經濟部中央標準局員工消費合作社印袈 3^176〇 A7 ______ B7 五、發明説明（1 ) 本發明係有關於一種液晶顯示驅動器之偏壓電位產 生方法及其裝置，特別有關於一種平時可減少漏電流^而 又通動態供應液晶顯示波形切換時所需之瞬間電流的液 晶顯示驅動器之偏壓電位產生方法及其裝置。 —般液晶顯示器（Liquid Crystal Display ;簡稱 LCD) 之用途極廣，例如電子錶、掌上型電玩等需顯示畫面之裝 置’而其習知之內部構造，則大部分如圖1所示。 該圖1之構造包括一液晶顯示驅動器1 〇，該液晶顯 示—器利甩二—具電阻R之電位分壓器20_來對一外部電源Vcc 分壓’並依據所得之偏壓電位(bias levels)Va.〜JVe來驅動 液.晶顯-示驅動器10，如此，gtllL使該液晶顯示%動器10 輸里類比之液晶顯不波形（LCD waveform)予一液晶顯示面 板 30(LCD panel)，其包括共用j信號（common signals)COMl 〜COM8 及段信號（segment signals)SEGl 〜SEG40。 由於液晶顯示驅動器之偏壓電位Va〜Ve係透過電位 分壓器2〇之複數個電阻R分壓產生，所以會構成一個直流 路徑(DC path)，而爲了減少經過該路徑之直流電流Id，大 多採用高阻値之電阻，例如100ΑΩ或200ΛΩ，不過，如此 一來，在液晶顯示波形切換時，動態堆_靈流供應即又顯得 五足I因此，習知作法是在处部増設重容C，透過晶片1 之輸出入墊（I/O Pad)5而與該電泣分壓器20連接，甚遲由 電容C的穩壓作用，以提供液晶顯示波形切換時所須的瞬 間電流It。 以上述習知架構來產生偏壓電位的晶片係如οκι半 3 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） ---------C, 丫 裝— (請先閱讀背面之注意事項再填寫本頁) 訂 32!7β〇 經濟部中央標準扃員工消费合作社印製 A7 B7 .... - I 五、發明説明（2 ) 導體公司的LC.產品系列，其編號爲MSM5238GS ' MSM5259GS、或MSM5278GS等。但不可避免的，該架構 具有下列缺失： 1.對於低價位的LCD掌上型電玩而言，外加電容會增 加材料成本’而爲配合該電容珩震跑_輸出入墊ϋι會使組裝 &本上升。 2·因外加電容_增設猶出入墊，使該墊里f無法減 少，導致積體器晶片之空間無法以先進的製程_降低。· 至於目前解決上述缺失之習知方法有二： 容，降低該分壓電阻R之電阻値，以提供較 大的電流，但如此會產生一大的漏電流，例如’原電位分 壓器20之電阻R爲1〇〇泊，電壓源Vcc爲5V，則經此直 流路徑之原直流電流Id=5V/(100AQX 5)=10/t4，若將電阻 R降爲15松，則原直流路徑將形成一較大電流Id=5v/(15AQ X 5)=67W，由於這樣的漏電流並不用在晶片的操作上’ 因此徒增浪費。 2·在.晶片a部1¾-建霞容，不過，其困口晶 片面積’且與所需的《容量仍相差好幾個鐵數(order)。 有鑑於此，本發明之一目的爲利用一種液晶顯示驅動 器之偏壓電位產生裝置，其毋須外加電容即可動態供應二液 晶顯示驅動波形切換時所需之瞬間電流。 本發明之另一目的爲，利用=種液晶顯示驅動器之偏 壓電位產生方法，其藉由在平時由高阻値之電阻減少漏電 流，而又能動態地在液晶顯示驅動波形切換時，藉由並聯 4 本紙張尺度適用中國國家標準（CNS ) A4規格（210X 297公釐）. (請先閲讀背面之注意事項再填寫本頁) ~r裝. 訂Seal of the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs 3 ^ 176〇A7 ______ B7 5. Description of the invention (1) The present invention relates to a method and device for generating a bias potential of a liquid crystal display driver, in particular to a normal A method and device for generating a bias voltage potential of a liquid crystal display driver that reduces leakage current and dynamically supplies the instantaneous current required when the liquid crystal display waveform is switched. The general use of Liquid Crystal Display (LCD) is extremely versatile, such as electronic watches, handheld video games and other devices that require display screens. The conventional internal structure is mostly shown in Figure 1. The structure of FIG. 1 includes a liquid crystal display driver 10. The liquid crystal display device has a potential divider 20_ with a resistor R to divide an external power supply Vcc and according to the obtained bias voltage ( bias levels) Va. ~ JVe to drive the liquid crystal display-display driver 10, so, gtllL makes the LCD display 10% of the liquid crystal display analog output LCD waveform (LCD waveform) to a liquid crystal display panel 30 (LCD panel ), Which includes common j signals (common signals) COMl to COM8 and segment signals (segment signals) SEGl to SEG40. Since the bias potentials Va ~ Ve of the liquid crystal display driver are generated by dividing a plurality of resistors R of the potential divider 20, a DC path is formed, and in order to reduce the DC current Id passing through the path Most of them use high-resistance resistors, such as 100 Ω or 200 Ω. However, in this way, when the LCD display waveform is switched, the dynamic stack_spirit supply appears to be five-legged again. Therefore, the conventional method is to set up a heavy reset everywhere. Capacitor C is connected to the voltage divider 20 through the I / O pad 5 of the chip 1, and the voltage stabilizing effect of the capacitor C is provided later to provide the instantaneous current required for the switching of the liquid crystal display waveform It. The chip used to generate the bias potential with the above-mentioned conventional architecture is as follows. The size of this paper is applicable to the Chinese National Standard (CNS) A4 specification (210X297mm) --------- C, YA installed— ( Please read the precautions on the back and then fill out this page) Order 32! 7β〇 A7 B7 printed by the Central Standards Employee Consumer Cooperative of the Ministry of Economy ....-I 5. Description of the invention (2) LC. Product series of the conductor company, Its number is MSM5238GS 'MSM5259GS, or MSM5278GS, etc. But inevitably, the architecture has the following defects: 1. For low-cost LCD handheld video games, the addition of capacitors will increase the material cost, and in order to cooperate with the capacitors, the output will be assembled & Ben rose. 2. Due to the added capacitor_addition of the in and out pads, the f in the pad cannot be reduced, resulting in the space of the integrated device chip cannot be reduced by advanced processes_. · As for the current conventional methods to solve the above-mentioned defects, there are two methods: to reduce the resistance value of the voltage-dividing resistor R to provide a larger current, but this will cause a large leakage current, such as' primary potential divider 20 The resistance R is 100 poise, and the voltage source Vcc is 5V, then the original DC current Id = 5V / (100AQX 5) = 10 / t4 through this DC path, if the resistance R is reduced to 15 loose, then the original DC path A larger current Id = 5v / (15AQ X 5) = 67W will be formed, because such leakage current is not used in the operation of the wafer ', so it is wasted. 2. In the wafer a part 1¾-Jian Xia Rong, however, its trapped wafer area 'is still a few iron orders away from the required capacity. In view of this, one object of the present invention is to use a bias potential generating device of a liquid crystal display driver, which can dynamically supply the instantaneous current required when the driving waveform of the two-liquid crystal display is switched without the need for an external capacitor. Another object of the present invention is to use a method for generating a bias potential of a liquid crystal display driver, which reduces the leakage current by a high-resistance resistance at ordinary times, and can dynamically change when the liquid crystal display driving waveform is switched. By paralleling 4 paper standards, the Chinese National Standard (CNS) A4 specification (210X 297mm) is applicable. (Please read the precautions on the back before filling this page) ~ r. Order
經濟部中央標準局員工消費合作社印製 五、發明説明（3 ) 一低阻値之電阻’以提供足夠粗騰流，減少該波形的 尖峰信號（spike)。 本發明的特徵之一爲’該液晶顯示驅動器之偏壓電位 產生裝置具有一與電位分壓器之分壓電阻並聯的低電 阻，用以動態地提供較大的電流。 本發明的特徵之二爲，藉由二切換裝;置來決定上逃低 雷阴駔分壓雷阴.釣，聯—與否〇 本明进名三爲，利用一信號產生裝置來產生液 '晶顯示切換信號，以在液晶顯示波形旬換時，動態地控制 切換裝置之開關，並依此使低電阻與分壓電阻迹聯，進而 產生較大的瞬間電流。 爲達成上述目的，本發明之一種液晶顯示驅動器之偏 壓電位產生裝置，其包括： 一電位分壓器，由複數個分壓電阻串聯而成，且藉該 分壓電阻形成一具複數個節點之直流路徑，並依據該節點 之偏壓電位，使上述液晶顯示驅動器輸出複數個液晶顯示 波形； 一信號產生裝置，用以輸出與上述液晶顯示波形進行 切換時的同步切換信號；及 一切換裝置，具有複數個與上述分壓電阻並聯的切換 單元’該切換單元可依據上述信號產生裝置之切換信號 値’而於該液晶顯示波形進行切換時，形成一與該分壓電 阻並聯的第二電阻，且於其餘時間形成斷路。 其中，上述切換裝置亦可爲複數值具內阻之切換單 5 本紙張尺度適用中國國家標準（CNS ) M規格（2丨0 X 297公釐_) "~~ --------{^~r裝------訂-----(k - (請先閱讀背面之注意事項再填寫本頁) 經濟部中央標準局貞工消費合作社印製 啦760 A7 B7 五、發明説明（4 ) 元，其與上述各分壓電阻並聯，該閫可依據上述信號產 生裝置之切換像號値，而_於_藍蓝_晶_氣示」波形.進行切換時萼 通，使該1¾服與分壓屬組並聯，且於呈餘脖胤不導麗丄形 成斷路。 而本發明之另一種液晶顯示驅動器之偏壓電位產生 裝置，其包括： 一電位分壓器，由複數組分壓電阻串聯而成，並藉該 分壓電阻激成一1具複數個節點之直流路徑，且每一組分壓 ’霉阻均含一第一電阻及一與之串聯的第二電阻，可用以依 據該節點之偏壓電位，使上述液晶顯示驅動器輸出複數個 液晶顯示波形； 一if號產生裝置，用以輸出與上述液晶顯示波形進行 切換時的同步切換信號；及 一切換裝置，具有複數個與上述第二電阻並聯的切換 單元，該切換單元可依據上述信號產生裝置之切換信號 値，而於該液晶顯示波形進行切換時導通，形成短路，且 於其餘時間不導通，形成斷路。 此外，本發明之第一種液晶顯示驅動器之偏壓電位產 生方法，其包括下列步驟： (a) 利用一由複數個分壓電阻串聯而成的電位分壓 器，以藉該分壓電阻形成一具複數個節點之直流路徑； (b) 依據該節點之偏壓電位，以使上述液晶顯示驅動器 輸出複數個液晶顯示波形； (c) 利用一信號產生裝置，以輸出與上述液晶顯示波形 6 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐）. --------------IT-----r'.^ (請先閱讀背面之注意事項再填寫本頁) 經濟部中央標準局員工消費合作社印製 A7 B7 五、發明説明（5 ) 進行切換時的同步切換信號；及 (d)利用一具有複數個切換單元之切換裝置，使該切換 單元與上述分壓電阻並聯，且使該切換單元依據上述信號 產生裝置之切換信號値，而於該液晶顯示波形進行切換 時，形成一與該分壓電阻並聯的第二電阻，且於其餘時間 形成斷路。 本發明之第二種液晶顯示驅動器之偏壓電位產生方 法，其包括下列步驟= (a) 利用一由複數個分壓電阻串聯而成的電位分壓 器，以藉該分壓電阻形成一具複數個節點之直跑路徑； (b) 依據該節點之偏壓電位，以使上述液晶顯示驅動器 輸出複數個液晶顯示波形； (c) 利用一信號產生裝置，以輸出與上述液晶顯示波形 進行切換的同步切寶信號；及 (d) 利用一具有複數個含內阻之切換單元的切換裝 置，使該切換單元與上述分壓電阻並聯，且使該切換'單元 依據上述信號產生裝置之切換信號値，而於該液晶顯示波 形進行切換時導通，使該內阻與分壓電阻並聯，且於其餘 時間不導通，形成斷路。 本發明之第三種液晶顯示驅動電位產生方法，其包括 下列步驟： (a)利用一由複數組分壓電阻串聯而成的電位分壓 器，以藉該分壓電阻形成一具複數個節點之直流路徑，且 每一組分壓電阻均含一第一電阻及一與之串聯的第二電 7 --------^ ί衣------訂-----c.r (請先閱讀背面之注意事項再填寫本頁) 本紙張尺度適用中國國家標準（CNS ) A4規格（2I0X297公釐） 3 1760 A7 B7 五、發明説明（6 ) 阻； (b) 依據該節點之偏壓電位產生液晶顯不驅動電位，以 使上述液晶顯示驅動器輸出複數個液晶顯示波形； (c) 利用一信號產生裝置，以輸出與上述液晶顯示波形 進行切換時的同步切換信號；及 (d) 利用一具有複數個切換單元之切換裝置，使該切換 單元與上述第二電阻並聯，且使該切換單元可依據上述信 號產生裝置之切換信號値，而於該液晶顯示波形進行切換 時導通，形成短路，且於其餘時間不導通，形成斷路。 爲讓本發明之上述和其他目的、特徵、和優點能更明 顯易懂，下文特舉一較佳實施例，並配合所附圖式，作詳 細說明如下： 圖式之簡單說明： 第1圖係顯示習知液晶顯示驅動器之偏壓電位產生 裝置之結構圖； 第2圖係顯示本發明液晶顯示驅動器之偏壓電位產 生裝置之方塊圖； 第3圖係顯示本發明液晶顯示驅動器之偏壓電產生 裝置之第一實施例； 第4A圖係顯示本發明液晶顯示驅動器之偏壓電位產 生裝置之第二實施例； 第4B圖係顯示第4A圖中，部分切換裝置53之一實 施例； 第4C圖係顯示第4B圖之等效電路圖； 8 (請先閲讀背面之注意事項再填寫本頁) \1--- . 、、i Λ ---^ )-裝------訂-----iv線 經濟部中央標準局員工消費合作社印装 本纸張尺度適用中國國家標準（CNS ) A4規格（2丨Ο X 297公釐） A7 五、發明説明（7) 第5圖係顯示本發明液晶顯示驅動器之偏壓電位產 生裝置之第三實施例； 第6圖係顯示液晶顯示波形切換之脈波時序圖； 第7圖係顯示典型的液晶顯示波形； 第8A圖係顯示一液晶顯示驅動器在一無負載下輸出 的液晶顯示波形； 第8B圖係顯示一液晶顯示驅動器在電位分壓器之分 壓電阻爲100ΑΩ時輸出的液晶顯示波形； 第8C圖係顯示一液晶顯示驅動器在電位分壓器之分 壓電阻爲50泊時輸出的液晶顯示波形； 一 第8D圖係顯示一液晶顯示驅動器在電位分壓器之分 壓電阻爲25松時輸出的液晶顯示波形。 請參閱第2圖，係顯示本發明液晶顯示驅動器之偏壓 電位產生裝置之方塊圖，該液晶顯示驅動器之偏壓電位產 生裝置50與一·液晶顯示驅動器40連接，該液晶顯示驅動 器40則接收~~來自信號產生裝置55之時脈信號CLK。 經濟部中央標準局貝工消费合作社印製 (請先閱讀背面之注意事項再填寫本頁) 該液晶顯示驅動電位產生裝置50包括一電位分壓器 51 ’其藉一電壓源V予以分壓，並產生一偏壓電位以驅動 該液晶顯示驅動器40，並使其依據接收之時脈信號CLK. 來輸出液晶顯示波形予一液晶顯示面板30 ,其包括複數個 共用信號 COM(Common Signals)及段信號 SEG(Segment Signals) ° 其中，信號產生裝置55 ，可用以依據系統時鐘 sysck(system clock)，輸出與上述液晶顯示波形(COM及 9 本紙張尺度適用中國國家標準（CNS ) A4規格（210父297公釐1 A7 B7 五、發明説明（8 ) SEG)進行切換時的同步切換信號LCDPULSE及時脈信號 CLK。 —切換裝置53，其與上述電位分壓器51連接，用以 依據上述信號產生裝置之切換信號値，而於該液晶顯示波 形（COM及SEG)進行切換時導通，降低上述電位分壓器51 之阻値，以提供足夠的瞬間電流，並有效地減少液晶顯示 波形之尖峰信號，而在平時，該切換裝置53則不導通，以 維持該電位分壓器之阻値於一定値，藉此可減少漏電流。 下列實施例即以上述架構爲前提，並依此予以說明。 第一實施例 請參閱圖3，ϊ系顯示本發明液晶顯示驅動器之偏壓電 位產生裝置50之一實施例，該偏壓電位產生裝置50係與 一液晶顯示驅動器40連接，其包括一電位分蹬器51，一 切換裝置53，及一信號產生裝置55。 電位分壓器51由外部電源Vcc構成一直流路徑，該 路徑包括複數個串聯的分壓電阻，例如5個loom之高阻 値電阻，依此可在電阻間之節點a〜e產生5個對應的偏 壓電位Va〜Ve，待機信號STANDBY則用以控制偏壓位 準Ve爲邏輯l(Vcc)或0電位，其關係如表一所示： --------II (請先閲讀背面之注意事項再填寫本頁)Printed by the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs 5. Description of the invention (3) A low-resistance resistor 'to provide a sufficiently rough current to reduce spikes in the waveform. One of the features of the present invention is that the bias voltage potential generating device of the liquid crystal display driver has a low resistance in parallel with the voltage dividing resistor of the potential divider to dynamically supply a large current. The second feature of the present invention is that, by switching the device; setting to determine the upper part of the low-yin yin sub-pressure thunder yin. Fishing, joint-or not. Ben Ming is famous for three, using a signal generating device to generate liquid The crystal display switching signal is used to dynamically control the switching of the switching device when the liquid crystal display waveform changes, and accordingly connects the low resistance and the voltage dividing resistor trace, thereby generating a large instantaneous current. To achieve the above object, a bias voltage potential generating device of a liquid crystal display driver of the present invention includes: a potential voltage divider, which is formed by a plurality of voltage dividing resistors connected in series, and a plurality of voltage dividing resistors are formed by the voltage dividing resistors The DC path of the node, and according to the bias potential of the node, the liquid crystal display driver outputs a plurality of liquid crystal display waveforms; a signal generating device for outputting a synchronous switching signal when switching with the liquid crystal display waveform; and a The switching device has a plurality of switching units connected in parallel with the voltage-dividing resistor. The switching unit can form a first parallel to the voltage-dividing resistor when the liquid crystal display waveform is switched according to the switching signal value of the signal generating device. Two resistors, and open circuit at other times. Among them, the above-mentioned switching device can also be a complex value switching switch with internal resistance. The size of this paper is applicable to the Chinese National Standard (CNS) M specification (2 丨 0 X 297mm_) " ~~ ------- -{^ ~ r 装 ------ 訂 ----- (k-(Please read the precautions on the back before filling in this page) Printed by the Ministry of Economic Affairs Central Standards Bureau Zhengong Consumer Cooperative 760 A7 B7 5 2. Description of the invention (4) Element, which is connected in parallel with each of the above-mentioned voltage-dividing resistors, the threshold can be switched according to the switching image number of the signal generating device, and the _ 于 _ 蓝 _ 晶 _ 气 示 waveform. , So that the 1¾ service is connected in parallel with the voltage-dividing group, and an open circuit is formed in the non-conducting diode. The bias voltage potential generating device of another liquid crystal display driver of the present invention includes: a potential divider , Composed of a plurality of piezoresistors connected in series, and using the voltage-dividing resistors to excite a DC path with a plurality of nodes, and each component voltage resistance must contain a first resistor and a series connected Two resistors can be used to make the LCD driver output multiple LCD display waveforms according to the bias voltage of the node; A generating device for outputting a synchronous switching signal when switching with the liquid crystal display waveform; and a switching device having a plurality of switching units connected in parallel with the second resistor, the switching unit can be based on the switching signal value of the signal generating device And when the liquid crystal display waveform is switched on, it is turned on to form a short circuit, and it is not turned on during the rest of the time, forming an open circuit. In addition, the first method of generating a bias potential of the liquid crystal display driver of the present invention includes the following steps: ( a) Use a potential divider composed of a plurality of voltage-dividing resistors in series to form a DC path with a plurality of nodes by the voltage-dividing resistor; (b) According to the bias voltage potential of the node, to make the above The liquid crystal display driver outputs a plurality of liquid crystal display waveforms; (c) A signal generating device is used to output the above-mentioned liquid crystal display waveforms. 6 The paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm). ----- --------- IT ----- r '. ^ (Please read the precautions on the back before filling in this page) A7 B7 printed by the Staff Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs DESCRIPTION OF THE INVENTION (5) Synchronous switching signal when switching; and (d) Using a switching device with a plurality of switching units, the switching unit is connected in parallel with the voltage dividing resistor, and the switching unit is based on the signal generating device Switching signal value, and when the liquid crystal display waveform is switched, a second resistor is formed in parallel with the voltage dividing resistor, and the circuit is formed at the rest of the time. The second method of generating bias potential of the liquid crystal display driver of the present invention , Which includes the following steps = (a) Use a potential divider formed by a plurality of voltage-dividing resistors connected in series to form a straight running path with a plurality of nodes by the voltage-dividing resistors; (b) According to the node Bias potential to enable the liquid crystal display driver to output a plurality of liquid crystal display waveforms; (c) use a signal generating device to output a synchronous cut signal that switches with the liquid crystal display waveform; and (d) use a complex number A switching device including an internal resistance switching unit, the switching unit is connected in parallel with the voltage dividing resistor, and the switching unit is generated according to the signal The switching signal value is turned on when the liquid crystal display waveform is switched, so that the internal resistance is connected in parallel with the voltage divider resistance, and is not turned on for the rest of the time, forming an open circuit. The third method for generating a driving potential of a liquid crystal display of the present invention includes the following steps: (a) A potential divider formed by connecting a plurality of varistor resistors in series is used to form a plurality of nodes DC path, and each component piezoresistor contains a first resistance and a second power connected in series with it 7 -------- ^ ί 衣 ------ 定 ----- cr (Please read the precautions on the back before filling in this page) This paper scale is applicable to the Chinese National Standard (CNS) A4 specification (2I0X297 mm) 3 1760 A7 B7 5. Invention description (6) Resistance; (b) According to the node The bias potential generates the liquid crystal display driving potential so that the liquid crystal display driver outputs a plurality of liquid crystal display waveforms; (c) uses a signal generating device to output a synchronous switching signal when switching with the liquid crystal display waveform; and (d) Using a switching device with a plurality of switching units, the switching unit is connected in parallel with the second resistor, and the switching unit can be switched according to the switching signal value of the signal generating device when the liquid crystal display waveform is switched Turn on, form Road, and the rest of the time in non-conductive, form an open circuit. In order to make the above and other objects, features, and advantages of the present invention more comprehensible, a preferred embodiment is described below in conjunction with the attached drawings, which are described in detail as follows: Brief description of the drawings: Figure 1 It is a structural diagram showing a conventional bias voltage potential generating device of a liquid crystal display driver; FIG. 2 is a block diagram showing a bias voltage potential generating device of a liquid crystal display driver of the present invention; FIG. 3 is a diagram showing a liquid crystal display driver of the present invention First embodiment of the bias voltage generating device; FIG. 4A shows a second embodiment of the bias voltage potential generating device of the liquid crystal display driver of the present invention; FIG. 4B shows one of the partial switching devices 53 in FIG. 4A Example; Figure 4C shows the equivalent circuit diagram of Figure 4B; 8 (please read the precautions on the back before filling this page) \ 1 ---., I Λ --- ^) -installation --- --- order ----- iv line The paper standard printed by the employee consumer cooperative of the Central Bureau of Standards of the Ministry of Economics is applicable to the Chinese National Standard (CNS) A4 specification (2 丨 Ο X 297mm) A7 V. Invention description (7 Figure 5 shows the bias potential of the liquid crystal display driver of the present invention The third embodiment of the biological device; Figure 6 is a pulse timing diagram showing the switching of the liquid crystal display waveform; Figure 7 is a typical liquid crystal display waveform; Figure 8A is a liquid crystal display driver output under a no load LCD display waveform; Figure 8B shows the liquid crystal display waveform output by a liquid crystal display driver when the potential divider's voltage divider resistance is 100AΩ; Figure 8C shows a liquid crystal display driver's voltage divider resistance at the potential voltage divider is The liquid crystal display waveform output at 50 poises; An 8D graph shows the liquid crystal display waveform output by a liquid crystal display driver when the voltage divider of the potential divider is 25 slack. Please refer to FIG. 2, which is a block diagram showing the bias voltage potential generating device of the liquid crystal display driver of the present invention. The bias voltage potential generating device 50 of the liquid crystal display driver is connected to a liquid crystal display driver 40. The liquid crystal display driver 40 Then, the clock signal CLK from the signal generating device 55 is received. Printed by the Beigong Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs (please read the precautions on the back before filling in this page) The LCD display drive potential generating device 50 includes a potential divider 51 'which is divided by a voltage source V, And generate a bias voltage to drive the liquid crystal display driver 40, and according to the received clock signal CLK. To output a liquid crystal display waveform to a liquid crystal display panel 30, which includes a plurality of common signals COM (Common Signals) and Segment signal SEG (Segment Signals) ° Among them, the signal generating device 55 can be used to output the above-mentioned liquid crystal display waveform (COM and 9) according to the system clock sysck (system clock). The paper standard is applicable to the Chinese National Standard (CNS) A4 specification (210 Father 297 mm 1 A7 B7 5. Description of the invention (8) SEG) Synchronous switching signal LCDPULSE and clock signal CLK at the time of switching.-Switching device 53, which is connected to the above-mentioned potential divider 51 to generate according to the above-mentioned signal The switching signal value of the device is turned on when the liquid crystal display waveform (COM and SEG) is switched to reduce the resistance value of the potential divider 51 to provide sufficient The instantaneous current effectively reduces the peak signal of the liquid crystal display waveform, and in normal times, the switching device 53 is not turned on to maintain the resistance of the potential divider to a certain value, thereby reducing leakage current. The following embodiments This is based on the premise of the above-mentioned structure and will be explained accordingly. The first embodiment is shown in FIG. 3, which shows an embodiment of a bias voltage potential generating device 50 of the liquid crystal display driver of the present invention. The bias voltage potential generating device The 50 series is connected to a liquid crystal display driver 40, which includes a potential divider 51, a switching device 53, and a signal generating device 55. The potential divider 51 is constituted by an external power supply Vcc, and the path includes a plurality of Series voltage-dividing resistors, such as 5 high-resistance resistors with loom, can generate 5 corresponding bias potentials Va ~ Ve at the nodes a ~ e between the resistors, and the standby signal STANDBY is used to control the bias voltage The quasi-Ve is logic l (Vcc) or 0 potential, and the relationship is shown in Table 1: -------- II (please read the precautions on the back before filling this page)
、1T 經濟部中央標準局員工消費合作社印製 本纸張尺度適用中國國家榇準（CNS〉Α4规格（210X297公釐） 321?6〇 A7 B7 發明説明（9) 表一 STANDBY =1 時 Vc=〇 STANDBY =0 時 Ve=l Va=4/5 Vcc Va=Vcc Vb=3/5 Vcc Vb=Vcc Vc=2/5 Vcc Vc=Vcc Vd=l/5 Vcc Vd=Vcc 其中’該液晶顯不驅動器之偏壓電位Va〜Ve可用以 驅動液晶顯示驅動器4〇輸出類比之液晶顯示波形，且能藉 待機信號STANDBY·切換至Vcc，其包括共用信號C0Ml 〜C0M8，及段信號SEG1〜SEG40。 •Μ» 一切換裝置53係由複數切換單元Sa〜Se構成，每一 切換單元均包括一開關SW及一串聯的低電阻，例如 1〇泊’用以與上述電位分壓器51之各分壓電阻並聯連接。 經濟部中央標準局員工消費合作社印裝 (請先閲讀背面之注意事項再填寫本頁} 一信號產生裝置55，係用來產生一液晶顯示切換信 號LCDPULSE，以決定該切換裝置53之開關導通與否， 例如’該切換信號LCDPUSLE可用以在上述液晶親示波形 進行切換時，同步控胤切內各切梅罝元iTTt 之開關SW，如輸出邏輯1電位使其導通，此時，原分壓 電阻之100 將與低電阻10 q並聯，而產生較低之9.09 K2 昀並聯電阻’如此，即可使節點a〜e的偏壓電位Va〜 Ve有足夠的瞬間電流It，以驅動液晶顯示波形的切換。 同時’在未進行液晶顯示波形切換的期間，該信號產 生裝置55即產生一邏輯〇電位的液晶顯示切換信號 LCDPULSE ’使上述串聯低電阻之開關SW不導通（開路）’ 本纸張尺度適用中國國家橾準（CNS ) A4規格（2I0X297公釐） A7 A7 經濟部中央標率局員工消费合作社印製 _____B7_ 五、發明説明（10 如此將維持原分壓電阻爲100/tQ之高阻値，倘若偏壓電位 Ve爲邏輯0電位接地，而外部電源Vcc爲5V，則直流電 流Id將只有5ν/500ΑΩ=10如。 此外’本發明之液晶顯示驅動器之偏壓電位產生裝置 中，於偏壓電位Ve之節點e處，係以一待機信號STANDBY' 予以控制’亦即’當液晶顯7pc器進入待機模式（standby mode) 時，會輸出一邏輯0電位的待機信號STANDBY，透過反 聞52 ’卽點f之偏壓電等於Ve)被拉升至一電位、如 Vcc，如此將可使產生漏電流的直流電流id減少爲0。 第二實施例 請參閱圖4A〜4C，係顯示本發明偏壓電位產生裝置 5〇之另一實施例，其中，與前述具相同代號之元件，表示 相同功能之元件，在此不另贅述。 本實施例之最大特徵在於，切換裝置53係由複數個 具內阻K的開關SW構成，其與上述電位分壓器51之各分 壓電阻並聯連接，當該開關SW導通時，會產生一低的內 阻R,，其與分壓電阻並聯，而在開關SW不導通時，則不 會有任何電流流過。 如第4B圖所示，上述具內阻心之開關SW的較佳實 施例如爲長通道傳輸閘（long channel transmission gate)， 圖4B係顯示第4A圖之部分結構，其顯示一傳輸閘54與 節點a之分壓電阻並聯的情形，而.圖4C則爲其等效電路示 意圖。 該傳輸閘54爲一 CMOS結構，包括一 NMOS電晶體 ---------- (請先閱讀背面之注意事項再填寫本買) 訂1. The paper standard printed by the Employee Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs is applicable to the Chinese National Standard (CNS> A4 specifications (210X297mm) 321? 6〇A7 B7 Description of invention (9) Table 1: STDBY = 1 = Vc = 〇STANDBY = 0 Ve = l Va = 4/5 Vcc Va = Vcc Vb = 3/5 Vcc Vb = Vcc Vc = 2/5 Vcc Vc = Vcc Vd = l / 5 Vcc Vd = Vcc The bias voltages Va ~ Ve of the driver can be used to drive the LCD driver 40 to output an analog LCD display waveform, and can be switched to Vcc by the standby signal STANDBY ·, which includes the common signals C0M1 ~ C0M8, and the segment signals SEG1 ~ SEG40. • Μ »a switching device 53 is composed of a plurality of switching units Sa ~ Se, each switching unit includes a switch SW and a low resistance in series, such as 10 Po ′ used to divide with the above potential divider 51 The piezoresistor is connected in parallel. Printed by the Staff Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs (please read the precautions on the back before filling in this page) A signal generating device 55 is used to generate a liquid crystal display switching signal LCDPULSE to determine the switching device Whether the 53 switch is turned on or not, for example, The signal LCDPUSLE can be used to synchronously control the switch SW of each cut-off element iTTt in the switch when the above-mentioned liquid crystal display waveform is switched. If the logic 1 potential is output to make it conductive, at this time, the original divider resistance of 100 will be The resistance 10 q is connected in parallel, resulting in a lower 9.09 K2. The parallel resistance is 'this way, the bias potentials Va ~ Ve of nodes a ~ e have enough instantaneous current It to drive the switching of the liquid crystal display waveform. At the same time' During the period when the liquid crystal display waveform is not switched, the signal generating device 55 generates a logic zero potential liquid crystal display switching signal LCDPULSE 'make the above series low resistance switch SW non-conductive (open circuit)' Standard (CNS) A4 specification (2I0X297mm) A7 A7 Printed by the Employee Consumer Cooperative of the Central Standardization Bureau of the Ministry of Economic Affairs _____B7_ V. Description of invention (10 This will maintain the high resistance of the original partial voltage resistance of 100 / tQ, if it is biased The piezoelectric potential Ve is a logic 0 potential grounded, and the external power supply Vcc is 5V, then the DC current Id will be only 5ν / 500ΑΩ = 10. In addition, the bias voltage potential generating device of the liquid crystal display driver of the present invention In the node e of the bias potential Ve, it is controlled by a standby signal STANDBY, that is, when the LCD 7pc enters standby mode, a standby signal STANDBY of logic zero potential is output. Through the reverse hearing, the bias voltage at 52 ° + f is equal to Ve) and is pulled up to a potential, such as Vcc, so that the DC current id that generates leakage current can be reduced to zero. For the second embodiment, please refer to FIGS. 4A to 4C, which show another embodiment of the bias potential generating device 50 of the present invention, in which the components with the same code as the above represent components with the same function, which are not repeated here. . The biggest feature of this embodiment is that the switching device 53 is composed of a plurality of switches SW with an internal resistance K, which are connected in parallel with each voltage dividing resistor of the potential divider 51. When the switch SW is turned on, a switch The low internal resistance R, which is connected in parallel with the voltage-dividing resistor, and when the switch SW is not conducting, no current flows. As shown in FIG. 4B, a preferred embodiment of the switch SW with internal resistance is a long channel transmission gate. FIG. 4B shows a partial structure of FIG. 4A, which shows a transmission gate 54 and The voltage divider of node a is connected in parallel, and Figure 4C is the schematic diagram of its equivalent circuit. The transmission gate 54 is a CMOS structure, including an NMOS transistor ---------- (please read the precautions on the back before filling in this purchase)
•P (210X297公釐） 經濟部中央樣準局貝工消費合作社印製 物760 八7 B7 五、發明説明（11) Q1及一 PMOS電晶體Q2，其分別具有閘極Gl、G2，而 由上述信號產生裝置55產生之切換信號LCDPULSE，則 與信號LCiDPULSE共同作爲互補式閘極電壓，另在電源 Vcc端爲源極S，在節點a處爲汲極D。 當液晶顯示波形欲進行切換時，信號產生裝置55會 輸出一邏輯1電位之切換信號LCDPULSE，如此NMOS電 晶體Q1及PMOS電晶體Q2皆爲導通，且該傳輸閘54有 如一連接電源Vcc與節點a之低電阻心，其與分壓電阻 100ΛΩ並聯，而產生較小之並聯電阻。 反之，信號產生裝置55會輸出一邏輯0電位之切換 信號LCDPULSE，使得，NMOS電晶體Q1及PMOS電晶 體Q2皆無法導通，形成斷路，如此，電位分壓器51仍爲 —由複數個分壓電阻100ΛΩ串聯而成，並藉高阻値減少直 流電流。 第三實施例 請參閱第5圖，係顯示本發明偏壓電位產生裝置50 之另一實施例，其中，與前述具相同代號之元件，表示相 同功能之元件，在此不另贅述。 本實施例之最方特徵在於，電位分壓器51中用作節. 點a〜e之各分壓電阻，係分別由一組高電阻與低電阻串 聯而成，例如90松與10ΑΩ，而切換裝置53則由複數個開 關SW構成，其分別與上述分壓電阻之高電阻（如90ΛΩ)並 聯連接。 如此，當上述液晶顯示波形進行切換時，會同步控制 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） --------c-r裝------订-----/k f請先閲請背面之注意事項再填寫本頁) 經濟部中央標準局貝工消费合作社印裝 A7 ____ B7 五、發明説明（13 切換裝置53內各開關sw，如由信號產生裝置55輸出邏 輯1電位之液晶顯示切換信號LCDPULSE，使其導通並藉 此形成短路，因此該電位分壓器51之分壓電阻，係由較低 之電阻10 ΛΩ串聯而成，可動態地提供較多的瞬間電流It， 以驅動液晶顯示波形的切換。 反之’則由信號產生裝置55輸出邏輯〇電位之液晶 顯示切換信號LCDPULSE，使其關閉形成斷路，因此該電 位分壓器51之各分壓電阻，係由較高電阻9〇m與較低電 阻ιολω串聯爲一 loom之高電阻，如此，將使形成漏電流 之直流電流Id減少。 爲說明前述實施例之工作原理，請參閱第6圖，該圖 顯示液晶顯示波形切換之脈波時序圖，其中，CLK爲信號 產生裝置55依據系統時鐘sysck產生之時脈信號（LCD Clock)’用以使液晶顯示驅動器40依偏壓電位輸出波形， 如圖所示，當欲驅動共用信號COM1、COM2進行波形切 換時’信號產生裝置55會同步的產生切換信號 LCDPULSE，使得原電位分壓器51之高阻値_重阻與切換裝 置、53藉開關.SW導通產生之低電阻並聯，進而可得到較大 的瞬間電流。 其中，上述電位分壓器51與並聯之切換裝置53可構 成一動態分壓電阻DYNR，在信號產生裝置55產生之切 換信號LCDPULSE期間，切換裝置53之開關導通，使得 原電位分壓器51之高電阻與切換裝置53之低電阻並聯而 得一電阻Ra，例如第一實施例中節點a之分壓電阻此時爲 ---------- (請先閲讀背面之注意事項再填寫本頁) 訂 Ρ 本紙張尺度適用中國國家橾準（CMS ) A4規格（210X297公釐）. 經濟部中央橾準局員工消费合作社印裝 3H760 A7 __ _B7___ 五、發明説明（l3) (100 X 10)/(100+10)=9.09ΑΩ。 反之，切換裝置53之開關並不導通，此時，電位分 壓器51之分壓電阻仍維持爲高阻値Rb ’例如1〇〇ΛΩ，其 用來維持低的漏電流。 依據上述實施例可得三種液晶顯示驅動器之偏壓電 位產生方法，其皆適用於一液晶顯示驅動器40 ° 第一種液晶顯示驅動器之偏壓電位產生方法，配合圖 3及第一實施例，其包括下列步驟： (a) 利用一由複數個分壓電阻（100 ΑΩ)串聯而成的電位 分壓器51，並使其與一電壓源Vcc連接，以藉訖分壓電阻 形成一具複數個節點（a〜e)之直流路徑。 ， (b) 依據該節點之偏壓電位(Va〜Ve)，以使上述液晶 顯示驅動器40輸出複數個液晶顯示波形（COM1〜 COM8，SEG1 〜SEG40)。 (0利用一信號產生裝置55，以輸出與上述液晶顯示 波形進行切換時的同步切換信號LCDPULSE。 (d)利用一具有複數個切換單元（Sa〜Se)之切換裝置 53 ’使該切換單元與上述分壓電阻並聯，且使該切換單元 依據上述信號產生裝置之切換信號値，而於該液晶顯示波 形進行切換時，形成一與該分壓電阻並聯的第二電阻 (10ΛΩ) ’且於其餘時間形成斷路。 第二種液晶顯示驅動器之偏壓電位產生方法，配合圖 4A〜4C及第二實施例，其包括下列步驟： (a)利用一由複數個分壓電阻（100 ΑΩ)串聯而成的電位 本紙張尺度適用中國國家操準（CNS ) A4C格（210X297公釐） -------(.丁裝-- (請先閱讀背面之注意事項再填寫本頁) -'s 經濟部中央標準局員工消費合作社印製 A7 B7 i、發明説明（Η 分壓器51，並使其與一電壓源Vcc連接，以藉該分壓電阻 形成一具複數個自卩點（a〜e)之直流路徑。 (b) 依據該節點之偏壓電位（Va〜Ve)，以使上述液晶 顯示驅動器輸出複數個液晶顯示波形（C0M1〜C0M8， SEG1 〜SEG40)。 (c) 利用一信號產生裝置55，以輸出與上述液晶顯示 波形進行切換時的同步切換信號LCDPULSE。 (d) 利用一具有複數個含內阻（R,)之切換單元（SW)的 切換裝置53，使該切換單元與上述分壓電阻並聯，且使該 切換單元依據上述信號產生裝置之切換信號値，而於該液 晶顯示波形進行切換時導通，使該內阻(R〇與分壓電阻並 聯，且於其餘時間不導通，形成斷路。 第三種液晶顯示驅動器之偏壓電位產生方法，配合圖 5及第3實施例，其包括下列步驟： (a) 利用一由複數組分壓電阻串聯而成的電位分壓 器，並使其與一電壓源Vcc連接，以藉該分壓電阻形成一 具複數個節點（a〜e)之直流路徑，且每一組分壓電阻均含 —第一電阻（10尬）及一與之串聯的第二電阻（9〇Κ〇 ; (b) 依據該節點之偏壓電位(Va〜Ve)，以使上述液晶 顯示驅動器40輸出複數個液晶顯示波形； (c) 利用一信號產生裝置55，以輸出與上述液晶顯示 波形進行切換時的同步切換信號LCDPULSE ; (d) 利用一具有複數個切換單元（SW)之切換裝置53， 使該切換單元與上述第二電阻(90ΑΩ)並聯，且使該切換單 本紙張尺度適用中國國家樣準（CNS ) A4規格（2!〇χ297公釐） --------裝------訂-----(衆 (請先閲讀背面之注意事項再填寫本頁) A7 B7 五、發明説明（15) 元可依據上述信號產生裝置之切換信號値，而於該液晶顯 示波形進行切換時導通，形成短路，且於其餘時間不導通， 形成斷路。 功效 典型的液晶顯示波形係如圖7所示，其以共用信號 C0M1、COM2、COM3及段信號SEGX爲例，其中，液 晶顯示驅動器40由各節點之偏壓電位Va〜Ve驅動。 而透過示波器顯示，在不同的情況下，利用本發明之 液晶顯示驅動器之偏壓電位產生方法及其裝置，可以在液 晶顯示波形切換時’動態地提供一較小的分壓電阻，減少 尖峰信號的產生’而平時，則利用高阻値電阻來維持低的 漏電流。請參閱第8A至8D圖。 如第8A圖所示，其顯示一液晶顯示驅動器在一無負 載下輸出的液晶顯示波形SEGX，C0M6，由圖可知，其 波形十分良好，甚少尖峰信號。 經濟部中央標準局員工消资合作社印裝 >裝-- (請先閱讀背面之注意事項再填寫本頁) '壤 如第8B圖所示，其顯示一液晶顯示驅動器在電位分 壓器之分壓電阻爲100松時輸出的液晶顯示波形SEGx， COM3。由圖可知，在高阻値下，其產生之尖峰信號十分 . 明顯，且只要能在這波形切換時，動態地降低分壓電阻之 阻値，即可提供較大的驅動電流，使尖峰信號減少。 如第8C圖所示，係顯示一液晶顯示驅動器輸出的液 晶顯不波形SEGX ’ COM4，其藉由本發明之液晶顯不驅 動器之偏壓電位產生方法及其裝置，使電位分壓器之分壓 電阻在液晶顯示波形切換時降爲50ΑΩ時之圖形。由圖可 本紙乐尺度適用中國國家標準（CNS) A4规格（21〇χ297公瘦） ^21760 A7 B7 五'•發明説明（ 知，其尖峰信號已經減少。 如第8D圖所示，係顯示〜液晶顯示驅動器輸出的液 晶顯示波形SEGX，COM3，其藉由本發明之液晶顯示驅 動器之偏壓電位產生方法及其裝置，使電位分壓器之分壓 電阻在液晶顯示波形切換時降爲25ΑΩ時之圖形。由圖可 .知，其尖峰信號更是大爲減少，而呈一良好之波形。 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爲準。 --------^v裝-- (請先閲讀背面之注意事項再填寫本頁)• P (210X297mm) Printed product 760 8.7 7 B7 of the Beigong Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs 5. Description of the invention (11) Q1 and a PMOS transistor Q2, which have gates Gl and G2, respectively, and The switching signal LCDPULSE generated by the signal generating device 55 is used as the complementary gate voltage together with the signal LCiDPULSE, and the source S at the power supply Vcc terminal and the drain D at the node a. When the liquid crystal display waveform is to be switched, the signal generating device 55 will output a logic 1 potential switching signal LCDPULSE, so that both the NMOS transistor Q1 and the PMOS transistor Q2 are turned on, and the transmission gate 54 is as if connecting the power supply Vcc and the node The low resistance center of a is connected in parallel with the voltage divider resistance 100ΛΩ, and a smaller parallel resistance is generated. On the contrary, the signal generating device 55 will output a logic zero potential switching signal LCDPULSE, so that neither the NMOS transistor Q1 nor the PMOS transistor Q2 can be turned on, forming an open circuit. Thus, the potential divider 51 is still divided by a plurality of voltage dividers The resistors are formed in series with 100ΛΩ and reduce the DC current by high resistance. Third Embodiment Please refer to FIG. 5, which shows another embodiment of the bias potential generating device 50 of the present invention, in which the components with the same code as the above represent components with the same function, which will not be repeated here. The most characteristic feature of this embodiment is that the potential divider 51 is used as a node. The voltage divider resistors of points a ~ e are respectively formed by a series of high resistance and low resistance in series, such as 90 loose and 10ΑΩ, and The switching device 53 is composed of a plurality of switches SW, which are respectively connected in parallel with the high resistance (such as 90ΛΩ) of the voltage dividing resistor. In this way, when the above-mentioned liquid crystal display waveform is switched, the paper scale will be synchronously controlled in accordance with the Chinese National Standard (CNS) A4 specification (210X297 mm) -------- Cr installation ------ order- --- / kf, please read the precautions on the back and fill in this page) A7 ____ B7 printed by the Beigong Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 5. Description of the invention (13 The switches sw in the switching device 53, if generated by signals The device 55 outputs a liquid crystal display switching signal LCDPULSE of logic 1 potential to make it conductive and thereby form a short circuit. Therefore, the voltage divider of the potential divider 51 is formed by a series connection of a lower resistance of 10 ΛΩ, which can be dynamically provided More instantaneous current It drives the switching of the liquid crystal display waveform. Conversely, the signal generating device 55 outputs a liquid crystal display switching signal LCDPULSE of a logic zero potential to turn it off to form an open circuit, so the potential divider 51 is divided The piezoresistor is composed of a higher resistance of 9〇m and a lower resistance of ιολω in series to form a high resistance of loom, so that the DC current Id forming the leakage current will be reduced. To illustrate the working principle of the foregoing embodiment, please refer to FIG. 6 is a timing diagram of the pulse wave of the liquid crystal display waveform switching, where CLK is the clock signal (LCD Clock) generated by the signal generating device 55 according to the system clock sysck to enable the liquid crystal display driver 40 to be biased The output waveform, as shown in the figure, when the common signals COM1 and COM2 are to be driven for waveform switching, the signal generating device 55 will synchronously generate the switching signal LCDPULSE, so that the high-resistance value _ heavy resistance of the original potential divider 51 and the switching device 53. The low resistance generated by the switch.SW conduction is connected in parallel to obtain a larger instantaneous current. Among them, the potential divider 51 and the parallel switching device 53 can form a dynamic voltage divider resistance DYNR in the signal generating device 55 During the generated switching signal LCDPULSE, the switch of the switching device 53 is turned on, so that the high resistance of the original potential voltage divider 51 and the low resistance of the switching device 53 are connected in parallel to obtain a resistance Ra, such as the voltage dividing resistance of the node a in the first embodiment This time is ---------- (please read the precautions on the back before filling in this page). The paper size is applicable to China National Standard (CMS) A4 (210X297mm). 3H760 A7 __ _B7___ printed by the Central Consumer ’s Consumer Cooperative of the Ministry of Economic Affairs V. Invention description (l3) (100 X 10) / (100 + 10) = 9.09ΑΩ. On the contrary, the switch of the switching device 53 is not turned on The voltage-dividing resistance of the potential divider 51 is still maintained at a high resistance value Rb ′, such as 100 Ω, which is used to maintain a low leakage current. According to the above embodiment, three methods of generating bias potentials for the liquid crystal display driver can be obtained , Which are all suitable for a liquid crystal display driver 40 ° the first method of generating a bias potential of the liquid crystal display driver, with FIG. 3 and the first embodiment, which includes the following steps: (a) using a plurality of voltage-dividing resistors (100 ΑΩ) a potential divider 51 formed in series, and connected to a voltage source Vcc to form a DC path with a plurality of nodes (a ~ e) by dividing the resistor. , (B) According to the bias potential of the node (Va ~ Ve), the liquid crystal display driver 40 outputs a plurality of liquid crystal display waveforms (COM1 ~ COM8, SEG1 ~ SEG40). (0 Use a signal generating device 55 to output a synchronous switching signal LCDPULSE when switching with the above-mentioned liquid crystal display waveform. (D) Use a switching device 53 'with a plurality of switching units (Sa ~ Se) to make the switching unit and The voltage dividing resistors are connected in parallel, and the switching unit is formed according to the switching signal value of the signal generating device, and when the liquid crystal display waveform is switched, a second resistor (10ΛΩ) connected in parallel with the voltage dividing resistor is formed and the rest Time forms a disconnection. The second method of generating a bias potential for a liquid crystal display driver, in conjunction with FIGS. 4A-4C and the second embodiment, includes the following steps: (a) Use a plurality of voltage-dividing resistors (100 Ω) in series The paper size of the potential is applicable to the Chinese National Standards (CNS) A4C grid (210X297mm) ------- (. Dingzhuang-- (please read the precautions on the back and fill in this page)-' s A7 B7 printed by the Staff Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs i. Description of invention (H voltage divider 51 and connected to a voltage source Vcc to form a plurality of self-representation points (a ~ E) DC path (b) According to the bias potential of the node (Va ~ Ve), the liquid crystal display driver can output a plurality of liquid crystal display waveforms (C0M1 ~ C0M8, SEG1 ~ SEG40). (c) Use a signal generating device 55 to Output the synchronous switching signal LCDPULSE when switching with the above-mentioned liquid crystal display waveform. (D) Use a switching device 53 having a plurality of switching units (SW) including internal resistance (R,) to make the switching unit and the voltage dividing resistor In parallel, and the switching unit is turned on when the liquid crystal display waveform is switched according to the switching signal value of the above-mentioned signal generating device, so that the internal resistance (R〇 and the voltage-dividing resistor are connected in parallel, and is not turned on for the rest of the time, forming an open circuit The third method for generating the bias potential of the liquid crystal display driver, in conjunction with FIG. 5 and the third embodiment, includes the following steps: (a) Use a potential divider formed by a plurality of piezoresistors in series, and It is connected to a voltage source Vcc to form a DC path with a plurality of nodes (a ~ e) by the voltage-dividing resistor, and each component of the piezoresistive resistor includes-a first resistor (10) and a The first Two resistors (9〇Κ〇; (b) according to the node bias voltage potential (Va ~ Ve), so that the liquid crystal display driver 40 outputs a plurality of liquid crystal display waveforms; (c) using a signal generator 55, Output the synchronous switching signal LCDPULSE when switching with the above-mentioned liquid crystal display waveform; (d) Using a switching device 53 having a plurality of switching units (SW), make the switching unit parallel to the second resistor (90ΑΩ), and make the Switching the size of the single paper is applicable to the Chinese National Standard (CNS) A4 specification (2! 〇χ297mm) -------- installed ------ order ----- (Public (please read first (Notes on the back and then fill in this page) A7 B7 V. Description of the invention (15) The element can be turned on when the LCD display waveform is switched according to the switching signal value of the above-mentioned signal generating device, and a short circuit is formed, and it is not turned on the rest of the time , Forming an open circuit. Efficacy A typical liquid crystal display waveform is shown in FIG. 7, which uses the common signals COM1, COM2, COM3 and the segment signal SEGX as an example. The liquid crystal display driver 40 is driven by the bias potentials Va ~ Ve of each node. According to the oscilloscope display, under different circumstances, the use of the method and device for generating the bias potential of the liquid crystal display driver of the present invention can dynamically provide a smaller voltage divider resistance when the liquid crystal display waveform is switched to reduce the peak The generation of the signal 'usually uses high-resistance resistors to maintain low leakage current. Please refer to figures 8A to 8D. As shown in Fig. 8A, it shows a liquid crystal display waveform SEGX, C0M6 output by a liquid crystal display driver under no load. As can be seen from the figure, the waveform is very good, and there are few spikes. Printed by the Central Bureau of Economic Affairs of the Ministry of Economic Affairs Staff Cooperative Printed> (Please read the precautions on the back before filling out this page) 'As shown in Figure 8B, it shows a liquid crystal display driver in the potential divider The liquid crystal display waveform SEGx, COM3 output when the voltage divider resistance is 100 slack. It can be seen from the figure that under high resistance value, the peak signal generated by it is very obvious. And as long as the waveform can be switched, the resistance value of the voltage divider resistance can be dynamically reduced to provide a larger driving current and make the peak signal cut back. As shown in FIG. 8C, it displays a liquid crystal display waveform SEGX 'COM4 output by a liquid crystal display driver. By the method and device for generating a bias potential of the liquid crystal display driver of the present invention, the potential divider is divided The graph when the piezoresistor drops to 50AΩ when the LCD display waveform is switched. From the chart, the paper music scale is applicable to the Chinese National Standard (CNS) A4 specification (21〇χ297 male thin) ^ 21760 A7 B7 Five '• Description of the invention (know that the peak signal has been reduced. As shown in Figure 8D, it shows ~ The liquid crystal display waveform SEGX, COM3 output by the liquid crystal display driver, by the method and device for generating the bias potential of the liquid crystal display driver of the present invention, when the voltage divider of the potential voltage divider is reduced to 25AΩ when the liquid crystal display waveform is switched As can be seen from the figure, the peak signal is greatly reduced, and a good waveform. Although the present invention has been disclosed in the preferred embodiment as above, it is not intended to limit the present invention, anyone familiar with this technique However, within the spirit and scope of the present invention, some changes and modifications can be made, so the scope of protection of the present invention shall be deemed to be defined by the scope of the attached patent application. -------- ^ v installed-(please read the notes on the back before filling this page)
、1T i -.率 經濟部中央標準局員工消费合作社印裝 適一 3 尺 I私 ff 公, 1T i-. Rate Printed by the Staff Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs, suitable for 3 feet I private ff