於所述不相鄰畫面之至少一個空白期間B1~B4截止電晶體11與電晶體12，以及依據所接收之控制訊號VBK而於所述不相鄰畫面之至少一個空白期間B1~B4導通電晶體13，以便伽瑪電壓產生電路100於顯示面板之至少一個空白期間B1~B4藉由每一個串接點S輸出預設灰階電壓HAOP。在本實施例中，開關單元15例如是依據所接收之控制訊號VBK而於第一個畫面F1以及第三個畫面F3的空白期間B1、B3截止電晶體11與電晶體12以及導通電晶體13，以便伽瑪電壓產生電路100於顯示面板顯示第一個畫面F1以及第三個畫面F3之空白期間B1、B3藉由對應的串接點S輸出預設灰階電壓HAOP。開關單元15依據所接收之控制訊號VBK而於每一個顯示期間A1~A4導通電晶體11與電晶體12，以及依據所接收之控制訊號VBK而於每一個顯示期間A1~A4截止電晶體13，以便伽瑪電壓產生電路100於顯示面板之每一個顯示期間A1~A4藉由對應的串接點S輸出顯示畫面所需的伽瑪電壓。 4 is a timing chart of a gamma voltage generating circuit according to still another embodiment of the present invention. The same reference numerals in Fig. 4 and Fig. 2 denote the same elements or signals. As shown in FIG. 4, when the display panel displays a plurality of screens, the switch unit 15 turns off the transistor 11 and the transistor 12 in at least one blank period B1 to B4 of the non-adjacent screen according to the received control signal V BK . And conducting the crystal 13 in at least one blank period B1~B4 of the non-adjacent picture according to the received control signal V BK , so that the gamma voltage generating circuit 100 borrows from at least one blank period B1 B B4 of the display panel The preset gray scale voltage HAOP is outputted by each of the series contacts S. In this embodiment, the switching unit 15 cuts off the transistor 11 and the transistor 12 and the conducting current crystal, for example, according to the received control signal V BK in the blank periods B1 and B3 of the first picture F1 and the third picture F3. 13. The gamma voltage generating circuit 100 outputs the preset gray scale voltage HAOP by the corresponding series connection point S when the display panel displays the first screen F1 and the blank period B1 and B3 of the third screen F3. The reception of the switch unit 15 according to the control signal V BK and during each display received the A1 ~ A4-on crystals 11 and transistor 12, and according to the control signal V BK and in every display period A1 ~ A4 off transistor 13. The gamma voltage generating circuit 100 outputs the gamma voltage required for displaying the picture by the corresponding series connection point S during each of the display periods A1 to A4 of the display panel.
特別一提的是，在本發明中所提及的控制訊號VBK的持續時間係等同於空白期間B的持續時間，然而本發明並不以此為限，控制訊號VBK的持續時間可視需求而調整，但不超過空白期間B的持續時間。 In particular, the duration of the control signal V BK mentioned in the present invention is equivalent to the duration of the blank period B. However, the present invention is not limited thereto, and the duration of the control signal V BK can be visually required. While adjusting, but not exceeding the duration of the blank period B.
圖5為本發明一實施例之伽瑪電壓產生電路產生伽瑪電壓的流程圖。如圖5所示，上述由伽瑪電壓產生電路100產生伽瑪電壓，也就是輸出預設灰階電壓HAOP的方式可以歸納出一個主要的步驟501：提供控制訊號至開關單元。由於提供控制訊號的時機以及開關單元接收控制訊號後的操作已經在前文有所敘述，因此不再贅述。 FIG. 5 is a flow chart of generating a gamma voltage by a gamma voltage generating circuit according to an embodiment of the present invention. As shown in FIG. 5, the above-described manner of generating the gamma voltage by the gamma voltage generating circuit 100, that is, outputting the preset gray scale voltage HAOP, can be summarized into a main step 501: providing a control signal to the switching unit. Since the timing of providing the control signal and the operation after the switching unit receives the control signal have been described above, they will not be described again.
綜上所述，本發明之伽瑪電壓產生電路100採用了電晶體11、電晶體12、多個電晶體13、多個電阻14以及開關單元15，並藉由開關單元15接收控制訊號以在顯示畫面之空白期間B截止電晶體11以及電晶體12，以在此期間內停止輸出正常伽瑪電壓，並在此期間內導通電晶體13以藉由電晶體13將預設灰階電壓HAOP傳遞至對應的串接點S而使伽瑪電壓產生電路100輸出預設灰階電壓HAOP，如此一來便可以讓全畫面在空白期間成為輕載畫面，可加速釋放液晶內殘留的電荷，以避免顯示畫面發生閃爍的情況。 In summary, the gamma voltage generating circuit 100 of the present invention employs a transistor 11, a transistor 12, a plurality of transistors 13, a plurality of resistors 14, and a switching unit 15, and receives control signals by the switching unit 15 to During the blank period of the display screen, the transistor 11 and the transistor 12 are turned off to stop outputting the normal gamma voltage during this period, and during this period, the current-carrying crystal 13 is passed to pass the preset gray-scale voltage HAOP by the transistor 13. The gamma voltage generating circuit 100 outputs the preset gray scale voltage HAOP to the corresponding series connection point S, so that the full picture becomes a light load picture during the blank period, and the residual charge in the liquid crystal can be accelerated to avoid The display screen flickers.
雖然本發明已以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內，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。 While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.
11、12、13‧‧‧電晶體 11, 12, 13‧‧‧ transistors
11-1、12-1、13-1‧‧‧第一端 11-1, 12-1, 13-1‧‧‧ first end
11-2、12-2、13-2‧‧‧第二端 11-2, 12-2, 13-2‧‧‧ second end
11-3、12-3、13-3‧‧‧控制端 11-3, 12-3, 13-3‧‧‧ control end
14‧‧‧電阻 14‧‧‧resistance
15‧‧‧開關單元 15‧‧‧Switch unit
AVDD‧‧‧工作電壓 AVDD‧‧‧ working voltage
GND‧‧‧參考電壓 GND‧‧‧reference voltage
S‧‧‧串接點 S‧‧‧Splicing point
HAOP‧‧‧預設灰階電壓 HAOP‧‧‧Preset grayscale voltage
VBK‧‧‧控制訊號 V BK ‧‧‧ control signal
Claims (8)
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| TW104100448A TWI527020B (en) | 2015-01-07 | 2015-01-07 | Circuit and method for generating gamma voltage |
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| CN106409256B (en) * | 2016-11-03 | 2019-04-05 | 昆山龙腾光电有限公司 | A kind of gamma voltage generation circuit and liquid crystal display device |
| CN107369427A (en) * | 2017-09-21 | 2017-11-21 | 昆山龙腾光电有限公司 | A kind of gamma voltage generation circuit and liquid crystal display device |
| CN108682403B (en) * | 2018-04-28 | 2020-08-04 | 昆山龙腾光电股份有限公司 | Gamma voltage switching device and liquid crystal display device |
| US11373607B2 (en) * | 2020-03-16 | 2022-06-28 | Novatek Microelectronics Corp. | Display device and driving method thereof for reducing flicker due to refresh rate variation |
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| KR20030073390A (en) * | 2002-03-11 | 2003-09-19 | 삼성전자주식회사 | A liquid crystal display for improving dynamic contrast and a method for generating gamma voltages for the liquid crystal display |
| CN101311782B (en) * | 2007-05-25 | 2011-07-20 | 奇美电子股份有限公司 | Gray scale voltage generation circuit and its operation method |
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