JPS59500289A - Method of driving an image display device, especially a thin film AC electroluminescent display device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Method and wiring system for moving image assisting devices, especially AC electroluminescent displays The invention relates to a method according to the preamble of claim 1. This invention f4, this person It also relates to the wiring systems used to implement the Act.

AC electroluminescent display devices based on thin film technology VC have an X electrode and a Y electrode with respect to the drive circuit. It has a two-dimensional matrix formed from electrodes. In this matrix, The M poles form the rows, whereas the Y poles shape and cut out the columns.

Other special features of such display devices are that the -1 pivot voltage is the father current voltage; - The direct current positive pressure component of the driving pressure shortens the operating life of the display device; The voltage must be lower than half of the total voltage of Hayabusa, After one refresh pulse, the brightness decreases with a typical time constant of about 1-ms. that, and The capacitance of one display device is high, -! 11+ type is about 50-200 PF /, m2, (1) T, A, Gielow (T, A, Gielow), R ``Takutei Manruhiteo Display'' written by Lr (, I) ”(”Tactical Video Display”), Report No. DELET -TR-79-0251-], 1198099, page 17.

(2) Kei, Kurahashi (KKurahashi), Kei Tatohara (K, Written by Takahara), Nisetch, Andoh (Sh, Andoh)” AC-TFEL panel reproduction address technology' ("ARfresh Add dressing Technique of AC-TFEL Panels ”), Proceedings of the 1st European Display Research Conference 7) dings of the First Europe display Research Conference) EURODJSI”LAY 8 ],]September 16-18, 1998, Munich, 2]6-2]9 pages. as well as (3) Finnish Patent Plateau tJ 8], ], 245 (Oy Loh jaAb).

In the method according to cited document (1), each row has a sub i/4 high vibration and one row J4 selection pulse. While receiving , the line in the pond remains floating at 1.

At the same time, a modulation ratio corresponding to the desired degree of seeding is added to the table. row selection pulse After this, a reverse-dependent refresh pulse is applied to all rows simultaneously. The cutoff-C is a single-use model for the pressure resistance required from the 1y1j drive circuit: I! +] Turtle It was possible to lower the level by the required level.

Banrō described in cited document (2) is Zonōmen: Ryu (1) Regarding the notes on Shi and Kyojo, see above. Those who mention +2! :'I responded to the request. The power of rubbing,,, leaving-1 the above method A high voltage pulse is applied to the jjfi circuit 7) at the ji point, and the Circuit connection - 1. Complete system (with regard to connection to the connection point) The method according to cited document (2) (in which the row driving circuit is The ground point is connected to the system ground point and the high voltage pulse is applied to the column drive circuit ground point. added.

Cited document (3) applies bipolar pulses to the rows and both the positive and negative sides of the display device. Lowering the withstand voltage requirements of the column rbtth circulation by adding modulation to the drive pulses A method is described that allows you to do so.

In all of the above refresh methods, high voltages are used to guide the row electrodes. A drive circuit is required to do this.

As is known in the prior art, high voltage withstanding circuits are difficult to integrate. Reeds, therefore expensive. In the method according to cited documents (1) and (2), Due to the unipolar modulation, a DC voltage is generated in the drive voltage of the display and the column i Another drawback is that a high 1itFK pressure component is required in the xB circuit. two The need for different drive circuits is also a major drawback.

OBJECT OF THE INVENTION (C) It is to eliminate the drawbacks occurring in prior art systems. Another object of the invention is to provide a refrigeration system based on thin film technology, especially for driving AC electroluminescent displays. The Resch method reduces the withstand voltage requirements imposed on display devices and drive circuits, and A method that reduces the power consumption of the display device and completely eliminates the DC voltage component from the one-view voltage. The purpose is to provide a refresh method. Yet another objective is to implement this method. The aim is to provide a figurine system for゛The present invention, for example, It is based on the concept of

- The capacitance of the entire display is charged to the highest fundamental voltage, but the row select pulse The configuration is such that no display element is sufficiently ignited by a single pulse or train modulation pulse. is preferable.

The row selection voltage and column selection voltage are A selection voltage is superimposed on the base voltage.

The absolute value of a half-selected display element is determined by the row selection voltage or column modulation voltage up to the maximum value. The absolute value of the voltage of the selected display element is increased by the sum of the row selection voltage and the column modulation voltage. ((Increased by more.

One fundamental voltage σ species is reversed until after all rows have received row select pulses in turn. It is preferable not to be transferred.

- the device includes two DC power supplies, one of which is the drive power supply of the row drive circuit; is the drive power supply for the column drive circuit. Additionally, the device is connected in series with a DC power supply of 10,000 Includes AC power source.

More particularly, the method according to the invention is as described in the characterizing part of paragraph 1 of the claims. The items listed are expressed as percentages.

On the other hand, the wiring system according to the present invention is as described in the feature description part of claim 7. It is characterized by matters that

Distinctive advantages are achieved with the invention. That is, row drive circuit and column drive circuit The withstand voltage required from both is approximately 30V, which is equal to the maximum value of the modulation voltage. Only. Prior art refresh methods require additional voltage withstand voltage from column drive circuits. It was important. Integration is easy due to the low withstand voltage required, and as a result the circuit is less expensive. It can be easily manufactured and operates reliably.

Both drive circuits and paths can also be constructed of the same type. In this case, accumulate The number of types of power circuits is reduced.

Since the 'tlA voltage of the display device does not include a DC voltage component, the lifespan of the display device is grows.

The amplitude of the row selection pulse and column selection pulse is small, and the wave number of the fundamental voltage is set to 2. Since the frequency can be lower than 5 Hz, the power consumption of the display device is low.

The wiring system requires only one high-voltage AC power source, but prior art solutions In the method, up to four pulse sources were generally required. For this reason, the equipment cost is reduced and its reliability is improved.

Hereinafter, the present invention will be explained in further detail with reference to the attached drawings (C, therefore, Embodiment 1). Ru.

No. 11 ¥1 is one wiring system based on the VC of the present invention applied to a 2×2 matrix display. Showing the stem.

FIG. 2 shows the various drive pulses for the wiring system shown in FIG. 1 in a time vortex. It is a graph shown as a number.

In FIG. 1, the display matrix includes rows Xi and X2, columns Y1 and Y2, etc. It consists of Display elements C11, CI2, C21 and C2 are placed at the intersections of rows and columns. 2 is placed. The voltage measured from the X electric field to the Y electric field in the element is "C1l, C12, C2-1U U and It is indicated by UC2□. column (the ground point SE of the pivot circuit SA is connected to the entire drive system) It is preferable that the ground point JE be connected to the ground point JE. The grounding point RE of the row drive circuit RA is an AC It is connected to the AC voltage U generated by the warehouse #, B.

In FIG. 2, the display element C22 is in the corresponding display state at maximum brightness (alternating current The voltage URM across the row drive circuit NRA, which is in series with the voltage UB, is the voltage URM across the row drive circuit SA. Assume that the voltage across the voltage US is equal to Vi. That is, URM=UsM= UM・ Row X2 selects generation of drive voltages for display elements C11, CI2, C21, and C22. Inspect the object at the moment it is in the correct state. When UB is positive, the selected row Receive pressure UB. At the same time, the selected column Y2 is connected to the ground point SE and the selected column The column Yl that was not present is connected to the voltage U8MK. In other words, the positive of the fundamental voltage (U) The amplitude is IAS From the positive peak of the alternating voltage directly UB to the highest value of the column modulation voltage, the row that is not the voltage -U Connected to B+UR Ya. At this time, connect the selected column Y2 to the voltage U8 and Y1. and is equal to the selected selection voltage URIv1 minus the selection voltage URIv1. From Figure 2, ° row selection voltage The pressure U and the highest straightness U8IvI of the column modulation abrasive pressure are the same. When selected (U8M-URM-UM), display elements C, 11, C'l, 2, All voltages of C21 and C22 are alternating voltages, and the peak value is half selected display elements C1l, C12, C2], in the case of display element C22 selected by UB1 In this case, it can be seen that UB+UM. From Figure 2, row X2 receives the selection pulse. Therefore, the display element C12 is selected and, within the scope of the present invention, is different from the above-described embodiment. You can also think of other solutions. That is, unlike the columns in Figures 1 and 2, , the take-off of the fundamental voltage can be reversed more frequently at the peaks of each field. Zhou Wave a can be as high as one cycle per row.

Example 1 of Figures 1 and 2 (in Example 1 of Figures 1 and 2, the row selection voltage UM And the sudden increase in column modulation voltage? [U] is the same height.

3M This can also be done differently. At this time, the symmetry of the drive pulse is By choosing the positive and negative amplitudes of the voltage U to differ by the difference from their value U Ri-V M can hold.

In Figures 1 and 2, unselected lines always indicate the AC voltage U. Phase (C is therefore connected to the positive or negative pole of the row selection voltage RM.Row-selection voltage UR If you select M to be twice the height of the highest value U of column modulation, the selected row will be selected. Unselected rows can float while receiving pulses. So Therefore, power consumption is reduced.

Unlike the example in FIG. Both grounding points RE and SE of the drive circuit SA are unipolar for a grounded system. pulses can be provided in antiphase with respect to each other.

In the examples in Figures 1 and 2, when there are only two brightness levels of the display element, We discussed about it. It is clear that the method according to the invention can be employed in connection with image display. It is. For modulation of burst length and pulse width, for example, as shown in cited document (3), The suggested method Depending on the selection of the corresponding row of viewing angles, one can use the oscilloscope to adjust the brightness. You can also

Engraving (no changes to the content) Procedural amendment (formality) December 6, 1982 Commissioner of the Patent Office Kazuo Wakasugi 1. Display of the incident Showa year application no. Image display devices, especially AC electroluminescent displays 3 Correction method: method of driving the device and its relationship with wiring system performance patent applicant , 1982) Date of the 5th sleeve correction order: November 2, 1986 (Shipping date: November 886, subject to amendment) "drawing" As shown in the attached sheet, we will submit one official drawing.

Claims (1)

[Claims] 1. Based on thin film technology, image display devices consisting of X electrodes and X electrodes, especially A method for driving AC electroluminescent display devices (cll, C12, C21, C22). Therefore, row selection pulses are alternately applied to the X electrodes (XI, X2), and Column modulation pulses corresponding to desired brightness are applied to the X electrodes (Yl, Y2) In the method, At least some of the display elements (C1l, C12, C21XC22) have variable polarity The highest basic voltage (U’) IAS This fundamental voltage is charged to either the row select pulse or the column modulation pulse only. It is insufficient to ignite the display elements (C1l, CI2, C21, C22). The sea urchin has been selected, and Row selection voltage and column modulation kick pressure are based on fundamental voltage (U) These voltages are the fundamental voltage (U) and the row IAS Only the sum of the selection voltage (URM) and the column modulation voltage selects each element to the display state ( C11, C12, C21, C22) 2, AC power #, (B) is the row selection power supply (RM ) The method according to claim 1, in which the exemplary acid 1f is connected in series with (U) is IAS where the AC voltage (UB) is negative is formed by subtracting the row selection voltage (URM) from the alternating voltage (U). , when the AC voltage (UB) is positive, the maximum value of the column modulation voltage (U SM) formed by subtracting SM). 3. Claims in which the AC power source CB> is connected in series to the column modulated power source (S, M) In the method described in item 1, the fundamental voltage (tr' IVi, the alternating current voltage (UB ) is positive, then IAS If so, remove the row selection voltage (U,) from the AC voltage (U) and and if the alternating current voltage (UB) is negative, then the column from the alternating voltage The maximum value of modulation voltage (U) is 8M A method characterized in that it is formed by subtracting. 4. The origin of the fundamental voltage (U) is A claim characterized in that X2) is not inverted until the row selection pulses are sequentially input. The method described in item 1 of the scope. 5 Maximum value M of row selection voltage (U) and column modulation voltage (U　) have the same amplitude when compared with 8M A method according to claim 1, characterized in that: 6 Maximum value M of row selection voltage (U) and column modulation voltage (U　) have different amplitudes when compared, and the drive M The symmetry of dynamic voltages is such that the positive and negative amplitudes of the alternating current voltage (UB) are connected to the row selection voltage (Ui and column Maximum value of modulation voltage (U) RM SM of claims characterized in that they are maintained by selecting them to differ by the difference between The method described in Scope No. 1. 7 Based on thin film technology, a matrix (XI, AC electroluminescent display device (C11, CI2, C21, C22) and a row drive circuit (RA) that alternately applies row selection pulses to the X electrodes (XI, X2); a column drive circuit (S A, ) that applies column modulation pulses to the Y electrodes (Y], Y2); Row selection power supply (RM) RM IVI that generates row selection voltages (U, U) and, and a column modulation source (SM) that generates a column modulation: A voltage. In the wiring system used for applying the method of The row selection type (RM) and column modulation power supply (SM) are composed of DC power supplies, The wiring system is AC city IAS that generates the basic voltage (U) power source (B), which power source (B) is either a row select power source (RM) or a column modulated power source (SM). ) are connected in series with different voltages 'f1. The voltage of (B, RJ SM) is the basic voltage (U　) is symmetrical, and the row selection pulse or column selection IAS To ignite the display elements (C11, C12, C21, C22) with only the modulation pulse While insufficient, the sum of the fundamental voltage (U), row selection voltage, and column modulation take-up pressure to IAS to select each element (C10, C], 2, C21, C22) to the display state. A wiring system that is characterized by being selectively selected. 8. Direct current electrons ( U, U, U) are equal to 1 to RM SM M 8. The wiring system according to claim 7, characterized in that the wiring system is connected at a level. 9. Make sure that the AC power source (B) is connected in series with the row selection source (RIν1). A wiring system according to claim 5 characterized in cuff. 10 Earthing point (SE) of column modulation cable (SM, ) + bow, grounding point (B) of AC Ichihara (B) , , r　I>　) wiring system,