CN1138913A - Correction circuit to compensate for parameter changes in an active matrix display - Google Patents
Correction circuit to compensate for parameter changes in an active matrix display Download PDFInfo
- Publication number
- CN1138913A CN1138913A CN95191286A CN95191286A CN1138913A CN 1138913 A CN1138913 A CN 1138913A CN 95191286 A CN95191286 A CN 95191286A CN 95191286 A CN95191286 A CN 95191286A CN 1138913 A CN1138913 A CN 1138913A
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- CN
- China
- Prior art keywords
- signal
- voltage
- row
- display device
- pixel
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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
- G09G3/367—Control of matrices with row and column drivers with a nonlinear element in series with the liquid crystal cell, e.g. a diode, or M.I.M. element
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2230/00—Details of flat display driving waveforms
Abstract
Correction circuit in which the influence of drive signals, particularly column signals on feedback lines (39) signalling changes in elements (notably ageing of switches (35)) is eliminated. To this end, a fraction of the incoming (video) signal (42) is mixed with the signal from the feedback line (39).
Description
The present invention relates to a kind of display device, this display device comprises: the PEL matrix that is arranged in rows and columns, in order to drive one group of column electrode and one group of row electrode of pixel, and (each pixel is made of the photoelectric display unit that is connected to column electrode or row electrode by converting unit) provides the drive unit of row selection signal to column electrode; And the drive unit that data-signal is provided to the row electrode; This display device comprises the compensation system that compensates row selection signal.
For instance, this class display spare is used in the display monitor central monitoring system, also is used in the device of using video.
In EP-A-0523797 (PHB33.732), this class display spare above-mentioned has been described.In the device shown in these documents, detect by sensor circuit such as change because of the aging MIM characteristic that causes.This sensor circuit comprises one or more capacitors, and in corresponding example, capacitor is made of the electric capacity of the pixel that additionally provides that comprises the liquid crystal display pixel.According to the voltage difference between capacitor voltage at both ends (can be to give enough the time period, such as the average voltage that is about the picture and selecting time) and reference voltage, the elimination that compensates row selection signal is such as aging or Temperature Influence.Then, preferably reference voltage is set at a value that is associated with middle ash.
Be to suppress the degeneration of liquid crystal material, the drive voltage signal that periodic variation strides across liquid crystal display is such as being the cycle with each row select time.Problem in above-mentioned device is that for the liquid crystal material of certain respective type, the mean value of (data) voltages of being correlated with different brightness on the row electrode in different fields is different, also is different from the value relevant with middle ash.Because the voltage that is used on the visual row electrode that shows can pass through the voltage that the capacitive cross (talk) influence sensor circuit electric capacity two ends, this reference voltage is with regard to Tai Gao and too low, and the compensation that selection voltage is set is also with regard to Tai Gao or too low.This not only can cause image flicker, also can cause contrast to reduce and image retention.
The objective of the invention is to get rid of problem above-mentioned.For this reason, being characterised in that based on display device of the present invention provides the compensation system that has means for correcting, and means for correcting will be according to the data-signal rectification building-out degree that provides.
Provide with black (in vain) coherent signal in reference voltage can be because of capacitive cross (talk) become too low (or too high), said means for correcting provides the adaptability of selecting voltage, has eliminated the deviation that may cause because of capacitive interference on the electric capacity of sensor circuit.
Said means for correcting can realize by the attenuator of low frequency filter and filtering signal, and low-pass filter averages (and in the example of being mentioned with its reversing) to for example introducing signal during picture is selected.
These and other aspect of the present invention is passed through and can be obvious and clear with reference to the embodiment of narration hereinafter.
In the drawings:
Fig. 1 has diagrammatically represented according to display device of the present invention;
Fig. 2 has represented to be used for the representative value of some column voltages of this device;
Fig. 3 has diagrammatically represented correcting mode used in device shown in the EP-A-0523797;
Fig. 4 has diagrammatically represented used correcting mode in device according to the present invention.
Fig. 1 is that expression is used for display message, the display device of video image for example, and this display device comprises active matrix or LCD panel 10, and LCD panel 10 is made of m capable (1 to m), and every row has n (1 arrives n) pixel.In this example, each pixel 12 comprises phase meander configuration liquid crystal display cells 14, be connected electrically to non-linear bipolar switching device 15 (in this example its polyphone, metal-insulator-hardware or MIM, or metal-semiconductor-metal element or MSM), it is as row or select lead 16 and the switching device of 17 of row or data conductor.Pixel 12 drives by the row and column lead, and the configuration of row and column lead subtend towards the edge that for example is two substrate (not shown) of glass, also provides the plane electrode of pixel thereon.Switching device 15 is configured in on a slice substrate with column electrode group or row lead 16.
Successfully select capable lead 16 by horizontal drive circuit 20, provide data-signal by column drive circuit 22 for column wire or row electrode simultaneously.According to its order, these driving circuits are also controlled regularly in control circuit by control circuit 25 controls.Apply the signal of timing signal and decision selection signal voltage to horizontal drive circuit 20 by line 26 and 27 respectively from control circuit 25.By one or more line 28 signal of determination data signal (vision signal) voltage is applied to column drive circuit 22 respectively from control circuit 25, selects used timing signal synchronously to apply timing signal by one or more line 29 and row simultaneously.
In the present embodiment, bipolar switching device is made of MIM.But other non-linear bipolar switching devices will be used as for example diode ring, back-to-back diode or other diode structures in turn.
The device of Fig. 1 also comprises reference circuit 34, and reference circuit 34 is connected in series with capacitor 36 by MIM35 and forms.By being that electric capacity 36 selects pixel simultaneously by producing MIM35 with other MIM15, reference circuit 34 is worked in the identical substantially mode of the pixel relevant with switching device.By this way, reference circuit 34 is applicable to that test example is as the change in voltage because of temperature variation or the aging MIM two ends that cause.
MIM35 be connected to additional (m+1) row lead 16 ' on, after selected m is capable by similar signal with the mode identical with row 1-m select lead 16 '.Described in EP-0523797, in the process of selecting capacitor 36 or corresponding pixel, provide voltage to the capacitor end that is not connected to MIM.The voltage difference and the reference voltage at capacitor two ends compare, and proofread and correct or do not proofread and correct selecting voltage according to possible voltage difference.In this example, select additional (m+1) row lead 16 ' process in, provide given voltage by column drive circuit 22 via for example row electrode 1.The voltage that is provided is for example relevant with middle ash voltage.By line 39 voltage on the capacitor-end that is connected to MIM is offered control circuit then, this control circuit is an ingredient of control circuit 25.This voltage (whenever with row electrode (middle ash) when being in same magnitude of voltage) directly be associated with the voltage difference at capacitor two ends.With the voltage difference at capacitor two ends and reference voltage are compared with the variation of record MIM characteristic similar, the voltage on the line 39 can with for example voltage V
mCompare V
mBe associated with the value that provides on the row electrode.This diagrammatically illustrates in Fig. 3.In Fig. 3, if necessary, the signal of line 39 in buffer circuit 40, be cushioned at first in case then in operation amplifier circuit 41 with expectation voltage V
mCompare.Depart from V according to this signal
mDegree provide correction signal, this signal correction row selection signal V
S+And V
S-As shown in phantom in Figure 1, in the process of selecting (m+1) row, can select a plurality of capacitors (additional pixels).Detect mean value on online then 39 approx.
Significantly, but not fully, be not connected on the row electrode that the signal that produces at the capacitor two ends may depart from this value because of the cross (talk) of other row electrodes so if be connected to the capacitor-end of MIM (or display unit).This names a person for a particular job with reference to figure 2 explanations, figure 2 illustrates the column voltage value of typical liquid crystal pixel.Drive in the design at great majority, the polarity of voltage at pixel two ends changes regularly, and for example each frame period changes.Will be referred to positive signal and negative signal hereinafter.Complicated is that used swing voltage is not identical for two signals; For example, the column voltage that Fig. 2 a shows corresponding pixel in just distinguishing changes between 3V (deceiving) and 7V (in vain), and they change between 3.6V (in vain) and 6.4V (deceiving) in minus zone, and the column voltage of middle ash is 5V in two districts.
If, such as helping black (Fig. 2 b) to the one or more pixel driving in the row 1, in just distinguishing, provide the column voltage of 3V, the column voltage of 6.4V is provided in minus zone.Therefore the average voltage on the row electrode is 4.7V, that is to say, low 0.3V.But, if on the other hand, alternately, in just distinguishing, provide the column voltage of 7V the one or more pixel driving in the row 1 complete white (Fig. 2 c), the column voltage of 3.6V is provided in minus zone.Therefore the average voltage on the row electrode is 4.7V, that is to say high 0.3V.Tone of gray to the centre has carried out the simulation demonstration.The value that these of average column voltage are too high or too low produces the capacitive cross (talk) in the capacitance terminal (or display unit) of the MIM that is not connected to reference circuit, and by gratifying feedback of circuit function shown in Figure 3.In case set, under this setting, can be destroyed by the cross (talk) in the reference circuit for obtaining minimum flicker and the corresponding row electrode of middle ash value.
According to the present invention,, proofread and correct selection voltage in advance according to signal cross (talk) from the reference circuit on the line 39 34 for avoiding this situation.After being inverted for the first time in this embodiment, introducing (video) signal 42 and mix with signal 39 from buffer circuit 40 by low-pass filter 43 and attenuator 44.In this example, in summing circuit 45, carry out the stack of signal.Because the voltage in just distinguishing is too high, a part of adding the inversion positive signal is so that the voltage on the reduction line 46.Because voltage is too low in negative pressure it is increased the negative signal that a part has been reversed, to improve the voltage on the line 46.By suitably choosing the attenuation coefficient of attenuator 44 and wave filter 43, signal 39 is proofreaied and correct by this way, make by the cross (talk) influence of row and ignore.Although (video) signal is squeezed, equipment and/or type of drive are feasible, and wherein two middle grey level is to list the opposite side of average voltage.Be inverted just optional in this case.
In general, the invention provides a kind of correcting circuit, in this circuit, eliminated the influence of drive signal, especially eliminated the influence of the column signal on the feedback line that the sign element changes (especially switch is aging).For this reason, a part of introducing (video) signal is mixed with signal from feedback line.
Claims (5)
1. display device comprises:
The pixel battle array that is arranged in rows and columns; Drive one group of column electrode and one group of row electrode of pixel, each pixel is made up of the electro-optic display cell that is connected to column electrode or row electrode by switch unit; The drive unit of row selection signal is provided to column electrode; And the drive unit that data-signal is provided to the row electrode; This display device comprises the compensation system that compensates row selection signal;
It is characterized in that:
The compensation system that has means for correcting is provided, and means for correcting is according to the data-signal rectification building-out degree that is provided.
2. the display device of recording and narrating in the claim 1 is characterized in that:
Switch unit comprises non-linear bipolar switching device.
3. the display device of recording and narrating in the claim 1 or 2 is characterized in that:
The compensation system of compensation drive signal comprises the scanister that is used to detect the switch unit characteristic changing.
4. the display device of recording and narrating in the claim 1,2 or 3 is characterized in that:
Means for correcting is handled from the signal of compensation system and the introducing data-signal that is used to proofread and correct drive signal.
5. the display device of recording and narrating in the claim 4 is characterized in that:
Means for correcting comprises low-pass filter and introduces the attenuator of data-signal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP94203393.7 | 1994-11-22 | ||
| EP94203393 | 1994-11-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1138913A true CN1138913A (en) | 1996-12-25 |
Family
ID=8217399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95191286A Pending CN1138913A (en) | 1994-11-22 | 1995-10-25 | Correction circuit to compensate for parameter changes in an active matrix display |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0740826A1 (en) |
| JP (1) | JPH09509758A (en) |
| KR (1) | KR970700897A (en) |
| CN (1) | CN1138913A (en) |
| WO (1) | WO1996016392A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1708778B (en) * | 2002-10-31 | 2012-05-02 | 株式会社半导体能源研究所 | Display device and controlling method thereof |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9524071D0 (en) * | 1995-11-24 | 1996-01-24 | Philips Electronics Nv | Active matrix diplay device |
| US6498592B1 (en) * | 1999-02-16 | 2002-12-24 | Sarnoff Corp. | Display tile structure using organic light emitting materials |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9115401D0 (en) * | 1991-07-17 | 1991-09-04 | Philips Electronic Associated | Matrix display device and its method of operation |
| US5206633A (en) * | 1991-08-19 | 1993-04-27 | International Business Machines Corp. | Self calibrating brightness controls for digitally operated liquid crystal display system |
-
1995
- 1995-10-25 JP JP8516703A patent/JPH09509758A/en active Pending
- 1995-10-25 KR KR1019960703891A patent/KR970700897A/en not_active Application Discontinuation
- 1995-10-25 WO PCT/IB1995/000924 patent/WO1996016392A1/en not_active Application Discontinuation
- 1995-10-25 EP EP95933598A patent/EP0740826A1/en not_active Withdrawn
- 1995-10-25 CN CN95191286A patent/CN1138913A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1708778B (en) * | 2002-10-31 | 2012-05-02 | 株式会社半导体能源研究所 | Display device and controlling method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| KR970700897A (en) | 1997-02-12 |
| EP0740826A1 (en) | 1996-11-06 |
| JPH09509758A (en) | 1997-09-30 |
| WO1996016392A1 (en) | 1996-05-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |