TW200414115A - Display driving method - Google Patents

Abstract

The present invention is a driving method for display whose display area is controlled by a common grid signal and a segment grid signal. A set of common selected signal and common non-selected signal, having a phase difference between them, are combined to form a common grid signal and a set of segment selected signal and segment non-selected signal. A set of segment selected signal and segment non-selected signal, having a phase difference between them, are combined to form a segment grid signal. In a selected duty zone, the present invention allows the common grid signal and the segment grid signal to be equal to the common selected signal and the segment selected signal, respectively, and uses the phase difference between each grid signal and its corresponding selected signal to generate a driving voltage whose square root is greater than the threshold voltage. Thus, the display area is in ON condition.

Description

200414115 Description of the invention (The description of the invention should state: the technical field to which the invention belongs, the prior art, the content, the embodiments and the brief description of the drawings) The technical field to which Lingming belongs The present invention relates to a display device, and in particular A driving method for a display. In the prior art, for a Simple Matrix Liquid Crystal Display (SM-LCD), it is structured as a plurality of common electrodes (also referred to as scanning electrodes) and a plurality of segment electrodes (also referred to as scanning electrodes) arranged in a grid pattern. (Referred to as a column electrode), and a liquid crystal is sandwiched between the common electrode and the segment electrode. A driving voltage signal is externally provided between the two electrodes, so that each pixel is driven by a potential difference between the two electrodes. In addition, SM-LCD will be accompanied by the problem of mutual interference due to the increase in the number of common electrodes, so the difference between the voltage applied by the display pixels and the voltage applied by the non-display pixels will be reduced, so the number of common electrodes of the SM-LCD will be reduced. There will be restrictions. In SM-LCD, twisted nematic [j (Twisted Nematic, TN) LCDs are p-type nematic liquid crystals with anisotropic p-type ferroelectricity sealed between the electrode substrates. The major axis of the liquid crystal molecules is related to the electrodes. The planes are arranged in parallel, and from one side of the electrode substrate to the other side of the electrode substrate, the long axis direction of the liquid crystal molecules is aligned in a twist of 90 degrees. The operation principle of the TN LCD will be described next. Please refer to FIG. 1A, which shows a schematic diagram of the operation principle of the TN LCD when no external voltage is applied. It can be seen from FIG. 1A that the liquid crystal molecules 102 are distorted in alignment with the alignment directions of the surfaces of the glass substrate 104 and the glass substrate 106. Furthermore, the polarizing plate 108 and the polarizing plate 110 are used to sandwich the liquid crystal molecules 102 in an orthogonal state of 10494-PI-375 5 200414115, so that the incident light passing through the polarizing plate 108 will be distorted by 90 degrees of the liquid crystal molecules 102 (Also known as optical rotation), and the polarizing plate Π0 presents a bright state. Next, please refer to FIG. 1B, which shows a schematic diagram of the operation principle of the TN LCD when an external voltage is applied. As can be seen from Fig. 1B, the optical rotation of the liquid crystal molecules 102 disappears. Therefore, the incident light cannot pass through the polarizing plate Π0, and appears dark. For the relationship between the external voltage and the relative light transmittance of the TN LCD, please refer to Figure 2. It can be seen from Fig. 2 that when the TN type LCD is originally bright and sad, if the applied voltage exceeds the threshold voltage (Vth), the relative light transmittance will change sharply, and the TN type LCD will become dark. The relative light transmittance of the TN LCD is in a wide frequency range, which is only related to the root mean square of the driving voltage 値 Vrms, which is νπι ^ Ίί [Τ (ί)] 2Λ ·. · (1), where V⑴ is the voltage difference, and T is the single V i 0 bit time. For current TN-type LCDs, the driving methods need to adopt a multi-voltage output method, and the LCD display is achieved by the voltage difference. As a result, an additional bias voltage-dividing circuit is required, which increases the operating current. This has the problem that the battery-powered LCD cannot operate for a long time. In order to better understand the conventional LCD driving method, please refer to FIG. 3A, which shows a display pattern achieved by the conventional LCD driving method. It can be seen from Fig. 3A that the 'display pattern 30' is controlled by four common electrode signals (COM1-COM4) and two segment electrode signals (SEGn, SEGn + 1). Next, please refer to FIG. 3B, which shows that 10494-PI-375 6 200414115 achieves the common selection signal, common non-selection signal, segment selection signal, segment non-selection signal, common in the display graph of FIG. 3A. Waveform diagram of electrode signal and segment electrode signal. Figure 3B also shows the signal waveform diagram of the display area added at the intersection of COM4 and SEGn. As can be seen from Figure 3B, the common electrode signal (COM 1-COM4) and the segment electrode signal (SEGn, SEGn + 1) each have four duty zones within a unit time T. Each common electrode signal has its own responsibility area at different time points as the selection responsibility area. Here, the common electrode signals in the responsibility area are selected as the common selection signal, and there are three responsibility areas as non-selection responsibility areas. The common electrode signals in the area are common non-selective signals. For example, the common electrode signal COM1 outputs a common selection signal in the range of 0-0.25T (selection responsibility area), and a common non-selection signal in the remaining 0.75T (non-selection area of responsibility). When the display area is to be turned on, the signal corresponding to the selection of the responsibility area in the segment electrode signals (SEGn, SEGn + 1) is the segment selection signal; when the display area is to be turned off, the area is turned on. The signal in the segment electrode signal corresponding to the selection of the responsibility zone is the segment non-selection signal. Furthermore, as can be seen from FIG. 3B, the bias voltage includes Vl = Vcc, V2 = 2 / 3Vcc, V3 = l / 3Vcc, and ground potential Vgnd, where Vcc is a positive voltage provided by the power supply. In the unit time T shown in Figure 3B, the voltage of the common selection signal (Vcom selection) = V1, the voltage of the common non-selection signal (Vcom selection) = V3, and the voltage of the segment selection signal (Vseg selection) = Vgnd, and the voltage of the segment non-selection signal (Vseg non-selection) = V2. Next, the on-driving voltage (Vonrms) and the off-driving voltage (VoffYms) will be obtained according to formula (1) '. 10494-PI-375 7 200414115

Vonrms = selected-㈣g selected) 2 + (transformed non-selected-bar / non-selected) 2 ϊ ’] = (V3-Vgnd / Vl) 2-T \ = 0.557Vcc

Voffrms 2-Vs ^ gim) 2 \ T + (Vcomim--g selected / not selected) 2 = # [(F1 — F2) 2 go to Γ + (F3-Fgm // F2) 2 each Γ] 4 [( ) Ten + (Bu) 2 | r] -0.333Vcc Here, assuming that the threshold voltage (Vth) = 0.45Vcc, Voffrms < Vth < Vonrms can be satisfied, that is, when the turn-on driving voltage is greater than the threshold voltage, it is displayed Area is on; and when the drive voltage is less than the threshold voltage, the display area is off. It can be known from the above that the conventional LCD controls the change of the display area by the voltage difference between the common selection signal and the segment selection signal. Since the conventional LCD display method must have a bias voltage divider circuit, etc., the operating current is large and the power consumption is large. Therefore, for LCDs supplied by batteries, there is a problem that they cannot operate for a long time. SUMMARY OF THE INVENTION In view of this, the present invention provides a method for driving a display, which uses the phase difference between a common electrode signal and a segment electrode signal when selecting a responsibility area to control the change of the display area, so there is no need to use a current-consuming bias 10494. -PI-375 8 200414115 Voltage divider circuit, etc., so it can simplify the driving circuit of the display and save power loss. To achieve the above and other objectives, the present invention provides a method for driving a display. The display includes a common electrode and a segment electrode to control changes in the display area. In this driving method, first, a common selection is provided. Only 5 tigers and a common non-selection signal are provided, in which the common selection signal and the common non-selection signal are different from each other by a first phase difference; and a segment selection signal and a segment non-selection signal are provided. , Where the segment selection signal is different from the segment non-selection signal by a phase difference. After that, the common selection signal and the common non-selection signal are combined to generate a common electrode signal and provided to the common electrode ', and the segment selection signal and the segment non-selection signal are combined to generate a segment electrode signal and provided to the segment electrode. This controls the changes in the display area. Among them, the “common electrode signal and the segment electrode signal each include 1 ^ responsibility zones within a unit time τ” N is greater than or equal to 1, and the common electrode signal includes a common selection signal of one responsibility zone and the common of N-1 responsibility zones. Non-selective signal. This one area of responsibility using the common selection signal is defined as the area of selective responsibility, and the other N-1 areas of responsibility are called non-selective areas of responsibility. When the display area is to be turned on, the signal corresponding to the selection of the responsibility zone in the segment electrode signal is the segment selection signal; when the display area is to be turned off, the corresponding selection zone is to be selected in the segment electrode signal. The signal is the non-selection signal of the segment. Furthermore, when the display area is on, the drive voltage is defined, and when the display area is off, the drive voltage is defined as:

Vonrms = do [(Fc⑽-select-heg-select) 2 taxi T + ㈧⑽ non-select-select / non-select) 2] 10494-PI-375 9 200414115

Voffrms ______ =-heart sigh non-selection) 2

Vonrms: turn on the drive voltage

Voffrms: turn off the drive voltage

Vcom selection: a common selection signal when selecting a zone of responsibility

Vcom non-election: common non-election 5 and 5 tigers when non-election of responsibility area

Vseg selection: segment selection signal when selecting the area of responsibility

Vseg non-selection: segment non-selection signal when selecting the area of responsibility

Vseg selection / Vseg non-selection: The segment selection signal or the segment non-selection signal when the responsibility zone is not selected, so that the turn-on driving voltage is greater than the threshold voltage and the turn-off driving voltage is less than the threshold voltage. In a preferred embodiment of the present invention, the phase difference between the segment selection signal and the common non-selection signal is equal to the phase difference between the segment non-selection signal and the common non-selection signal. Furthermore, the segment non-selection signal is consistent with the co-selection signal. In a preferred embodiment of the present invention, the display is a liquid crystal display. The liquid crystal display is a twisted nematic liquid crystal display. The invention also provides a driving method of the display. The display includes a common electrode and a segment electrode to control the change of the display area. In this driving method, a common selection signal and a common non-selection signal are first provided, and the common selection signal and the common non-selection signal are only provided by the first voltage bit. And the second voltage level; and will provide the segment selection signal and the segment non-selection signal, of which the segment selection signal and the segment non-selection signal are only controlled by the third power 10494-PI-375 10 200414115 And the fourth voltage level. After that, a common selection signal and a common non-selection signal are combined to generate a common electrode signal and provided to the common electrode, and a segment selection signal and a segment non-selection signal are combined to generate a segment electrode signal and provided to the segment electrode. To control the change of the display area. Among them, the common electrode signal and the segment electrode signal include N responsibility areas within a unit time τ, and the common electrode signal includes a common selection signal of one responsibility area and a common non-selection signal of N-1 responsibility areas. It is defined here that this 1 area of responsibility using the common selection signal is called the area of selection responsibility, and the other N-1 areas of responsibility are called non-selection areas of responsibility. When the display area is to be turned on, the signal corresponding to the time when the responsibility zone is selected in the segment electrode signal is to be the segment selection signal, and the drive voltage is defined; when the display area is to be turned off, the segment electrode signal is to be turned on The signal corresponding to the selection of the responsibility zone in China is the non-selection signal of the segment, and defines the drive voltage to be turned off:

Vonrms = (㈧⑽Select-Select) 21 r + (Fc⑽Not Select—Aeg Select / Not Select) 2 y Π Voffrms = Select-F Ton Select) 2 ± Γ + (F Delete Non-Select-Non-Select) 2

V Τ N N

Vonrms: turn on the drive voltage

VoffYms: turn off the drive voltage

Vcom selection: a common selection signal when selecting a zone of responsibility

Vcom non-selection: common non-selection signal when non-selection of responsibility area

Vseg selection: segment selection signal when selecting the area of responsibility

Vseg non-selection: segment non-selection signal when selecting the area of responsibility

Vseg selection / Vseg non-selection: The segment selection signal or 10494-PI-375 11 200414115 when the responsibility zone is not selected is the non-selection signal of the segment, so that the turn-on driving voltage is greater than the threshold voltage that sharply changes the light transmittance, and the drive is turned off The voltage is less than the critical voltage. In a preferred embodiment of the present invention, the first voltage level is equal to the third voltage level, and the second voltage level is equal to the fourth voltage level. In summary, the present invention generates a common electrode signal based on a group of a common selection signal with a phase difference and a common non-selection signal ', and according to another group of segment selection signals and phase non-selection signals. To combine to generate segment electrode signals. The phase difference between the common electrode signal and the segment electrode signal when selecting the responsibility area is used to generate a driving voltage whose root mean square is greater than or less than the threshold voltage to control the change of the display area. Since the present invention does not require a bias voltage dividing circuit, it can not only simplify the driving circuit of the display, but also achieve the purpose of saving power. In order to make the above and other objects, features, and advantages of the present invention more obvious and easier to understand, the following describes the preferred embodiments in conjunction with the accompanying drawings and makes a detailed description as follows: The driving method of the display is used in a liquid crystal display (such as a twisted nematic liquid crystal display (TN_LCD)). Everyone knows that the display of this type of ugly nematic liquid crystal display includes a common segment electrode. The signal provided by this common electrode and segment electrode is used to generate a root mean square greater than or greater than the display area. The driving voltage is less than the threshold voltage to control the change of the display area. Next, a driving method of the display of the present invention will be described. 10494-PI-375 12 200414115 In the driving method of the preferred embodiment of the present invention, a common selection signal and a common non-selection signal are first provided, where the common selection signal and the common non-selection signal differ by a first phase difference; and a section is provided; The selected signal and the segment non-selected signal, wherein the segment selected signal and the segment non-selected signal differ by a second phase difference. After that, the common selection signal and the common non-selection signal are combined to generate a common electrode signal and provided to the common electrode, and the segment selection signal and the segment non-selection signal are combined to generate a segment electrode signal and provided to the segment electrode, thereby Controls the change of the display area. Please refer to FIG. 4A, which shows waveform diagrams of a common selection signal, a common non-selection signal, a sector selection signal, and a sector non-selection signal of a driving method of a display according to a preferred embodiment of the present invention. As shown in Figure 4A, the common selection signal, common non-selection signal, section selection signal, and section non-selection signal all have only two voltage levels, which are the positive voltage (Vcc) and the ground potential (GND), and this positive voltage It is provided by the power supply. Furthermore, the common selection signal and the common non-selection signal have a phase difference 'and the sector selection signal and the sector non-selection signal also have another phase difference. In addition, in FIG. 4A, the phase non-selection signal and the common selection signal are in phase, and the phase difference U between the segment selection signal and the common non-selection signal is equal to the phase difference between the segment non-selection signal and the common non-selection signal. t2 'But for those skilled in the art, it should be noted that' the above assumption is only a preferred embodiment and is not intended to limit the present invention. It is assumed here that tl = t2 = t, and the 1/2 period of the common selection signal is Tf. Then 'make the common electrode signal communicate with the segment electrode. In the day, τ includes N responsibility zones, where N is a positive integer greater than or equal to 1, and the common 10494-PI-375 13 200414115 electrode signal includes 1. The common selection signal of each responsibility area and the common non-selection signal of N-1 responsibility areas. It is assumed here that this one area of responsibility using a common selection signal is called a selection area of responsibility, and the other N-1 areas of responsibility are called non-selection areas of responsibility. When the display area is to be turned on, the signal corresponding to the selection of the responsible area in the segment electrode signal is the segment selection signal; when the display area is to be turned off, the corresponding selection of the responsibility area is to be selected in the segment electrode signal. The signal is the non-selection signal of the segment. Then, when the display area is on, the rms 加 applied to the display area is greater than the threshold voltage. The driving voltage is defined as the on drive voltage. Similarly, when the display area is off, the rms 加 is added to the display area. A driving voltage that is less than the threshold voltage is defined as the closing driving voltage:

Vonrms Ί [(Fc⑽selected-Aegselected) 2 persons 7 > (Fc⑽nonselected-hegselected / nonselected) 2 Γ] ... (2)

V T N N

Voffrms = 'Shi (blue selection-non-selection) 2+ (Fc ⑽ non-selection-selection / non-selection) 2

V T N N ... (3)

Vonrms: turn on the drive voltage

Voffrms: turn off the drive voltage

Vcom selection: a common selection signal when selecting a zone of responsibility

Vcom non-selection: common non-selection signal when non-selection of responsibility area

Vseg selection: segment selection signal when selecting the area of responsibility

Vseg non-selection: segment non-selection signal when selecting the area of responsibility

Vseg selection / Vseg non-selection: The segment selection signal or the segment non-selection signal when the responsibility area is not selected. 10494-PI-375 14 200414115 Figure 4 B. The driver of the display according to a preferred embodiment of the present invention is not shown in FIG. For the common electrode signals (COM1-COM4) of the method and the waveform diagrams of the segment electrode signals of the three different display data (1111, 000, 100), please refer to FIG. 4A and FIG. 4B at the same time. In this preferred embodiment, the common electrode signals (COM1-COM4) and the segment electrode signals (SEG (llu), SEG (OOOO), SEG (IOOO)) each include four areas of responsibility within a unit time T. The common electrode signal COM1 outputs a common selection signal in the responsibility area 1 (referred to as the selection responsibility area of COM1), and outputs a common non-selection signal in the responsibility area 2-4 (referred to as the non-selection responsibility area of COM1). The common electrode signal COM2 outputs a common selection signal in the responsibility area 2 (COM2's selection responsibility area), and outputs a common non-selection signal in the responsibility areas 1, 3, and 4 (COM2's non-selection responsibility area). The common electrode signal COM3 outputs a common selection signal in the responsibility area 3 (COM3's selection responsibility area), and outputs a common non-selection signal in the responsibility areas 1, 2 and 4 (COM3's non-selection responsibility area). The common electrode signal COM4 outputs a common selection signal in the responsibility area 4 (COM4's selection responsibility area), and outputs a common non-selection signal in the responsibility area l-3 (COM4's non-selection responsibility area). When the display area is to be turned on, that is, the data to be displayed is (1111), the signals in the selection responsibility area corresponding to the four different common electrode signals in the segment electrode signal SEG (llll) are all sections. Select the signal, and the result is that the segment electrode signal SEG (1111) of this display data is equal to the segment selection signal. When the display area is to be turned off, that is, the data to be displayed is (000000), the signal when selecting the responsibility area corresponding to 4 different common electrode signals in the segment electrode signal SEG (000) The segment non-selection signal is 10494-PI-375 15 200414115. As a result, the segment electrode signal SEG (0000) of the displayed data is equal to the segment non-selection signal. When the data to be displayed is (1000), then the segment electrode signal SEG (1000) corresponds to the common electrode signal C0M1 when the responsibility zone is selected, that is, the signal at the responsibility zone 1 is equal to the zone selection signal, and the rest The signals in the responsibility zone 2-4 are the non-selection signals of the zone. According to Fig. 4A, Fig. 4B, formula (2) and formula (3), the on-driving voltage (Vonrms) and off-driving voltage (Voffrms) of this embodiment are obtained.

Vonrms

T

((Fcom selection- 仏 level selection) 2 & + (by non-selection-factory ordered selection / non-selection) 2 5 / 4Γ / 1.118

Vcc

Tf

Vcc

Voffrms

T

[(Mm election_grade non-selection) 2 / + (Rom non-selection-Fg selection / non-selection) 2 Τ [Ox ^ T ^ Vcc2 ^] I 3t w

Vcc -0.886 —Vcc \ Tf Here, assuming the threshold voltage (Vth) = 0.45Vcc, in this case: 0.45, you can make just take

10494-PI-375 16 200414115

Voffrms = 0.39Vcc < Vth < Vonrms = 0.5Vcc, that is, an on-driving voltage greater than the threshold voltage 'will necessarily control the display area to be on; and an on-driving voltage less than the threshold voltage' will control the display area to be off. It should be noted here that the above-mentioned preferred embodiment is based on the fact that the common selection signal and the common non-selection signal have a phase difference 'and is composed of two voltage levels (Vcc and GND), and the sector selection signal and sector The non-selective signal also has a phase difference, which is also described by the two voltage levels (Vcc and GND). However, those skilled in the art should know that the present invention is not limited to whether only the two voltage levels The composition, as long as the phase difference between the signals is used to generate a display driving voltage with a root mean square value greater than or less than a threshold voltage, is also one of the protection scope of the present invention. In addition, in the driving method of the display of the present invention, the common selection signal and the common non-selection signal are composed of only the first voltage level and the second voltage level, and the sector selection signal and the sector non-selection signal are composed only by the first voltage level. Three voltage levels and the fourth voltage level, even a special case where the first voltage level is equal to the third voltage level and the second voltage level is equal to the fourth voltage level. ) Method to calculate the waveforms of the common selection signal, the common non-selection signal, the segment selection signal, and the segment non-selection signal, and then combine them into a segment electrode signal and a common electrode signal 'to generate a root mean square value greater than or less than a threshold The driving voltage of the voltage to control the change of the display is also included in the spirit that the present invention does not use a multi-voltage level. In summary, the present invention uses the phase difference between the common selection SK signal and the common non-I Feng signal to generate a common combination of the common selection signal and the common non-selection signal. 5494 10494-PI-375 17 200414115 The electrode signal and the phase difference between the segment selection signal and the segment non-selection signal are used to generate the segment electrode signal which is a combination of the segment selection signal and the segment non-selection signal. The common electrode signal is used when the responsibility area is selected. And the phase difference between the segment electrode signals to generate a driving voltage whose root mean square is greater than or less than the threshold voltage, thereby controlling the change of the display area. Since the present invention does not require a bias voltage dividing circuit, it can not only simplify the driving circuit of the display, but also achieve the purpose of saving power. Although the present invention has been disclosed above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and retouches without departing from the spirit and scope of the present invention. The scope of protection of the invention shall be determined by the scope of the attached patent application. Brief description of the drawing: Figure 1A shows the schematic diagram of the operation principle of a TN LCD when no external voltage is applied; Figure 1B shows the schematic diagram of the operation principle of a TN LCD when an external voltage is applied; Figure 2 illustrates Figure 3A shows the relationship between the voltage applied to the TN LCD and the relative light transmittance. Figure 3A shows the display pattern achieved by a conventional LCD driving method. Figure 3B does not show Figure 3A. Waveform diagrams of the common selection signal, common non-selection signal, segment selection signal, segment non-selection signal, common electrode signal, and segment electrode signal in the display pattern; FIG. 4A shows the waveform according to the present invention. Waveform diagrams of the common selection signal, the common non-selection signal, the segment selection signal, and the segment non-selection signal of the driving method of the display 10494-PI-375 18 200414115 of a preferred embodiment; and FIG. Waveform diagrams of the common electrode signals (COM1-COM4) and the segment electrode signals of three different display data (1111, 0000, 1000) of the display driving method of a preferred embodiment of the present invention. Graphical description = 102: liquid crystal molecules 104, 106: glass substrate 10 8, 110: polarizing plate 30: display graphics 10494-PI-375 19

Claims (1)

200414115 Patent application scope 1. A display driving method, the display includes a common electrode and a segment electrode to control the change of a display area, the driving method includes the following steps: providing a common selection signal and a common non-selection Signal, the common selection signal is different from the common non-selection signal by a first phase difference, and a segment selection signal and a segment non-selection signal are provided, and the segment selection signal is different from the non-selection signal by a second phase. Poor; and combining the common selection signal and the common non-selection signal to generate a common electrode signal and providing it to the common electrode, and combining the sector selection signal and the sector non-selection signal to generate a sector electrode signal, And provided to the segment electrode to control the change of the display area. 2. The method for driving a display as described in item 1 of the scope of patent application, wherein the common electrode signal and the segment electrode signal include N responsibility areas within a unit time T, and the common electrode signal includes 1 responsibility The common selection signal of the area and the common non-selection signal of the N-1 responsibility areas. The 1 responsibility area using the common selection signal is called a selection responsibility area, and the other N-1 responsibility areas are called a non-selection responsibility area. ; When the display area is to be in an open state, the signal corresponding to the selection of the responsibility area among the electrode signals in the section is to be the section selection signal; when the display area is to be in an off state, the area is to be The signal in the segment electrode signal corresponding to the selection of the zone of responsibility is the non-selection signal in that segment. 3. The method for driving a display as described in item 2 of the scope of patent application, wherein when the display area is in the on state, an on-drive 10494-PI-375 20 200414115 voltage is defined, and when the display area is in the off state , Then define a turn-off drive voltage: Vonrms Ά [(Fc⑽Select-Select) 1 2 3 4 5 6 7 ± Γ + (Fc⑽Not Select-Select / Unselect) 2 Γ] V τ NN Voffrms 10494-PI-375 21 1 = Taxi (listen-selected-not-selected) 2 go to Γ + (F_not-selected-selected / not-selected) 2 2 V τ NN Vonrms: the turn-on driving voltage Voffrms: the turn-off driving voltage Vcom selection: the choice responsibility The common selection signal Vcom non-selection in the zone time: The common non-selection signal Vseg selection in the non-selection zone of responsibility: The section selection signal Vseg non-selection in the selection zone: Non-selection of the section when the responsibility zone is selected Selection signal Vseg selection / Vseg non-selection: The segment selection signal or the segment non-selection signal 3 in the non-selection responsibility area makes the on-drive voltage greater than a threshold voltage, and the off-drive voltage is less than the threshold voltage. 4 The method for driving a display as described in item 3 of the scope of patent application, wherein the phase difference between the segment selection signal and the common non-selection signal is equal to the phase difference between the segment non-selection signal and the common non-selection signal. 5 The method of driving a display as described in item 3 of the scope of patent application, wherein the non-selection signal in this section is in phase with the common selection signal. 6 The method for driving a display as described in item 1 of the scope of patent application, wherein the display is a liquid crystal display. 7 The method of driving a display device as described in item 6 of the patent application No. 200414115, wherein the liquid crystal display is a twisted nematic liquid crystal display. 8. A driving method for a display, the display including a common electrode and a segment electrode to control a change in a display area, the driving method includes the following steps: providing a common selection signal and a common non-selection signal, the common selection The signal and the common non-selection signal are only composed of a first voltage level and a second voltage level, and provide a segment selection signal and a segment non-selection signal. The segment selection signal and the segment non-selection signal. The signal is only composed of a third voltage level and a fourth voltage level; and the common selection signal and the common non-selection signal are combined to generate a common electrode signal and provided to the common electrode, and the section is combined The selection signal and the non-selection signal of the segment generate a segment electrode signal and provide the segment electrode to control the change of the display area. The common electrode signal and the segment electrode signal are within a unit time T. Both include N responsibility zones, and the common electrode signal includes a common selection signal of one responsibility zone and a common non-selection signal of N-1 responsibility zones, so that The 1 responsibility area of the common selection signal is referred to as a selection responsibility area, and the other N-1 responsibility areas are referred to as a non-selection responsibility area. When the display area is to be turned on, the electrode signal of the section is made. The signal corresponding to the selection of the zone of responsibility should be the signal for selecting the zone and an on-drive voltage should be defined. When the display area is to be in a closed state, the signal of the electrode of the zone should be the signal when the zone of responsibility should be selected. Unselect the signal for this section, and define a drive-off voltage: Vonrms 10494-PI-375 22 200414115 = ⑽Selected-Selected) 2 ^ Γ + (Fc ⑽Selected-Selected / Unselected) 2 Π Voffrms = Selected -Kwg Non-selected) 2 丄 Γ + (Kc⑽ Non-selected-Fwg selected / non-selected) 2 Γ] V Τ Ν Ν Vonrms: the on-driving voltage Voffrms: the off-driving voltage Vcom selection: the common selection signal when the responsibility area is selected Vcom non-selection: the common non-selection signal Vseg when the non-selection zone is selected: Vseg non-selection: the segment selection signal when the responsibility zone is selected Vseg non-selection signal / Vseg non-selection of the section when the responsibility zone is selected Select: The area when the non-selected area of responsibility The segment selection signal or the segment non-selection signal makes the on-driving voltage greater than a threshold voltage, and the off-driving voltage is less than the threshold voltage. 9. The method for driving a display according to item 8 of the scope of patent application, wherein the first voltage level is equal to the second voltage level, and the second voltage level is equal to the fourth voltage level. 10. The method for driving a display according to item 8 of the scope of patent application, wherein the display is a liquid crystal display. Π. The method for driving a display according to item 10 of the patent application, wherein the liquid crystal display is a twisted nematic liquid crystal display. 10494-PI-375 23