CN1211778A - Driving system of nematic liquid crystal - Google Patents
Driving system of nematic liquid crystal Download PDFInfo
- Publication number
- CN1211778A CN1211778A CN 98109565 CN98109565A CN1211778A CN 1211778 A CN1211778 A CN 1211778A CN 98109565 CN98109565 CN 98109565 CN 98109565 A CN98109565 A CN 98109565A CN 1211778 A CN1211778 A CN 1211778A
- Authority
- CN
- China
- Prior art keywords
- liquid crystal
- nematic liquid
- light transmission
- driving system
- institute
- 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.)
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Classifications
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- 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
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- 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
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- 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
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- 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
The present is to increase a response speed, and to obtain the performance equal to or higher than the performance of a display using a kinescope in coloration by tricolor back lights color display and image reproduction. In a liquid crystal display device combining a nematic liquid crystal confined between two electrodes with polarizing plates, a voltage applied between two electrodes is maintained in a predetermined value for a predetermined duration of time in predetermined intervals.
Description
The present invention relates to a kind of LCD drive method, relate in particular to driving system of nematic liquid crystal.
Know, clip nematic liquid crystal having between 2 transparent plates of transparency electrode, place between 2 polarization plates, the light transmission that sees through above-mentioned 2 polarization plates just changes with above-mentioned 2 transparency electrodes institute making alive.
Use the liquid crystal indicator of this principle, its characteristics are, thin thickness, and power consumption is few, has been widely used in wrist-watch and desk top computer.
In recent years, with the colored filter combination, be used for the colored display device that shows such as notebook personal computer or small-sized LCD TV.
With the colored filter combination, can carry out in the middle of the colored liquid crystal indicator that shows, red, green, blue 3 colour points combination carrying out colour shows, but this colored filter is very expensive, and the operation of putting up the face screen also requires high precision.
In addition, the resolution identical be obtained, 3 times of picture point numbers must be needed with the black-and-white crystal display screen, thereby the driving circuit number of horizontal direction gets 3 times in the common LCDs, the contact number of not only cost height, and display screen and driving circuit also gets 3 times, connects also difficulty of operation.
Thereby as carry out the colored method that shows with LCDs, with the mode of colored filter, the factor that cost increases is more, is difficult to make cheaply.And, also have the light transmission of colored filter only to have an appointment 20%, become with colored filter brightness about 1/5th, the power consumption backlight very big this shortcoming that becomes.
And existing liquid crystal indicator because liquid crystal response speed is slow, is carrying out image playback such as TV, or the occasions such as mouse high speed activities of personal computer etc., compares degradation with the display that adopts kinescope.
As color liquid crystal display arrangement without colored filter, opening flat 1-179914 as the spy proposed a kind of black-and-white crystal display screen and the combination backlight of 3 looks and carried out the colored method that shows, compare with the colorized optical filtering sheet mode, realize at an easy rate that more likely careful colour shows.But by existing LCD drive method, the response speed of nematic liquid crystal will spend a few tens of milliseconds to the hundreds of millisecond.Thereby, with the LCDs of nematic liquid crystal, be considered to be difficult to obtain the 3 looks response speed that realizes that colour can reach backlight, promptly than 8 milliseconds of fast speed.
As the LCDs of high speed operation, the LCDs that a kind of usefulness is responded to liquid crystal or anti-strong induction liquid crystal was by force proposed, cell gap need form and be lower than the very narrow gap of 1 μ m etc., makes difficulty, is difficult to practicability.
Problem to be solved by this invention, be by changing driving method, used in the past TN type or STN type nematic liquid crystal response speed are accelerated, can obtain with based on above-mentioned 3 looks colorize backlight, or the equal above performance of the display of using kinescope in the middle of the image playback, that is to say, provide a kind of response speed fast driving system of nematic liquid crystal.
The present invention that will address the above problem is characterized in that just, by by timing on liquid crystal the making alive different with the available liquid crystal driving circuit, liquid crystal response is speeded up.
The present application people, in order to develop the 3 looks LCDs that realizes the colored response speed that can reach backlight, when the dynamic perfromance of nematic liquid crystal institute making alive waveform and light transmission is measured, find the state that light transmission changes at a high speed when existing institute's making alive to change by institute's making alive waveform.
By repeating to take place the state that this light transmission changes at a high speed, can obtain the chromatic liquid crystal screen of more faster than existing driving method, the bright and low-power consumption of a kind of response speed.
Shown in Fig. 1 is the time variation diagram that nematic liquid crystal light transmission of the present invention changes with respect to institute's making alive.
Shown in Fig. 2 is the time variation diagram that prior art nematic liquid crystal light transmission changes with respect to institute's making alive.
Fig. 1 illustrates the variation of institute's making alive waveform and absolute value thereof, light transmission to embodiment of the invention nematic liquid crystal display screen.Fig. 2 then illustrates the variation of institute's making alive waveform and absolute value thereof, light transmission to the prior art nematic liquid crystal display screen of embodiment of the invention correspondence.
Nematic liquid crystal display screen among Fig. 1 and Fig. 2 is used in the past TN type liquid crystal of a kind of employing or STN type liquid crystal, makes liquid crystal material and cell gap for best, the display screen that obtains speeding up.Fig. 1 and LCDs among Fig. 2 are with regard to identical display screen.And T1 to T6 is the identical time among Fig. 1 and Fig. 2, and time span is less than the colored required liquid crystal drive cycle of above-mentioned 3 looks mode backlight, promptly less than time of 8 milliseconds.
As in the past, the liquid crystal light transmission is irrelevant with respect to an alive variation of institute and an alive polarity.But, liquid crystal material is just arranged because of problems such as electrochemical reaction variation, so generally just make institute's making alive polarity anti-phase at regular intervals because in a single day liquid crystal continues to add DC voltage.In the embodiment of the invention, it is anti-phase also to carry out polarity, but the liquid crystal high-speed driving that will realize for the present invention, the liquid crystal responsiveness is with the anti-phase not bigger variation of carrying out of polarity.In the liquid crystal of the present invention institute making alive, the absolute value irrelevant with polarity becomes problem.Below, the present invention's action is described by comparison to Fig. 1 and Fig. 2.
There is two states in the driving method of the embodiment of the invention as shown in Figure 1 in each section of T1 to T6 period: institute's making alive absolute value be during V1 or the 0V according to view data and institute's making alive absolute value press some cycles within a certain period of time must be for during the 0V.
Among Fig. 1, during T3 and the T5, institute's making alive absolute value is 0V always, and light transmission also is in black state always.
Among Fig. 1, during T1, T2, T4 and the T6, originally institute's making alive absolute value is V1, and light transmission is changed to white states.Next institute's making alive absolute value is 0V, and light transmission is changed to black state.Thereby each section period light transmission becomes white at a high speed from black, and then gets back to black at a high speed.
In the existing driving method, as shown in Figure 2, institute's making alive absolute value with view data to display be V2 and 0V one of them, but institute's making alive absolute value is certain during this period of time up to switching to next view data.In this driving method, TN liquid crystal or stn liquid crystal display screen responsiveness are slow, and for example, as T2 to T3 among Fig. 2, even if institute's making alive is changed to 0V from V2, light transmission also not exclusively becomes black during T3.
Comparison diagram 1 and Fig. 2 are in the added voltage of white states in order to make light transmission, are illustrated in figure 2 as V2 in existing driving method, but in the embodiment of the invention then as shown in Figure 1, can add the voltage V1 higher than V2.So light transmission becomes the white time by black, the embodiment of the invention can be accelerated.In addition, as the embodiment of the invention, the making alive absolute value is always 0V within a certain period of time by some cycles by making, and white becomes the time of black and also can accelerate.
In the embodiment of the invention, it is anti-phase to carry out polarity in the period at each section as shown in Figure 1, so that the average voltage of each section of T1 to T6 period is roughly 0V.This be because, the liquid crystal high speed motion, so each section makes polarity anti-phase in the period, just can owing to adding positive voltage with add the small absolute value difference of negative voltage and produce the cause of flicker.
The embodiment of the invention is to not showing that the normal black liquor crystal display screen of black describes under the making alive state, but for pressing the added voltage of some cycles certain hour by changing, the normal white liquid crystal display screen of display white also has effect same under making alive state not.And, with the different special LCDs of LCDs usually, can reach same effect by being set at suitable value for relation between liquid crystal institute making alive and the light transmission equally by the added voltage of some cycles certain hour.
In the embodiment of the invention, for the high demonstration of degree of comparing, need be in one-period after the variation of LCDs light transmission, light transmission is got back to original state.
So, in the embodiment of the invention, shortening the frame period, light transmission just transitted to following one-period before getting back to original state fully.Contrast just descends.And prolong the frame period, problems such as the flicker of generation are just arranged.
Light transmission is got back to the time of original state, with the characteristic of liquid crystal material, and viscosity of liquid crystal material etc. especially, great changes have taken place.
So the time of getting back to original state by the selective light transmissivity just can be suppressed flicker and take place, and carry out the high demonstration of contrast than short liquid crystal material.
The time that light transmission is got back to original value is to be subjected to very big influences such as liquid crystal material viscosity, thus by rising LCDs temperature, even if do not change liquid crystal material, also can the high demonstration of degree of comparing.
According to the present invention, by changing voltage waveform, LCDs display image to the complete blanking of this image can be carried out in the very short time, can obtain response speed very at a high speed, belongs to the best mode of image playback.
According to the present invention, with the TFT mode used to apply voltage waveform basic identical, can be used for the LCDs of TFT mode.In addition,, also can be assigned voltage within a certain period of time by some cycles by making alive, improve the liquid crystal responsiveness by making for other type of drive.
In addition, because a kind of like this mode, promptly LCDs display image to the complete blanking of this image is the mode of carrying out in 1 frame time, thereby for above-mentioned usefulness 3 looks color display method backlight, be the best approach, can realize the color monitor of high-performance and low price.
Claims (3)
1. driving system of nematic liquid crystal, for nematic liquid crystal, clip two electrodes of described liquid crystal, and the liquid crystal indicator of the liquid crystal that clips of described electrode and polaroid combination, it is characterized in that the cycle makes described two interelectrode voltages keep the assigned voltage stipulated time in accordance with regulations.
2. driving system of nematic liquid crystal as claimed in claim 1 is characterized in that, in described specified period, makes between described two electrodes added polarity of voltage anti-phase, so that described two interelectrode average voltages are roughly 0.
3. driving system of nematic liquid crystal as claimed in claim 1 or 2 is characterized in that, has to make the nematic liquid crystal temperature be increased to the heater means of set point of temperature.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP267819/1997 | 1997-09-12 | ||
| JP26781997A JPH1184341A (en) | 1997-09-12 | 1997-09-12 | Method for driving nematic liquid crystal |
| JP267819/97 | 1997-09-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1211778A true CN1211778A (en) | 1999-03-24 |
| CN1161729C CN1161729C (en) | 2004-08-11 |
Family
ID=17450053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB981095658A Expired - Fee Related CN1161729C (en) | 1997-09-12 | 1998-06-05 | Driving system of 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)
| 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)
| 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 |
-
1997
- 1997-09-12 JP JP26781997A patent/JPH1184341A/en active Pending
-
1998
- 1998-05-27 TW TW87108249A patent/TW421775B/en not_active IP Right Cessation
- 1998-05-28 KR KR1019980019532A patent/KR100639602B1/en not_active IP Right Cessation
- 1998-06-05 CN CNB981095658A patent/CN1161729C/en not_active Expired - Fee Related
- 1998-07-15 EP EP98113183A patent/EP0903721A3/en not_active Ceased
- 1998-07-20 CA CA2243383A patent/CA2243383C/en not_active Expired - Fee Related
-
1999
- 1999-09-23 HK HK99104139A patent/HK1019106A1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| CN1161729C (en) | 2004-08-11 |
| KR100639602B1 (en) | 2006-12-19 |
| CA2243383A1 (en) | 1999-03-12 |
| KR19990029212A (en) | 1999-04-26 |
| EP0903721A3 (en) | 1999-07-21 |
| JPH1184341A (en) | 1999-03-26 |
| CA2243383C (en) | 2012-12-18 |
| TW421775B (en) | 2001-02-11 |
| HK1019106A1 (en) | 2000-01-21 |
| EP0903721A2 (en) | 1999-03-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C53 | Correction of patent for invention or patent application | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: BRIGHT LAB. CO., LTD. TO: MASAYA OKITA |
|
| CP03 | Change of name, title or address |
Address after: Saitama Applicant after: Masaya Okita Address before: Tokyo, Japan Applicant before: Bright Lab. Co., Ltd. |
|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20040811 Termination date: 20160605 |