CN1012857B - Display device - Google Patents
Display deviceInfo
- Publication number
- CN1012857B CN1012857B CN87106311A CN87106311A CN1012857B CN 1012857 B CN1012857 B CN 1012857B CN 87106311 A CN87106311 A CN 87106311A CN 87106311 A CN87106311 A CN 87106311A CN 1012857 B CN1012857 B CN 1012857B
- Authority
- CN
- China
- Prior art keywords
- line
- electrode
- display device
- scan circuit
- thr
- 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
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
-
- 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)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Liquid Crystal (AREA)
Abstract
The present invention relates to a kind of novel addressing scheme that is used for passive matrix, in this passive matrix, is compensable across the voltage drop on each electrode.In the time of on simultaneously each data voltage being sent to each row electrode (4), all column electrodes (3) of the matrix of display element (12) are alternately driven from the left side and from the right side.
Description
The present invention relates to a kind of display device, it comprises: a kind of liquid crystal material between two parallel support plates with the surface that is facing one another; A kind of lip-deep all column electrode pattern and a kind of another lip-deep all row electrode pattern that are formed on of being formed on, this column electrode and row electrode are square crossings, thereby constitute display element on the intersection region.This device comprises a driving circuit that is used for to each row electrode data signal simultaneously, and one is used for the line-scan circuit that periodically each column electrode scanned.
As everyone knows, this display device generally is the voltage according to so-called effective value pattern (RMS-mode), and the pattern that drives with multichannel is come work.This drive pattern was once described on the electron device transactions 146-155 page or leaf of the IEEE of ED21 volume in 1974 by Alt and Pleshko two people, and be considered to be used to drive the most frequently used pattern of liquid crystal indicator, this liquid crystal indicator be formed into above-mentioned PEL matrix and wherein to each pixel all without active switch.Utilize this pattern, maximum line number N that can drive with satisfied contrast rating
MaxCan determine by the following relationship formula:
N
max＝[（ V
2 on+ V
2 off）/（ V
2 on- V
2 off）]
＝[（S
2+1）/（S
2-1）]
2S＝ V
on/ V
off
V in the formula
OnRepresentative is added on the display element so that it is transformed into the required voltage effective value of " leading to " attitude, and V
OffVoltage effective value when representative makes display element be in " breaking " attitude.Along with V
OnAnd V
OffConvergence more, just can drive more multirow number.Certainly this just need have precipitous threshold value in the transmission/voltage response of display element.
Be added in effective value voltage on each display element that separates of course not from the data-signal that transmitted with select voltage and come.Because the resistance of each electrode can produce voltage drop, therefore the effective value voltage that is added on each primitive is lower than and makes the required voltage of its conversion.This just causes the minimizing of the maximum number of lines that will carry out the multichannel driving.
A kind of known solution that prevents the hypotensive effect on each column electrode is at t sometime with selection voltage
SBe sent to the two ends of each column electrode during this time simultaneously.This just causes the alleviating to a certain degree of the loss of voltage.
Display device according to the present invention is characterised in that: its line-scan circuit comes to provide signal to the two ends of each column electrode in such a way, promptly at first makes the one end, and then makes its other end receive line-scan circuit to get on.
The present invention is according to this understanding, promptly preferably be essentially select time half during at first will select voltage to be sent to an end of column electrode, and then will select voltage to be sent to other end of column electrode in the same long time haply, and information to display yes is sent to each row electrode simultaneously as data voltage, by doing the loss of voltage that can reduce in each matrix that drives with effective value like this.
The selection at these two ends must not be next to afterwards mutually and realize.But preferably line-scan circuit at first will select signal to deliver to an end of all column electrodes, and then deliver to other end, because this just can be easy to realize more from the circuit engineering viewpoint.
Describe the present invention in detail with reference to accompanying drawing and some embodiment, in the accompanying drawings:
Fig. 1 schematically illustrates a kind of liquid crystal display device with section;
Fig. 2 schematically represents a kind of like this device, and wherein each pixel is pressed arranged, the related part driving circuit that illustrates together among the figure;
Fig. 3 is illustrated in the V that locates in the middle of the column electrode to different drive patterns
2 On/ V
2 ThrValue and V
D/ V
ThrThe function relation curve of value.
Display device shown in Figure 1 has two glass support plates 1 and 2, and glass support plate 1 has and comprises for example pattern of each banded column electrode 3 of indium tin oxide.Support plate 2 also has and comprises for example pattern of each banded row electrode 4 of indium tin oxide.Each electrode 3 is square crossings with electrode 4, and each display element is just formed in this point of crossing, so they are just arranged according to matrix-style.Have each electrode on each support plate 1 and 2 the surface with oriented layer 6 and 7.A kind of liquid crystal material 8 is arranged between this two support plate.Distance between this two support plate is about 10 μ m, and this distance is kept by each distance piece (not illustrating in the drawings), and is separating regularly on the support plate surface.Sealing the margin 9 links up this two support plate at a panel area.This two support plate 1 and 2 can further have a kind of linear polarizer.Be polarizer 10 and analyzer 11, but this is dispensable.By drive each electrode 3 and 4 with suitable manner, just can make each display element from first state exchange to, second an optically different state.
Fig. 2 is schematically illustrated in the matrix array of the display element 12 in this kind device.This display element comes across the column electrode 3 that is driven by line-scan circuit 13a, 13b and locates with the point of crossing of the row electrode 4 that is driven by driving circuit 14.
According to the present invention, each row selected element is to provide by line-scan circuit 13a and then by line-scan circuit 13b earlier.The duration of these pulses is bordering on equal.Preferably activate all row successively by line-scan circuit 13a, and then activate all row by line-scan circuit 13b when first when overdrive circuit 14 transmits information simultaneously.For the phase mutually synchronization with in time take over 13a by circuit 13b, this device has each line synchro 15 and each drive wire 16.
For the device that illustrates like this, when the pressure drop considered along each electrode 3, can obtain driving higher multichannel ratio than shared bilateral.This will be described hereinafter.
For example drive unilaterally under the situation of each column electrode 3 at the line-scan circuit 13a from Fig. 2, voltage is from the α of for example 13a
oV
sDrop to the Vs at line-scan circuit 13b place, wherein α
o＞1.On the (a) and (b) each point, following formula is at 1/2 t
sUse α during this time respectively from both sides
oV
sThe capable situation about driving of N is suitable for:
V
2 on（a，b）＝1/2N（α
oV
s+V
D）
2+1/2N（V
s+V
D）
2+[（N-1）/N]V
2 D（1）
V
2 off（a，b）＝1/2N（α
oV
s-V
D）
2+1/2N（V
s+V
D）
2+[（N-1）/N]V
2 D（2）
This relational expression is V at boundary condition
Off=V
ThrThe time preferred process can make all (a) and (b) between each magnitude of voltage V
OnToo low, V wherein
ThrIt is the voltage threshold of electricity one smooth luminous effect.
In order to obtain wherein V
OnBe the position (p) of minimum, by way of example, suppose that α (p) is linear, then:
When from left addressing, α (p)=α
o+ (1-α
o) p
When from right addressing, α (p)=1+(α
o-1) p
These supposition can be drawn a conclusion with formula (1), (2), promptly when p=1/2, and α V
OnBe minimum; In other words, expression formula:
V
2 on（p＝1/2）＝（1/N）（α′V
s+V
D）
2+[（N-1）/N]V
2 D（3）
In α '=(α+1)/2 o'clock, must be at boundary condition:
V
2 Off(a, b)=V
2 Thr, or (2) formula of utilization changes into:
（1/2）N（α
oV
s-V
D）
2+1/2N（V
s+V
D）
2+[（N-1）/N]V
2 D＝V
2 thr（4）
Carry out optimization.
To α
oWith each given value of N, just can determine V according to (4) formula
s/ V
ThrAnd V
D/ V
ThrVarious combinations.Each all available equation of combination (3) to this combination is calculated each V
2 On(p=1/2)/V
2 ThrValue.Fig. 3 is shown in dotted line N=128, α
oThe V of one group of electrode of=1.10 liquid crystal indicators that are suitable for
2 On(p=1/2)/V
2 ThrValue is to V
D/ V
ThrThe relation curve of value.As can be seen from Figure 3, to V
D/ V
Thr=0.74 o'clock, V
2 On/ V
2 ThrMaximal value be about 1.19.The V that it is relevant
S/ V
ThrValue is about 7.95.Therefore for making job satisfaction, will (yes be suitable for formula S a kind of like this
2=V
2 On/ V
2 Off) threshold slope S is at least and selected a kind of electrical-optical medium at 1.19 o'clock; According to the relational expression of Alt and Pleshko, this slope just is equivalent to one near 130 N
MaxValue.Certainly the electro-optical medium that has more precipitous threshold voltage characteristic also suits.
For the occasion that drives the selection electrode on (bilateral driving) left side and the right side simultaneously, also can carry out same calculating.If like this, boundary condition V
2 Off(a, b)=V
2 ThrCan derive expression formula:
V
2 off/V
2 thr＝1＝（α
oV
s-V
D）
2/N+[（N-1）/N]V
2（5）
If to the N=128 of certain electrode system, and α
o=1.10, the block curve of derived graph 3 more then.Thus, under the obvious situation about driving at the same time, concerning same electrode system, ratio V
2 On(p=1/2)/V
2 ThrThan driving less under (reverse scan) occasion respectively.In this example, this ratio is about 1.14.According to Alt and Pleshko relational expression, corresponding to N
MaxBe about 215 situation, be applicable to formula S
2=V
2 On/ V
2 ThrThe slope of electrical-optical medium be 1.14.
Therefore, under the electrode configuring condition that equates, the electrical-optical medium that bilateral or driving simultaneously need, the N that it was suitable for
MaxHigher than the medium that in method of the present invention (reverse scan), can use.In order further to illustrate, table 1 is for having 128 and various different αs capable with 256
oEach electrode system of value illustrates some comparative numeral.This expresses relevant V
On/ V
ThrMaximum ratio and according to Alt each corresponding with it N with Pleshko
MaxValue.
Multichannel was than 1: 128
The reverse scan bilateral
α
oV
2 on/V
2 thrmax N
maxα
oV
2 on/V
2 thrmax N
max
（P＝ 1/2 ） opt.eff （P＝ 1/2 ） opt.eff
1.00 1.1939 128 1.00 1.1939 128
1.03 1.1938 129 1.03 1.1772 151
1.05 1.1935 129 1.05 1.1674 168
1.10 1.1924 130 1.10 1.1465 215
1.15 1.1908 132 1.15 1.1300 269
1.20 1.1868 135 1.20 1.1168 329
Multichannel was than 1: 256
The reverse scan bilateral
α
oV
2 on/V
2 thrmax N
maxα
oV
2 on/V
2 thrmax N
max
（P＝ 1/2 ） opt.eff （P＝ 1/2 ） opt.eff
1.00 1.1333 256 1.00 1.1333 256
1.05 1.1330 258 1.05 1.1089 376
1.10 1.1320 261 1.10 1.0909 530
1.15 1.1304 267
1.15 1.0776 717
(seeing the person of marking with X) some data are shown in the table especially, for example, at α
oIn=1.15 the system, the multichannel ratio is under 1: 128 the bilateral driving situation, a kind of N that is suitable for
Max=268 medium still can just be driven, and for reverse scan, the multichannel ratio be 1: 256 but be possible.
Certainly the present invention is not limited to described embodiment, but to one skilled in the art, it is possible doing some changes within the scope of the invention.For one thing, shown in drive pattern can, for example combine with the introduction of respectively selecting voltage and variable data described in the PHN.11.867 application for patent that proposes simultaneously with applicant's name.
Claims (3)
1, a kind of display device, it comprises a kind of liquid crystal material between two parallel support plates with the surface that faces one another, be configured in a lip-deep column electrode pattern and be configured in another lip-deep row electrode pattern, each column electrode and each row electrode square crossing, so just form each display element in the location of point of crossing, this device comprises the driving circuit and the line-scan circuit that is used for periodically each column electrode being scanned that is used for data-signal is sent to the row electrode simultaneously, this display device is characterised in that it is to terminate to line-scan circuit with one earlier that line-scan circuit provides the mode of signal to the two ends of each column electrode, and then the other end is received on this line-scan circuit.
As desired display device in claim 1, it is characterized in that 2, its line-scan circuit provides signal to an end of all column electrodes earlier, and then provides signal to the other end of all column electrodes.
As desired display device in claim 1 or 2, it is characterized in that 3, be basic equating the signal duration that is sent on the described two ends.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL8602328A NL8602328A (en) | 1986-09-15 | 1986-09-15 | DISPLAY DEVICE. |
| NL8602328 | 1986-09-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN87106311A CN87106311A (en) | 1988-03-30 |
| CN1012857B true CN1012857B (en) | 1991-06-12 |
Family
ID=19848549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN87106311A Expired CN1012857B (en) | 1986-09-15 | 1987-09-12 | Display device |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0260747B1 (en) |
| JP (1) | JPS6375732A (en) |
| KR (1) | KR880004418A (en) |
| CN (1) | CN1012857B (en) |
| DE (1) | DE3771154D1 (en) |
| NL (1) | NL8602328A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6091392A (en) * | 1987-11-10 | 2000-07-18 | Seiko Epson Corporation | Passive matrix LCD with drive circuits at both ends of the scan electrode applying equal amplitude voltage waveforms simultaneously to each end |
| JP2625976B2 (en) * | 1987-11-10 | 1997-07-02 | セイコーエプソン株式会社 | Driving method of flat panel display |
| CN101847376B (en) * | 2009-03-25 | 2013-10-30 | 北京京东方光电科技有限公司 | Common electrode driving circuit and LCD |
-
1986
- 1986-09-15 NL NL8602328A patent/NL8602328A/en not_active Application Discontinuation
-
1987
- 1987-09-10 EP EP87201715A patent/EP0260747B1/en not_active Expired - Lifetime
- 1987-09-10 DE DE8787201715T patent/DE3771154D1/en not_active Expired - Lifetime
- 1987-09-12 CN CN87106311A patent/CN1012857B/en not_active Expired
- 1987-09-14 JP JP62230884A patent/JPS6375732A/en active Pending
- 1987-09-14 KR KR870010150A patent/KR880004418A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0260747A1 (en) | 1988-03-23 |
| DE3771154D1 (en) | 1991-08-08 |
| JPS6375732A (en) | 1988-04-06 |
| NL8602328A (en) | 1988-04-05 |
| EP0260747B1 (en) | 1991-07-03 |
| CN87106311A (en) | 1988-03-30 |
| KR880004418A (en) | 1988-06-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| AD01 | Patent right deemed abandoned | ||
| C20 | Patent right or utility model deemed to be abandoned or is abandoned |