TWI398844B - Three color cholesterol liquid crystal digitized data voltage driving circuit and method thereof - Google Patents

Description

Three-color cholesterol liquid crystal digital data voltage driving circuit and method thereof

The invention relates to a driving circuit for a three-color cholesteric liquid crystal; in particular, to a digital driving circuit for a three-color cholesteric liquid crystal.

Cholesterol liquid crystal is a bistable liquid crystal material. When a voltage is applied to the liquid crystal, the liquid crystal will have different transmittance according to the applied voltage. When the application of the voltage is stopped, the liquid crystal can maintain the current state without returning to the original state, which has the advantage of power saving. The first figure is a schematic diagram of a conventional passive matrix three-color cholesteric liquid crystal display, which includes a display area 100, a scan driver 101 and a data driver 102. The display area 100 includes a plurality of red, green, and blue color liquid crystal cells 100R, 100G, and 100B. The scanning voltage driving circuit 101 and the data voltage driving circuit 102 respectively apply voltages to the upper and lower electrodes of the corresponding liquid crystal cells via the scanning lines and the data lines. Usually, the scanning voltage driving circuit 101 outputs a fixed voltage, and sequentially scans each column of liquid crystal cells, and the data voltage driving circuit 102 outputs a voltage required to display gray scales. The voltage difference between the output voltage of the scan voltage driving circuit 101 and the output voltage of the data voltage driving circuit 102 is the voltage across the liquid crystal cell, that is, the gray scale voltage. The second figure is a schematic diagram showing the characteristic conversion curve of the reflectance of the cholesteric liquid crystal material corresponding to the liquid crystal driving voltage (gray scale voltage). It can be seen from the figure that different colors of cholesteric liquid crystals display different driving voltages (gray scale voltage) intervals of gray scale, for example, the driving voltage range of the red cholesteric liquid crystal gray scale is 21-29 volts, and the green cholesteric liquid crystal gray scale is displayed. The driving voltage range is 23-31 volts, while the blue cholesteric liquid crystal gray scale shows a driving voltage range of 28-36 volts. Pass For the driving method of the passive matrix cholesteric liquid crystal display, as shown in the following Table 1, it lists the circuit driving conditions of the aforementioned conventional passive matrix three-color cholesteric liquid crystal display. When the blue cholesteric liquid crystal is used as a reference, the scanning voltage driving circuit 101 outputs a fixed voltage (scanning voltage) of 36 volts, in order to allow the gray scales of the red, green, and blue color liquid crystal cells 100R, 100G, and 100B to be When fully displayed, the data voltage driving circuit 102 must output a data voltage of 0-15 volts. However, according to the characteristic curve of the second figure, the red cholesterol liquid crystal cells 100R are between 36 volts and 29 volts, and the gray scale cannot be displayed; the green cholesterol liquid crystal cells 100G are between 36 volts to 31 volts and 23 volts to 21 volts. The gray scale cannot be displayed; the blue cholesterol liquid crystal cell 100B is between 28 volts and 21 volts, and the gray scale cannot be displayed. In addition, the conventional digital three-color cholesteric liquid crystal driving method is to modulate the high voltage action time of the output (the high voltage pulse width of the modulated output) to produce the desired gray scale. As shown in Table 1, in order to allow the red, green and blue cholesteric liquid crystals to completely display the gray scale, the scanning voltage driving circuit 101 outputs a fixed voltage of 36 volts, and the data voltage driving circuit 102 must output a low voltage of 0 volts. (Bright) or a high voltage of 15 volts (dark), and the gray scale is generated by modulating the pulse width of the aforementioned high voltage of 15 volts. However, according to the characteristic curve of the second figure, the red cholesterol liquid crystal cells 100R are between 36 volts and 29 volts, and the gray scale cannot be displayed; the green cholesterol liquid crystal cells 100G are between 36 volts to 31 volts and 23 volts to 21 volts. The gray scale cannot be displayed; the blue cholesterol liquid crystal cell 100B is between 28 volts and 21 volts, and the gray scale cannot be displayed. Therefore, the structure of the conventional liquid crystal display and the driving method thereof cause a driving voltage range in which each type of cholesteric liquid crystal is not used (the gray scale cannot be displayed), and some colors cannot be normally displayed.

The invention provides a digital data voltage driving circuit for a three-color cholesteric liquid crystal and a driving method thereof, which are characterized in that each of the color liquid crystal cells of different colors displays a gray data level, and an individual variable voltage width is applied. The individual high-potential voltage signals are applied to the corresponding different color liquid crystal cells, and the pulse widths of the respective high-potential voltage signals are modulated to change the light reflectance of the corresponding liquid crystal cells, so that the liquid crystal cells are required for display. Grayscale.

The invention provides a three-color cholesteric liquid crystal digital data voltage driving circuit, which comprises a digital signal input circuit, a pulse width modulator, a quasi-offset and at least one voltage boosting circuit. The digital signal input circuit receives the complex array digital signal data from the outside world. The pulse width modulator adjusts a pulse width of a predetermined potential voltage signal to a predetermined pulse width according to each of the set of digital signal data input to output the predetermined potential voltage signal or a zero potential having the predetermined pulse width. Voltage signal. The level shifter receives the predetermined potential voltage signal or the zero potential voltage signal having the predetermined pulse width, and the predetermined pulse is to be The predetermined potential voltage signal of the width is raised to a predetermined high potential voltage signal. The at least one voltage boosting circuit converts the predetermined high potential voltage signal into another high potential voltage signal having the predetermined pulse width, and converts the zero potential voltage signal into another low potential voltage signal, and then the predetermined The high potential voltage signal of the pulse width or the low potential voltage signal is applied to a corresponding liquid crystal.

The digital data voltage driving circuit of the foregoing three-color cholesteric liquid crystal of the invention can be applied to a passive matrix three-color cholesteric liquid crystal display and an active matrix three-color cholesteric liquid crystal display.

In another aspect, the present invention provides a digital three-color cholesteric liquid crystal data voltage driving method, which comprises providing a complex array of digital signal data; and modulating a pulse width of a predetermined potential voltage signal according to each of the set of digital signal data input thereto a predetermined pulse width for outputting the predetermined potential voltage signal or a zero potential voltage signal having the predetermined pulse width; raising the predetermined potential voltage signal to a predetermined high potential voltage signal having the predetermined pulse width; Converting the predetermined high-potential voltage signal of the pulse width into at least one high-potential voltage signal having the predetermined pulse width, and converting the zero-potential voltage signal into at least one low-potential voltage signal; and at least having the predetermined pulse width A high potential voltage signal or at least one low potential voltage signal is applied to at least one corresponding liquid crystal cell.

In the driving method of the present invention, the action time of the individual high-potential voltage signals applied to the liquid crystal cells of different colors is adjusted to change the light reflectance (in other words, the light transmittance) of the liquid crystal cells of different colors, thereby causing the liquid crystal cells to be displayed. The gray level required. The driving method of the present invention does not have a driving voltage that cannot display the gray scale, and acts on the liquid crystal cells, thereby enhancing the gray scale display.

The digital data voltage driving circuit of the three-color cholesteric liquid crystal provided by the invention provides a set of individual voltage sources for liquid crystal cells of different colors respectively. The individual voltage sources of the group include a high potential voltage signal and a low potential voltage signal. The high potential voltage signal provides a highest (dark) pixel data voltage corresponding to the liquid crystal cell, and the low potential voltage signal provides a lowest (bright) pixel data voltage corresponding to the liquid crystal cell. Referring to the eighth figure, the light reflectance of the red, green and blue cholesteric liquid crystal materials is relatively related to the voltage pulse width of the liquid crystal cell data electrode, wherein 100% represents the original voltage pulse width, and V% represents the voltage pulse width. It has been adjusted to V% of the original voltage pulse width. As can be seen from the eighth figure, when the value of the applied voltage applied to the liquid crystal cell data electrode is fixed, changing the pulse width (time of action) of the applied voltage changes the light reflectance of the liquid crystal cell, thereby changing the foregoing The gray scale display of the liquid crystal cell. According to the liquid crystal cell characteristic shown in the eighth figure, the present invention modulates the action time (pulse width) of the high-potential voltage signal according to the pixel data of the corresponding liquid crystal cell (gray-scale data) to change the corresponding liquid crystal. The light reflectivity of the cell, which in turn causes the liquid crystal cell to display the desired gray level. The writing time of the aforementioned pixel data (grayscale data) is determined by a set of corresponding digital signal data input to the digital data voltage driving circuit of the three-color cholesteric liquid crystal of the present invention. Hereinafter, the digital data voltage driving circuit of the three-color cholesteric liquid crystal of the present invention will be described in detail by way of a specific embodiment in conjunction with the accompanying drawings.

The third figure is a functional block diagram of a circuit architecture of a specific embodiment of the digital data voltage driving circuit of the three-color cholesteric liquid crystal of the present invention. In this embodiment, the digital data voltage driving circuit 40 of the three-color cholesteric liquid crystal of the present invention comprises a digital signal input circuit 401, a PWM generator 402, and a quasi-offset (Level). -Shifter) 403, a red liquid crystal voltage raising circuit 404R, a green liquid crystal voltage raising circuit 404G, and a blue liquid crystal voltage raising circuit 404B. The digital signal input circuit 401 receives the complex array digital signal data input from the outside world. After the digital signal input circuit 401 receives the aforementioned set of digital signal data, the set of digital signal data is output to the pulse width modulator 402. The pulse width modulator 402 modulates the pulse width of a predetermined potential voltage signal generated by the digital signal data to a predetermined pulse width to output the predetermined potential voltage signal or the predetermined pulse width. Zero potential voltage signal. For example, when the digital signal input circuit 401 receives a set of digital signal data (010) from the outside, the set of digital signal data (010) is sent to the pulse width modulator 402. The pulse width modulator 402 adjusts the pulse width of a 3.3 volt voltage signal generated by itself according to the set of digital signal data (010) to, for example, 0x2 ⁰ +1x2 ¹ +0x2 ² nanometers (ns), that is, the 3.3 The volt voltage signal is adjusted to a 3.3 volt signal with a pulse width of 2 nanometers (ns). In this case, the pulse width modulator 402 sends a 3.3 volt voltage signal having a pulse width of 2 nanometers (ns) to the level shifter 403. When the digital signal input circuit 401 receives a set of digital signal data from the outside as (000), the digital signal input circuit 401 sends the set of digital signal data (000) to the pulse width modulator 402. The pulse width modulator 402 adjusts the pulse width of the 3.3 volt voltage signal to 0x2 ⁰ +0x2 ¹ +0x2 ² nanometers (ns) according to the set of digital signal data (000), that is, the 3.3 volt voltage signal is adjusted to a pulse. The width is 0 nanometers (ns). In this case, the pulse width modulator 402 is equivalent to (ie) sending a zero potential voltage signal to the level shifter 403. According to the above, the level shifter 403 is configured to raise the predetermined potential voltage signal having the predetermined pulse width to a predetermined high potential voltage signal having the predetermined pulse width. The red liquid crystal voltage raising circuit 404R converts the predetermined high potential voltage signal having the predetermined pulse width into a first high potential voltage signal V _{RH having} the predetermined pulse width, and converts the zero potential voltage signal into a first The low potential voltage signal V _RL and the first high potential voltage signal V _RH or the first low potential voltage signal V _{RL having} the predetermined pulse width is applied as an output voltage signal V _{OR to} the data electrode of the red liquid crystal cell. The green liquid crystal voltage raising circuit 404G converts the predetermined high potential voltage signal having the predetermined pulse width into a second high potential voltage signal V _{GH having} the predetermined pulse width, and converts the zero potential voltage signal into a second The low potential voltage signal V _GL , and the second high potential voltage signal V _GH or the second low potential voltage signal V _{GL having} the predetermined pulse width is applied as an output voltage signal V _{OG to} the data electrode of the green liquid crystal cell. The blue liquid crystal voltage raising circuit 404B converts the predetermined high potential voltage signal having the predetermined pulse width into a third high potential voltage signal V _{BH having} the predetermined pulse width, and converts the zero potential voltage signal into a first a three low potential voltage signal V _BL , and a third high potential voltage signal V _BH or a third low potential voltage signal V _{BL having} the predetermined pulse width is used as an output voltage signal V _{OB to be} applied to the blue liquid crystal cell electrode.

The digital data voltage driving circuit 40 of the above-mentioned three-color cholesteric liquid crystal of the present invention can output an individual set of voltage signals to the red, green and blue cholesterol liquid crystal cells. Each set of voltage signals contains a different low-potential voltage signal (V _RL , V _GL , V _BL ) and a high-potential voltage signal (V _RH , V _GH , V _BH ) with a predetermined pulse width. When the bright pixel data is written to the corresponding liquid crystal cell, the corresponding liquid crystal cell voltage raising circuit (404R, 404G, 404B) outputs the low potential voltage signal (V _RL , V _GL , V _BL ) to the corresponding liquid crystal cell. Data electrode. When the gray scale pixel data is written to the corresponding liquid crystal cell, the corresponding liquid crystal cell voltage raising circuit (404R, 404G, 404B) outputs the high potential voltage signal (V _RH , V _GH , V _BH ) having a predetermined pulse width. And the predetermined pulse width is determined according to a set of corresponding digital signal data input to the digital data voltage driving circuit 40. The corresponding digital signal data of the group is related to the gray data data writing time. Referring to the eighth figure, the pulse width of the high-potential voltage signal (V _RH , V _GH , V _BH ) is modulated according to the input set of corresponding digital signal data to change the light reflectivity of the corresponding liquid crystal cell, and thus the foregoing Gray scale data is written to the corresponding liquid crystal cell.

The fourth to fourth C diagrams illustrate the operation mode of the three-color data voltage driving circuit 40 for the three-color cholesteric liquid crystal output for three different voltage sources for the red, green and blue cholesteric liquid crystals. Referring to FIG. 4A, the pulse width modulator 402 outputs a 0 volt voltage signal or a 3.3 volt voltage signal of a predetermined pulse width according to the digital signal input circuit 401 outputting a set of digital signal data. The level shifter 403 raises the high potential voltage signal 3.3 volts to a high potential voltage of 15 volts while maintaining the low potential voltage of 0 volts. The set of high and low potential voltage signals are 0 volts and 15 volts respectively after voltage boosting and are sent to the red liquid crystal voltage raising circuit 404R, and the red liquid crystal voltage raising circuit 404R converts the low potential voltage 0 volts into a low potential. The voltage is 7 volts, and the aforementioned high potential voltage of 15 volts is converted to a high potential voltage of 15 volts. The fifth to fifth C diagrams show the simulation results of the aforementioned circuit architecture of the present invention. Referring to FIG. 4B, the pulse width modulator 402 outputs a 0 volt voltage signal or a 3.3 volt voltage signal of a predetermined pulse width according to the set of digital signal data output by the digital signal input circuit 401. The level shifter 403 raises the high potential voltage signal 3.3 volts to a high potential voltage of 15 volts while maintaining the low potential voltage of 0 volts. The set of high and low potential voltage signals are 0 volts and 15 volts respectively after voltage boosting and are sent to the green liquid crystal voltage raising circuit 404G, and the green liquid crystal voltage raising circuit 404G converts the low potential voltage 0 volts into a low potential. The voltage is 5 volts, and the aforementioned high potential voltage of 15 volts is converted into a high potential voltage of 13 volts. Sixth A to Sixth The C diagram shows the simulation results of the aforementioned circuit architecture of the present invention. Referring to FIG. 4C, the pulse width modulator 402 outputs a 0 volt voltage signal or a 3.3 volt voltage signal of a predetermined pulse width according to the set of digital signal data output by the digital signal input circuit 401. The level shifter 403 raises the high potential voltage signal 3.3 volts to a high potential voltage of 15 volts while maintaining the low potential voltage of 0 volts. The set of high and low potential voltage signals are 0 volts and 15 volts respectively after the voltage is raised and sent to the blue liquid crystal voltage raising circuit 404B, and the blue liquid crystal voltage raising circuit 404B converts the low potential voltage 0 volts into The low potential voltage is 0 volts, and the aforementioned high potential voltage of 15 volts is converted into a high potential voltage of 8 volts. The seventh to seventh C drawings show the simulation results of the aforementioned circuit architecture of the present invention.

In this way, the digital data voltage driving circuit 40 of the three-color cholesteric liquid crystal of the present invention can provide a set of voltage signals (7 volts, 15 volts) to the data electrodes of the corresponding red liquid crystal cells, and provide a set of voltage signals (5). Volts, 13 volts) to the data electrode of the corresponding green liquid crystal cell, and a set of voltage signals (0 volts, 8 volts) to the data electrode of the corresponding blue liquid crystal cell. The ninth figure is a timing diagram illustrating the aforementioned individual voltage signals provided by the digital data voltage driving circuit 40 of the three-color cholesteric liquid crystal according to the present invention for the red, green and blue cholesterol liquid crystal cells.

Table 2 below shows the circuit driving conditions of the digital data voltage driving circuit of the third-color three-color cholesteric liquid crystal. In the case of red cholesteric liquid crystal, since the driving voltage operating voltage range is 21 volts to 29 volts, when the scanning voltage is set to 36 volts, the voltage of the data voltage driving circuit can be set to 7 volts to 15 volts; The voltage of the green cholesteric liquid crystal voltage driving circuit can be set to 5 volts to 13 volts, and the voltage of the blue cholesteric liquid crystal data driving circuit can be set to 0 volts to 8 volts. According to the above, the digital color of the three-color cholesteric liquid crystal of the present invention The material voltage driving circuit 40 can realize the driving condition of the circuit, and the driving voltage that cannot display the gray level acts on the red, green, and blue liquid crystal cells, thereby enlarging the gray scale display.

Furthermore, as shown in Table 2, the digital voltage data driving circuit 40 of the three-color cholesteric liquid crystal of the present invention supplies the data voltage of the red cholesteric liquid crystal to 7 volts (bright pixel data) and 15 volts (dark pixel data). The data voltage supplied to the green cholesterol liquid crystal is 5 volts (bright pixel data) and 13 volts (dark pixel data), and the data voltage supplied to the blue cholesteric liquid crystal is 0 volt (bright pixel data) and 8 volts. (dark picture material).

The digital data voltage driving circuit 40 of the three-color cholesteric liquid crystal of the present invention can be applied to a passive matrix three-color cholesteric liquid crystal display, as shown in the tenth figure. The passive matrix trichromatic cholesteric liquid crystal display mainly comprises the digital data voltage driving circuit 40, a scanning voltage driving circuit 42 and a display area 50. The display area 50 includes a plurality of columns of red cholesterol liquid crystal cells, a plurality of columns of green cholesterol liquid crystal cells, and a plurality of columns of blue cholesterol liquid crystal cells; each column of red cholesterol liquid crystal cells comprises a plurality of red liquid crystal cells. 50R, and each column of green cholesterol liquid crystal cells comprise a plurality of green liquid crystal cells 50G, and each column of blue cholesterol liquid crystal cells comprises a plurality of blue liquid crystal cells 50B. Each column of red cholesterol liquid crystal cells and each column of green cholesterol liquid crystal cells and each column of blue cholesterol liquid crystal cells are arranged in a vertical direction and staggered in a horizontal direction. The scan voltage driving circuit 42 includes a plurality of scan lines sequentially providing a fixed scan voltage to a corresponding one of the scan electrodes of the liquid crystal cell. As described in the foregoing embodiment, the digital data voltage driving circuit 40 applies an individual voltage signal to the corresponding data electrodes of the liquid crystal cells of the different colors, wherein the individual voltage signals are individually high in predetermined pulse width. a potential voltage signal or an individual low potential voltage signal, the predetermined pulse width is determined according to a set of corresponding digital signal data input to the digital data voltage driving circuit 40, and is related to the data voltage writing time of the liquid crystal cells .

On the other hand, the digital data voltage driving circuit 40 of the three-color cholesteric liquid crystal of the present invention can be applied to an active matrix three-color cholesteric liquid crystal display, as shown in FIG. The active matrix trichromatic cholesteric liquid crystal display mainly comprises the digital data voltage driving circuit 40, a scanning voltage driving circuit 62 and a display area 60. The display area 60 comprises a plurality of columns of red cholesterol liquid crystal cells, a plurality of columns of green cholesterol liquid crystal cells and a plurality of columns of blue cholesterol liquid crystal cells; each column of red cholesterol liquid crystal cells comprises a plurality of red liquid crystal cells 60R, and each column of green cholesterol liquid crystal cells comprises plural Each of the green liquid crystal cells 60G, and each column of blue cholesterol liquid crystal cells contains a plurality of blue liquid crystal cells 60B. Each column of red cholesterol liquid crystal cells and each column of green cholesterol liquid crystal cells and each column of blue cholesterol liquid crystal cells are arranged in a vertical direction and staggered in a horizontal direction. The different color of the cholesterol liquid crystal cells have a common data electrode 600 coupled to a low voltage source such as a ground and respectively have a high potential data electrode coupled to the digital data A data line of the voltage driving circuit 40. The scan voltage driving circuit 62 includes a plurality of scan lines sequentially providing a scan voltage to a corresponding one of the scan electrodes of the liquid crystal cell. The digital data voltage driving circuit 40 applies an individual voltage signal to the high potential data electrodes of the liquid crystal cells of the different colors, wherein the individual voltage signals are individual predetermined pulse width high potential voltage signals or The predetermined low pulse voltage is determined according to a set of corresponding digital signal data input to the digital data voltage driving circuit 40, and is determined according to the data voltage writing time of the liquid crystal cells.

The above description is only for the specific embodiments of the present invention, and is not intended to limit the scope of the claims of the present invention; all other equivalent changes or modifications which are not departing from the spirit of the present invention should be included in the following Within the scope of the patent application.

40‧‧‧Digital data voltage drive circuit

50, 60, 100‧‧‧ display area

42, 62, 101‧‧‧ scan voltage drive circuit

50R, 60R, 100R‧‧‧ red liquid crystal cell

50G, 60G, 100G‧‧‧ green liquid crystal cell

50B, 60B, 100B‧‧‧ blue liquid crystal cell

102‧‧‧Data voltage drive circuit

600‧‧‧Common data electrode

401‧‧‧Digital signal input circuit

402‧‧‧ pulse width modulator

403‧‧‧ position shifter

The first figure is a schematic diagram of a conventional passive matrix three-color cholesterol liquid crystal display; the second figure is a schematic diagram of the characteristic conversion curve of the reflectivity of the cholesteric liquid crystal material corresponding to the liquid crystal driving voltage (gray scale voltage); the third figure is the digital position of the present invention A schematic diagram of a circuit architecture function of a specific embodiment of a voltage driving circuit; and a fourth to fourth C diagrams schematically illustrating the operation mode of the digital voltage driving circuit of the third figure; fifth to fifth C FIG. 6A to 6C and 7A to 7C show circuit simulation results of the digital voltage driving circuit of the third figure; the eighth figure is the liquid crystal material of red, green and blue cholesterol. Schematic diagram of the relationship between the light reflectivity and the voltage pulse width of the liquid crystal cell data electrode; the ninth figure is a timing diagram illustrating the digital voltage signals of each group of the digital data voltage driving circuit outputted by the third figure; A schematic plan view of a passive matrix three-color cholesteric liquid crystal display; and an eleventh figure showing a schematic view of the active matrix three-color cholesteric liquid crystal display of the present invention Figure.

40‧‧‧Digital data voltage drive circuit

401‧‧‧Digital signal input circuit

402‧‧‧ pulse width modulator

403‧‧‧ position shifter

404R‧‧‧Red LCD voltage boost circuit

404G‧‧‧Green LCD voltage boost circuit

404B‧‧‧Blue LCD voltage boost circuit

Claims (15)

A digital data voltage driving circuit for a three-color cholesteric liquid crystal, comprising: a digital signal input circuit for receiving a complex array of digital signal data from the outside; a pulse width modulator, each of the group of digital signals according to the input Transmitting a pulse width of a predetermined potential voltage signal to a predetermined pulse width, so that the pulse width modulator outputs a predetermined potential voltage signal or a zero potential voltage signal having the predetermined pulse width; Receiving the predetermined potential voltage signal or the zero potential voltage signal having the predetermined pulse width, and raising the predetermined potential voltage signal having the predetermined pulse width to a predetermined high potential voltage signal; and at least one voltage raising circuit And converting the predetermined high-potential voltage signal into another high-potential voltage signal having the predetermined pulse width, and converting the zero-potential voltage signal into another low-potential voltage signal. The digital data voltage driving circuit of claim 1, wherein the voltage raising circuit comprises a first color liquid crystal voltage raising circuit, a second color liquid crystal voltage raising circuit and a third color liquid crystal voltage raising circuit. The digital data voltage driving circuit of claim 2, wherein the first color liquid crystal voltage raising circuit converts the predetermined high potential voltage signal into a first high potential voltage signal having the predetermined pulse width, and Converting the zero potential voltage signal into a first low potential voltage signal; the second color liquid crystal voltage raising circuit converting the predetermined high potential voltage signal into a second high potential voltage signal having the predetermined pulse width, and the zero Converting the potential voltage signal into a second low potential voltage signal; and The third color liquid crystal voltage raising circuit converts the predetermined high potential voltage signal into a third high potential voltage signal having the predetermined pulse width, and converts the zero potential voltage signal into a third low potential voltage signal. The digital data voltage driving circuit according to claim 1, wherein the pulse width modulator adjusts a pulse width of the predetermined potential voltage signal to change a transmittance of the cholesteric liquid crystal. A digital three-color cholesteric liquid crystal data voltage driving method, comprising: providing a complex array of digital signal data; and modulating a pulse width of a predetermined potential voltage signal to a predetermined pulse width according to each of the group of digital signal data input thereto Outputting the predetermined potential voltage signal or a zero potential voltage signal having the predetermined pulse width; raising the predetermined potential voltage signal to a predetermined high potential voltage signal having the predetermined pulse width; and having the predetermined pulse width Converting the high potential voltage signal into at least one high potential voltage signal having the predetermined pulse width, and converting the zero potential voltage signal into at least one low potential voltage signal; and the high potential voltage signal having the predetermined pulse width or the The low potential voltage signal is applied to a corresponding liquid crystal cell. The digital three-color cholesteric liquid crystal data voltage driving method according to claim 5, wherein the predetermined high-potential voltage signal having the predetermined pulse width is respectively converted into a first high-potential voltage having the predetermined pulse width. a signal, a second high potential voltage signal and a third high potential voltage signal, and converting the zero potential voltage signal into a first low potential voltage signal, a second low potential voltage signal and a third low potential voltage signal; The first high potential voltage signal or the first low potential voltage signal having the predetermined pulse width is applied to a corresponding first color liquid crystal cell, and The second high potential voltage signal or the second low potential voltage signal of the predetermined pulse width is applied to a corresponding second color liquid crystal cell, and the third high potential voltage signal or the third portion having the predetermined pulse width The low potential voltage signal is applied to a corresponding third color liquid crystal cell. For example, the digital three-color cholesteric liquid crystal data voltage driving method described in claim 5, wherein the pulse width of the predetermined potential voltage signal is changed to change the transmittance of the cholesteric liquid crystal. A passive matrix three-color cholesterol liquid crystal display comprises: a display area comprising a plurality of columns of first color cholesterol liquid crystal cells, a plurality of columns of second color cholesterol liquid crystal cells and a plurality of columns of third color cholesterol liquid crystal cells, each column of the first color The cholesterol liquid crystal cell comprises a plurality of liquid crystal cells, and each column of the second color cholesterol liquid crystal cells comprises a plurality of liquid crystal cells, and each column of the third color cholesterol liquid crystal cells comprises a plurality of liquid crystal cells, wherein each column of the first color cholesterol liquid crystal cells and each a column of second color cholesteric liquid crystal cells and each column of third color cholesteric liquid crystal cells are arranged in a vertical direction and staggered in a horizontal direction; a scanning voltage driving circuit includes a plurality of scanning lines sequentially providing a scanning voltage to a corresponding column a scanning electrode of the liquid crystal cell; and a digital data voltage driving circuit for applying an individual voltage signal to the data electrode of the liquid crystal cell of the different color, wherein the individual voltage signals are individual with a predetermined pulse width Potential voltage signal or individual low battery Voltage signal, the predetermined pulse width of the input lines by bit digital data corresponding to a voltage drive circuit digital signal data set may be. The passive matrix three-color cholesteric liquid crystal display of claim 8, wherein the digital data voltage driving circuit comprises: a digital signal input circuit for receiving the set of digital signal data from the outside; a pulse width modulator that modulates a pulse width of a predetermined potential voltage signal to a predetermined pulse width according to the input digital signal data to output the predetermined potential voltage signal or a zero potential voltage having the predetermined pulse width a quasi-offset that receives the predetermined potential voltage signal or the zero potential voltage signal having the predetermined pulse width, and raises the predetermined potential voltage signal having the predetermined pulse width to a predetermined high potential voltage signal And at least one voltage boosting circuit converts the predetermined high-potential voltage signal into another high-potential voltage signal having the predetermined pulse width, and converts the zero-potential voltage signal into another low-potential voltage signal. The passive matrix trichrome liquid crystal display of claim 9, wherein the voltage boosting circuit comprises a first color liquid crystal voltage raising circuit, a second color liquid crystal voltage raising circuit and a third color liquid crystal voltage raising circuit. . The passive matrix three-color cholesteric liquid crystal display of claim 10, wherein the first color liquid crystal voltage raising circuit converts the predetermined high-potential voltage signal into a first high-potential voltage signal having the predetermined pulse width, And converting the zero potential voltage signal into a first low potential voltage signal; the second color liquid crystal voltage raising circuit converting the predetermined high potential voltage signal into a second high potential voltage signal having the predetermined pulse width, and Converting the zero potential voltage signal into a second low potential voltage signal; and a third color liquid crystal voltage raising circuit converting the predetermined high potential voltage signal into a third high potential voltage signal having the predetermined pulse width, and the zero potential The voltage signal is converted into a third low potential voltage signal. An active matrix trichrome liquid crystal display comprising: a display area comprising a plurality of first color cholesterol liquid crystal cells, a plurality of second color cholesterol liquid crystal cells, and a plurality of third color cholesterol liquid crystal cells, each column of the first color cholesterol liquid crystal cells comprising a plurality of liquid crystal cells, and each column The second color cholesterol liquid crystal cell comprises a plurality of liquid crystal cells, and each column of the third color cholesterol liquid crystal cell comprises a plurality of liquid crystal cells, wherein each column of the first color cholesterol liquid crystal cell and each column of the second color cholesterol liquid crystal cell and each column third The color cholesteric liquid crystal cells are arranged in a vertical direction and staggered in a horizontal direction. The different color cholesteric liquid crystal cells have a common data electrode coupled to a low voltage source and respectively have a high potential data electrode; a scan voltage drive The circuit includes a plurality of scan lines sequentially providing a scan voltage to a corresponding one of the scan electrodes of the liquid crystal cell; and a digital data voltage driving circuit for applying individual voltage signals to the corresponding liquid crystal cells of different colors Such high potential data electrodes, wherein the aforementioned individual Voltage signal pulse width predetermined high potential voltage signal or a low potential voltage signal individual to individual with the system in accordance with a predetermined pulse width corresponding to a set input of the digital type data voltage driver circuit and a digital signal data set. The active matrix three-color cholesteric liquid crystal display of claim 12, wherein the digital data voltage driving circuit comprises: a digital signal input circuit for receiving the set of digital signal data from the outside; a pulse width modulation The transformer adjusts a pulse width of a predetermined potential voltage signal to a predetermined pulse width according to the input digital signal data of the group to output the predetermined potential voltage signal or a zero potential voltage signal having the predetermined pulse width; a quasi-offset that receives the predetermined electric power having the predetermined pulse width a potential voltage signal or the zero potential voltage signal, and raising the predetermined potential voltage signal having the predetermined pulse width to a predetermined high potential voltage signal; and at least one voltage raising circuit converting the predetermined high potential voltage signal into a The other high potential voltage signal of the predetermined pulse width converts the zero potential voltage signal into another low potential voltage signal. The active matrix trichromatic cholesteric liquid crystal display of claim 13, wherein the voltage boosting circuit comprises a first color liquid crystal voltage raising circuit, a second color liquid crystal voltage raising circuit and a third color liquid crystal voltage raising Circuit. The active matrix trichromatic cholesteric liquid crystal display of claim 14, wherein the first color liquid crystal voltage raising circuit converts the predetermined high potential voltage signal into a first high potential voltage signal having the predetermined pulse width. And converting the zero potential voltage signal into a first low potential voltage signal; the second color liquid crystal voltage raising circuit converting the predetermined high potential voltage signal into a second high potential voltage signal having the predetermined pulse width, and Converting the zero potential voltage signal into a second low potential voltage signal; and a third color liquid crystal voltage raising circuit converting the predetermined high potential voltage signal into a third high potential voltage signal having the predetermined pulse width, and the zero The potential voltage signal is converted into a third low potential voltage signal.