CA2243383C - Method for driving a nematic liquid crystal - Google Patents

Method for driving a nematic liquid crystal Download PDF

Info

Publication number
CA2243383C
CA2243383C CA2243383A CA2243383A CA2243383C CA 2243383 C CA2243383 C CA 2243383C CA 2243383 A CA2243383 A CA 2243383A CA 2243383 A CA2243383 A CA 2243383A CA 2243383 C CA2243383 C CA 2243383C
Authority
CA
Canada
Prior art keywords
liquid crystal
display device
electrodes
nematic liquid
crystal display
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CA2243383A
Other languages
French (fr)
Other versions
CA2243383A1 (en
Inventor
Masaya Okita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2243383A1 publication Critical patent/CA2243383A1/en
Application granted granted Critical
Publication of CA2243383C publication Critical patent/CA2243383C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
    • G09G3/16—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions by control of light from an independent source
    • G09G3/18—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/06—Details of flat display driving waveforms
    • G09G2310/065—Waveforms comprising zero voltage phase or pause
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3622—Control of matrices with row and column drivers using a passive matrix

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Substances (AREA)

Abstract

In a liquid crystal display device combining a nematic liquid crystal confined between two electrodes with polarizing plates, a voltage applied between two electrodes to drive the nematic liquid crystal is maintained in a predetermined value for a predetermined duration of time in predetermined intervals to increase the response speed and to realize color images by tricolor back-lighting or moving images equivalent to or more excellent than those by CRT
displays.

Description

METHOD FOR DRIVING A NEMATIC LIQUID CRYSTAL
BACKGROUND OF THE INVENTION
Field of the Invention This invention relates to a method for driving a liquid crystal, especially, a nematic liquid crystal.
Description of the Related Art When two transparent flat plates having transparent electrodes and sandwiching a nematic liquid crystal are placed between two polarizing plates, transmittance of light passing through the polarizing plates changes with the voltage applied across the transparent electrodes.

Since liquid crystal display devices based on the above principle can be shaped flat and are operative with low electric power, they have been widely used in wrist watches, electronic calculating machines, and so forth.
In recent years, they are also used in combination with color filters to form color display devices in note-type personal computers and small liquid crystal TV sets, for example.
A problem with conventional liquid crystal display devices is slow responses of liquid crystals. In this respect, liquid crystal display devices have been inferior to CRT displays especially when used as TV displays for displaying moving images or as personal computer displays required to quickly follow the movements of a mouse cursor.
In liquid crystal displays combined with color filters to display color images, three dots of different colors, namely, red, green and blue, are combined to display a desired color. A problem with the use of color filters lies in that color filters are very expensive and need a high accuracy when bonded to panels. Moreover, they need a triple number of dots to ensure an equivalent resolution as compared wit h black-and-white liquid crystal display panels.
Therefore, typical liquid crystal color panels require a triple number of drive circuits in the horizontal direction.
This means an increase of the cost of drive circuits themselves and the cost for an increased man-hour for connecting drive circuits to the panel at a triple number of points.

Another problem with the use of color filters is their optical transmittance as low as 20% approximately. When color filters are used in a liquid crystal panel, the brightness decreases to approximately one fifth, and a large electric power is consumed for back-lighting to compensate the brightness.

Thus, the use of color filters with liquid crystal panels to display color images involved many disadvantageous factors from the economical viewpoint, and it was difficult to manufacture an economical liquid crystal panel for color images using this method.

Japanese Patent Laid-Open 1-179914 (1989) discloses a color liquid crystal display device to display color images by combining a black-and-white panel and tricolor back-lighting instead of using color filters. This method certainly appears more likely to realize high-fidelity color images inexpensively. Practically, however, response speeds of nematic liquid crystals by conventional liquid crystal driving methods are as slow as several decades of milliseconds through hundreds of milliseconds, and it has been believed difficult to realize a response speed not slower than 8 milliseconds required for color images by tricolor back-lighting with a liquid crystal panel using a nematic liquid crystal.

There are also some proposals to use ferroelectric liquid crystals or antiferroelectric liquid crystals to provide liquid crystal panels operative at a high speed.
However, no such device has been brought into practice mainly because the cell gaps of the liquid crystal must be as small as 1 am and are difficult to make.

SUI IARY OF THE INVENTION
It is therefore an object of the invention to provide a nematic liquid crystal driving method which increases the response speed of any conventional nematic liquid crystal, either of the TN type or of the STN type, to enable coloring by tricolor back-lighting and to ensure the performance equivalent to or higher than CRT displays in reproduction of moving images.
The Inventor measured dynamic characteristics of applied voltage waveforms and optical transmittance of nematic liquid crystals to develop a liquid crystal panel having a response speed enabling color images by tricolor back-lighting, and has confirmed that, depending on the waveform of the applied voltage, there occurs the phenomenon that the optical transmittance changes very quickly in response to changes in applied voltage. If this phenomenon is repetitively produced, it must be possible to increase the response speed of the liquid crystal. The present invention is based on the above knowledge of the Inventor, and its basic concept lies in increasing the response speed of a liquid crystal by applying a voltage to the liquid crystal at a unique timing different from those of conventional driving circuits.
That is, according to the invention, there is provided a method for driving a nematic liquid crystal in a liquid crystal display device which includes a nematic liquid crystal, two electrodes confining the nematic liquid crystal and a pair of polarizing plates sandwiching the electrodes confining the nematic liquid crystal, comprising:
the voltage applied across two electrodes being returned to and maintained in a predetermined value for a predetermined duration of time in predetermined intervals.
In the duration of time other than the predetermined duration of time in each interval, the voltage applied across two electrodes may be inverted in polarity.
The nematic liquid crystal may be heated to a predetermined temperature.
According to the invention, by returning or maintaining the voltage across two electrodes to or in a predetermined value for a predetermined time in predetermined intervals, the liquid can be driven at a much higher response speed than those of conventional driving methods. Therefore, a liquid crystal panel suitable for color images by tri-color back-lighting and for moving images with a high contrast ratio can be realized. It is also possible to reduce the power consumption.
Generally speaking, the present invention provides a method for driving a nematic liquid crystal in a liquid crystal display device which includes the nematic liquid crystal, two electrodes confining the nematic liquid crystal and a pair of polarizing plates sandwiching the electrodes and the nematic liquid crystal, characterized in:
applying a voltage corresponding to image data between the two electrodes and thereby displaying an image on a liquid crystal panel of the display device; and applying a constant voltage between the two electrodes in each frame period and thereby erasing the image displayed on the panel within the same frame period.

BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a diagram showing the waveform of voltages applied to a nematic liquid crystal by a nematic liquid crystal driving method according to an embodiment of the invention, together with absolute values of the voltages and responsive changes with time in optical transmittance of the nematic liquid crystal; and 4a Fig. 2 is a diagram showing the waveform of voltages applied to a nematic liquid crystal by a conventional driving method, together with absolute values of the voltages and responsive changes with time in optical transmittance of the nematic liquid crystal.

DESCRIPTION OF THE PREFERRED EMBODIMENT

Explained below is an embodiment of the invention with reference to the drawings.
Fig. 1 shows an aspect where a voltage is applied to a high-speed nematic liquid crystal panel using appropriate one of conventional TN liquid crystals or STN liquid crystals and optimizing the cell gap. Further, intervals, Ti through T6, are equal in length, and the length is not longer than 8 milliseconds which is the slowest acceptable driving cycle required for driving a liquid crystal for color images by tricolor back-lighting.
As already known, optical transmittance of a liquid crystal changes with absolute values of applied voltages regardless of their polarities. However, the applied voltage is usually changed in polarity in predetermined intervals because continuous application of a d.c. voltage to a liquid crystal will cause an electro-chemical reaction and will deteriorate the liquid crystal. Therefore, also in the embodiment of the invention, applied voltages are inverted in polarity. However, inversion of polarities is substantially immaterial to the subject matter of the invention, namely, high-speed driving of a liquid crystal. Now explained below is the operation of the embodiment of the invention with reference to the drawings.

In Fig. 1 showing the driving method according to the embodiment of the invention, each of the intervals of time T1 through T6 includes two time zones. One of these time zones (the former of each of Ti through T6 in Fig. 1) is the time where a voltage responsive to image data is applied, and the absolute value represents V1 or OV depending upon the image data. The other time zone (the latter of each of Ti through T6) is the time where the voltage of OV is applied irrespectively of the image data. That is, in the present embodiment, the applied voltage is forcibly changed to or maintained in OV for a predetermined time in predetermined intervals.
More specifically, in the interval T3 and the interval T5 in Fig. 1, also the applied voltage responsive to image data is OV, and the optical transmittance maintains the black level throughout the intervals. In each of the intervals T1, T2, T4 and T6, the applied voltage first becomes V1 in response to image data, and is forcibly changed to OV later.
Responsively, the optical transmittance first changes from the black level to the white level and then changes from the white level to the black level. That is, the optical transmittance changes from the black level to the white level, and returns from the black level to the white level within each interval, T1, T2, T4 or T6.

For a better understanding of the embodiment of the invention, a conventional driving method is explained below with reference to Fig. 2. Fig. 2 shows an aspect where a voltage is applied by using the same nematic liquid crystal panel as used in Fig. 1, and the same image data is supplied.
Also the intervals T1 through T6 are the same as those of Fig. 1.

As shown in Fig. 2, in the conventional driving method, the applied voltage is determined exclusively by image data.
Therefore, the absolute value of the applied voltage becomes V2 or OV, depending upon the image data to be displayed, but the value is maintained throughout the interval, or beyond the interval, until an image data is changed to the next image data. In this case, the movement of the liquid crystal is slow, and it takes time for the optical transmittance to change. For example, even when the absolute of the applied voltage changes from V2 to OV, like T2 to T3 in Fig. 2, the optical transmittance does not change the full black level within the interval T3. Further, when the absolute value of the applied voltage changes from OV to V2 like T3 to T4 in Fig. 2, the optical transmittance begins to change from an incomplete black level toward the full black level, but fails to return to the full white level within the interval Ti.
That is, the response speed of the liquid by the conventional driving method is slow, and high-contrast images cannot be displayed at a sufficient speed either on a TN liquid crystal panel or on a STN liquid crystal panel.
It will be understood from comparison of Fig. 1 and Fig. 2 that the embodiment can change the optical transmittance from the black level to the white level or vice versa more quickly by changing the applied voltage to OV for a predetermined time in predetermined intervals.

Additionally, the embodiment can use a higher applied voltage V1 than V2 of the conventional method to change the optical transmittance to the white level. This is effective for more quickly changing the optical transmittance from the black level to the white level.
Consequently, the embodiment of the invention invert the polarity within each interval (Ti through T6) so that the average voltage becomes substantially OV in each interval (Ti to T6). Since the liquid crystal moves very quickly, if the polarity is inverted between two adjacent intervals (for example, if the polarity in the interval Ti is positive, the polarity is changed to negative in the interval Ti), flickers will occur due to a delicate difference between absolute values of the positive applied voltage and the negative applied voltage.

In order to ensure high-contrast images in the embodiment of the invention, it is important to change and return the optical transmittance of the liquid crystal panel within each interval. Therefore, the frame cycle must be set appropriately in accordance with characteristics of the liquid crystal. If the frame period is short, the optical transmittance of a certain liquid crystal fails to return to the original level within the interval, and it results in a decrease in contrast ratio. In contrast, if the frame period is long, flickers are liable to occur.

The duration of time required for the optical transmittance to return to the original level largely varies with the property of the liquid crystal material, especially, the viscosity of the liquid crystal material. Therefore, by selecting an appropriate liquid crystal whose optical transmittance quickly returns to the original level, high-contrast images with substantially no flicker can be realized. Even when a normal liquid crystal is used,. the time for returning the optical transmittance to the original level can be shortened by increasing the temperature to adjust the viscosity, and high-contrast images can be ensured.

Although the embodiment has been explained by way of a specific embodiment, it is not limited to these examples, but involves various changes or modifications.

For example, the embodiment shown in Fig. 1 has been explained as using a normally-black liquid crystal panel which displays black under no applied voltage. However, the same effects are promised even with a normally-white liquid crystal panel configured to display white under no applied voltage, by appropriately modifying the voltage to be applied for a predetermined time in predetermined intervals. Also with special liquid panels different from typical liquid crystal panels in relation between the applied voltage and the optical transmittance, substantially the same effects are promised by appropriately modifying the voltage to be applied for a predetermined time in predetermined intervals.
As described above, according to the invention, since the applied voltage to the liquid crystal is returned to a predetermined voltage value for a predetermined time in predetermined intervals, the liquid can be driven very quickly. Therefore, on a liquid crystal panel using the invention, the operation for displaying and completely erasing an image can be completed in a very short time, and high-quality moving images are promised.

Additionally, since the waveform of the applied voltage used in the invention is essentially the same as that used for TFT systems, the invention is applicable also to TFT

liquid crystal panels. Also for other driving systems, the operation speed of liquid crystals can be increased by appropriately changing the applied voltage value for a predetermined time in predetermined intervals.

Moreover, since the method according to the invention is configured to complete the operation for displaying an image and erasing it completely within each frame interval, it is optimum for color images by tricolor back-lighting, and can realize high-performance, inexpensive color displays.

Claims (10)

1. A method for driving a nematic liquid crystal in a liquid crystal display device which includes the nematic liquid crystal, two electrodes confining the nematic liquid crystal and a pair of polarizing plates sandwiching the electrodes and the nematic liquid crystal, comprising:
applying a voltage corresponding to image data between said two electrodes in each frame period and thereby displaying an image on said liquid crystal display device; and subsequently applying an adequate voltage between said two electrodes in each frame period irrespectively of the image data and thereby erasing the image displayed on said liquid crystal display device within the same frame period, characterized in that the voltage corresponding to the image data is inverted in polarity in each said frame period such that the average of voltages applied to the liquid crystal in each said frame period is reduced substantially to zero.
2. The method according to claim 1, wherein erasing the image involves driving the liquid crystal such that the display device displays substantially black.
3. The method according to claim 1 or 2, wherein the liquid crystal display device is normally black, and the adequate voltage is zero volts.
4. The method according to claim 1, 2 or 3, wherein said nematic liquid crystal is heated to a predetermined temperature.
5. The method according to any one of claims 1 to 4, wherein said liquid crystal display device is a TFT liquid crystal display device.
6. The method according to any one of claims 1 to 5, wherein the applied voltage is changed to or maintained at said adequate voltage for a predetermined time in predetermined intervals.
7. A system for driving a nematic liquid crystal in a liquid crystal display device including said nematic liquid crystal, two electrodes confining the nematic liquid crystal and a pair of polarizing plates sandwiching the electrodes and the nematic liquid crystal, comprising:
means for applying a voltage corresponding to image data between said two electrodes in each frame period to display an image on said liquid crystal display device; and means for subsequently applying an adequate voltage between said two electrodes in each frame period irrespectively of the image data to erase the image displayed on said liquid crystal display device within the same frame period, characterized in that the voltage corresponding to the image data is inverted in polarity in each said frame period such that the average of voltages applied to the liquid crystal in each said frame period is reduced substantially to zero.
8. The system according to claim 7, wherein the liquid crystal display device is a TFT liquid crystal display device.
9. The system according to claim 7 or claim 8, further comprising means for changing the applied voltage to or maintaining the applied voltage at said adequate voltage for a predetermined time in predetermined intervals.
10. The system according any one of claims 7 to 9, wherein the system is capable of carrying out the method of any one of claims 1 to 7.
CA2243383A 1997-09-12 1998-07-20 Method for driving a nematic liquid crystal Expired - Fee Related CA2243383C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP9-267819 1997-09-12
JP26781997A JPH1184341A (en) 1997-09-12 1997-09-12 Method for driving nematic liquid crystal

Publications (2)

Publication Number Publication Date
CA2243383A1 CA2243383A1 (en) 1999-03-12
CA2243383C true CA2243383C (en) 2012-12-18

Family

ID=17450053

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2243383A Expired - Fee Related CA2243383C (en) 1997-09-12 1998-07-20 Method for driving a nematic liquid crystal

Country Status (7)

Country Link
EP (1) EP0903721A3 (en)
JP (1) JPH1184341A (en)
KR (1) KR100639602B1 (en)
CN (1) CN1161729C (en)
CA (1) CA2243383C (en)
HK (1) HK1019106A1 (en)
TW (1) TW421775B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7119775B2 (en) 2000-12-22 2006-10-10 Hunet Display Technology Inc. Liquid crystal drive apparatus and gradation display method

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2346974A1 (en) * 1973-09-18 1975-04-03 Commissariat Energie Atomique Nematic crystal display junction-points values control - uses stimulation signals from voltage sources to junction electrodes
DD292601A7 (en) * 1987-04-15 1991-08-08 Zentralinstitut Fuer Elektronenphysik,De METHOD FOR CONTROLLING A LIQUID CRYSTAL CELL
JPH03132692A (en) * 1989-10-18 1991-06-06 Matsushita Electric Ind Co Ltd Method for driving liquid crystal display device and its driving circuit
US5088806A (en) * 1990-01-16 1992-02-18 Honeywell, Inc. Apparatus and method for temperature compensation of liquid crystal matrix displays
JP2901438B2 (en) * 1992-10-07 1999-06-07 シャープ株式会社 Driving method of liquid crystal display device
JPH1069260A (en) * 1996-08-26 1998-03-10 Buraito Kenkyusho:Kk Method for driving nematic liquid crystal

Also Published As

Publication number Publication date
KR100639602B1 (en) 2006-12-19
EP0903721A2 (en) 1999-03-24
HK1019106A1 (en) 2000-01-21
JPH1184341A (en) 1999-03-26
TW421775B (en) 2001-02-11
CN1161729C (en) 2004-08-11
CA2243383A1 (en) 1999-03-12
KR19990029212A (en) 1999-04-26
CN1211778A (en) 1999-03-24
EP0903721A3 (en) 1999-07-21

Similar Documents

Publication Publication Date Title
US6154191A (en) System and method for driving a nematic liquid crystal
US6567063B1 (en) High-speed driving method of a liquid crystal
KR100883270B1 (en) Method and apparatus for driving liquid crystal display
KR100331730B1 (en) Liquid crystal display apparatus and driving method thereof
JP3034612B2 (en) Matrix type LCD panel addressing method
KR100749851B1 (en) Driving method of liquid crystal display device and liquid crystal display device
US5663743A (en) Dynamic scattering matrix liquid crystal display having voltage booster in driving voltage supply circuit
US6396467B1 (en) System and method for driving a nematic liquid crystal
JP3428786B2 (en) Display device driving method and liquid crystal display device
CA2243383C (en) Method for driving a nematic liquid crystal
US20010052885A1 (en) Method for driving a nematic liquid crystal
CA2215226C (en) System and method for driving a nematic liquid crystal
KR100538330B1 (en) Liquid crystal display and driving method thereof
CA2215867C (en) System and method for driving a nematic liquid crystal
JP3210385B2 (en) Liquid crystal display
JP2001051304A (en) Liquid crystal display element and its driving method
JPS63259516A (en) Method for driving matrix type liquid crystal display body
JP3599732B2 (en) Image display method in liquid crystal display device
JPH0863128A (en) Liquid crystal display device and its driving system
JPH09330062A (en) Liquid crystal display device
JP2003158695A (en) Method for driving nematic liquid crystal
JP2003066414A (en) Method for driving nematic liquid crystal
KR20030069031A (en) Driving method of liquid crystal display device and liquid crystal display device
JPH08338983A (en) Display device
KR19990025112A (en) How to drive a nematic liquid crystal

Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed

Effective date: 20160720