CN2300165Y

CN2300165Y - Electroluminescent plate driving device

Info

Publication number: CN2300165Y
Application number: CN 96221286
Authority: CN
Inventors: 彭文琦
Original assignee: Semisilicon Technology Corp
Current assignee: Semisilicon Technology Corp
Priority date: 1996-11-27
Filing date: 1996-11-27
Publication date: 1998-12-09
Anticipated expiration: 2006-11-27

Abstract

The utility model relates to a driving device of an electroluminescent plate, which comprises two triodes connected with emitting electrodes. The electricity collecting electrode of the first triode is connected with one end of a choke coil and a negative pole of a diode, and the positive pole of the diode is connected with the high electric potential contact point of an electroluminescent plate to lift the electric voltage of the high electric potential contact point of the electroluminescent plate. The electricity collecting electrode of the second triode is connected with the high electric potential contact point of the electroluminescent plate through a resistor. When the base electrode of the first triode is low, the utility model provides cathode voltage for the high electric potential contact point and increases the peak value voltage of the electroluminescent plate so as to enhance the lightness and modulate the output power for working to control the consumption current.

Description

The electroluminescent panel drive unit

The utility model relates to the electroluminescent panel drive unit, particularly cooperate high pressure IC simplify outward element, current sinking is reduced and reach the same brightness or the electroluminescent panel drive unit of high brightness more.

In No. 84216630 patent application case of applicant, the principle of luminosity of electroluminescent panel has been described, mainly be to utilize two triodes, second tube sheet and current-limiting resistance and electroluminescent panel to connect and compose a path.Produce the signal that drives electroluminescent panel by a triode that is connected with choking winding, drive another triode again,, make choking winding accumulate electric energy with the AC signal that provides to boost, make the AC signal of the approximate high pressure of electroluminescent panel contact appearance, shinny to drive electroluminescent panel.

But above-mentioned application is not to be optimal structure, and Figure 1A is the primary structure of this application, can produce the high-voltage AC signal of positive polarity at the C point.Electroluminescent panel has very sensitive characteristic for voltage under standard frequency.Voltage is higher, and brightness is brighter.

Certainly by the time that shortens X, the time that increases Y improves in the structure of Figure 1A, and then the C point voltage can increase very highly, but it has following shortcoming, i.e. reverse withstand voltage relevant with diode and triode; If voltage surpasses its withstand voltage, then cause puncture, voltage again can't promote, and power consumption stream increases.

In view of this, the purpose of this utility model is to provide a kind of electroluminescent panel drive unit, produces the voltage of another negative polarity in the X zone, is added on electroluminescent panel upward peak voltage, and the brightness of electroluminescent panel is improved.

To achieve these goals, the utility model practical technical scheme as follows: the driving circuit of this drive unit comprises two triodes, their emitter links to each other, the collector of first triode is connected with an end of a choke coil and the negative pole of a diode, the other end of described choke coil is connected with the ground wire of described electroluminescent panel, the positive pole of described diode is connected to the noble potential contact of electroluminescent panel, and its voltage is promoted; The collector of second triode is connected with the noble potential contact of electroluminescent panel through a resistance; The base stage of described two triodes respectively receives external trigger signal by a resistance, described trigger pip is mutual anti-phase two-way square-wave pulse, so that second triode is the low time at the first transistor base signal, provide the described noble potential contact of a reverse voltage, to increase the peak-peak voltage that is used to improve brightness on the electroluminescent panel to electroluminescent panel.

The utility model passes through said structure, the brightness that has improved electroluminescent panel, and institute's power consumption stream is increased.

Illustrated simple declaration:

Figure 1A is the driving circuit figure of original electroluminescent panel drive unit, and Figure 1B is the oscillogram of each contact in the circuit;

Fig. 2 A is the driving circuit figure of the drive unit of generation negative polarity high pressure, and Fig. 2 B is the oscillogram of each contact in the circuit;

Fig. 3 A is that Fig. 3 B is the oscillogram of each contact in the circuit with the driving circuit figure of the drive unit of Figure 1A and Fig. 2 A circuit be combined into;

Fig. 4 A is the driving circuit figure that replaces the formed drive unit of switching triode among Fig. 3 A with electronic component, and Fig. 4 B is the oscillogram of each contact in the circuit;

Fig. 5 A is the driving circuit figure of the drive unit of another embodiment of the present utility model, and Fig. 5 B is the oscillogram of each contact in the circuit;

Fig. 6 A is the driving circuit figure that replaces the formed drive unit of switching triode among Fig. 5 A with electronic component, and Fig. 6 B is the oscillogram of each contact in the circuit;

Fig. 7 is the simplification drive unit figure of Fig. 6 A, constitutes with a triode;

Fig. 8 is the driving circuit figure that the another kind of Fig. 6 A is simplified drive unit, constitutes with a triode;

Fig. 9 is the oscillogram of each contact in Fig. 7 and Fig. 8 circuit.

See also the structure shown in Fig. 2 A, be a kind of embodiment circuit diagram of the present utility model, this drive unit is connected the noble potential contact C of electroluminescent panel EL with the triode Q1 and the Q2 of two parallel connections; Wherein the collector of first triode Q1 is connected with the negative pole of a choke coil L and a diode D, the contact C of electroluminescent panel EL is made voltage promote; Second triode Q2 then in the first triode Q1 base stage a-signal is low time, provides a reverse voltage, increases the voltage of electroluminescent panel upward peak, to improve brightness.This circuit also can produce the high pressure of negative polarity, and principle is identical with Figure 1A, therefore if Figure 1A is combined with Fig. 2 A, also can achieve the goal.

Desired binding as shown in Figure 3A, the anodal contact C that is connected to electroluminescent panel EL through first on-off element A1 of the diode D1 that wherein is connected with triode A2; The collector of triode B2 is connected with the choke coil L other end, and is connected with the positive pole of diode D2, and the negative pole of this diode, then process on-off element B1 is connected to the contact C of electroluminescent panel.V+ is a low-voltage DC, as DC1.5V or DC3.0V; When the complete conducting of triode A2, triode B2 is that formed structure is as Figure 1A when switching triode, contact C is toward the positive polarity charging, produce the high pressure of positive polarity, this moment, switch A1 need open, and switch B1 need close: when the complete conducting of triode B2, triode A2 is when switching triode, then form Fig. 2 A structure, contact C produces the high pressure of negative polarity toward the negative polarity charging, this moment, switch A1 need close, and switch B1 need open.By oscillogram as can be known, so promptly successfully reached the set goal.

In addition, replace switch A1 and B1 as electronic component how, and reach the purpose of ICization, see also the drive unit example shown in Fig. 4 A, wherein the switch electronic loop of representing with a1 and b1 has replaced switch A1 and the B1 of Fig. 3 A, just can successfully reach complete structure.Oscillogram by experimental result gained among the figure also is confirmed.

Shown in Fig. 5 A, be another embodiment of the present utility model, can reach same purpose.Two contact F, E at electroluminescent panel EL connect one group of drive unit respectively, first group of drive unit has first and second triode Q1 and the Q2 of serial connection, the first diode D1 is connected between the collector of the collector of the first triode Q1 and the second triode Q2 and the negative pole of the first diode D1 is connected to the positive pole of another diode Q11 and the end of choke coil L, the negative pole of this diode D11 is connected with the collector of the 5th triode Q5 and the contact F of electroluminescent panel EL then through behind the first on-off element SW1.Second group of drive unit has the 3rd and the 4th triode Q3 and Q4 of serial connection, diode D2 is connected between the collector of the collector of the 3rd triode Q3 and the 4th triode Q4, and the negative pole of this diode D2 is connected to the positive pole of another diode D22 and the other end of choke coil L, after the negative pole of diode D22 then passes through second switch element SW2, be connected with the collector of the 6th triode Q6 and the contact E of electroluminescent panel.Drive unit among this figure is difference end E and the F that is added in electroluminescent panel EL with the high pressure of positive polarity alternately, and the voltage difference that in fact causes the electroluminescent panel two ends is VE-VF, and by oscillogram relatively, its effect also is equivalent to the drive unit of Fig. 4 A.In like manner, high pressure that can also negative polarity is added in the two ends of electroluminescent panel alternately, also can reach the effect of Fig. 4 A.

The control signal of all structures mentioned above, Figure 1B, 2B, 3B, the B of 4B, and the switch pulse during its start of A, C of the B of Fig. 5 B, D and Fig. 6 B all can be modulated its output power with the control current sinking.Diode D1 and the D2 of Fig. 5 A, it is not omissible element, fundamental purpose is when triode Q1 turn-on transistor Q4 is the switching triode, the pulse signal of high pressure all appears in G and H entirely, if there is not D1, then triode Q1 is the positive-negative-positive triode, when pulse signal is higher than the voltage of contact A and PN junction forward voltage, to cause C, the conducting of the B utmost point of triode Q1, pass through B, the conducting of the E utmost point again to the V+ (V of general triode _BEOAnd little), meaning is that pulse signal will be by the V+ clamp, the F point can't produce high voltage.And after adding D1, promptly completely cut off this converse electrical leakage phenomenon with this diode, overcome this problem.

In the same manner, the effect of diode D2 is also similar to diode D1.Triode Q5 and Q6 are mainly used in discharge, and when E or F point boosted to the summit, two triodes discharged it thus, so cause AC signal, please refer to the oscillogram shown in the 5B.

More than shown in, be the comparatively ideal embodiment of the utility model.Also can be by high pressure resistant IC with this circuit integration, miniaturization, and cooperate functional variation, and run lamp etc. as postponing, glimmering, it is blended in a slice application-specific integrated circuit, then can enlarge range of application.

On-off element SW1 and SW2 among same Fig. 5 A can also replace by electronic component, reach integrated purpose, with reduction volume, replacement circuit as shown in Figure 6.

The circuit diagram that Fig. 7 provided, Fig. 5 A is simplified, wherein the first triode Q1, the second triode Q2, the first diode D1, the 3rd triode Q3, the 4th triode Q4, the second diode D2 are simplified to a triode Q, the collector of this triode is connected with choke coil L, and is connected with above-mentioned two change-over switches through a diode D.And the simplification circuit that Fig. 8 provided is to replace with a triode Q, and the collector of this triode is connected with choke coil, and is connected with above-mentioned two change-over switches through a diode.

Claims

1. electroluminescent panel drive unit, it is characterized in that, the driving circuit of this drive unit comprises two triodes, their emitter links to each other, the collector of first triode is connected with an end of a choke coil and the negative pole of a diode, the other end of described choke coil is connected with the ground wire of described electroluminescent panel, and the positive pole of described diode is connected to the noble potential contact of electroluminescent panel, and its voltage is promoted; The collector of second triode is connected with the noble potential contact of electroluminescent panel through a resistance; The base stage of described two triodes respectively receives external trigger signal by a resistance, described trigger pip is mutual anti-phase two-way square-wave pulse, so that second triode at the first transistor base signal when low, provide the described noble potential contact of a reverse voltage, to increase the peak-peak voltage that is used to improve brightness on the electroluminescent panel to electroluminescent panel.

2. electroluminescence drive unit, it is characterized in that, the driving circuit of this drive unit comprises two triodes, the collector of first triode is connected with an end of a choke coil and the negative pole of first diode, the positive pole of described first diode is connected to the noble potential contact of electroluminescent panel through first change-over switch; The collector of second triode is connected with the positive pole of the other end of described choking winding and second diode, and the negative pole of this second diode is connected to the described noble potential contact of electroluminescent panel through second change-over switch; The base stage of described two triodes respectively receives external trigger signal by a resistance, and described trigger pip is mutual anti-phase two-way square-wave pulse.

3. according to the described electroluminescent panel drive unit of claim 2, it is characterized in that described first and second change-over switch is by the electronic component of circuit integration can being constituted.

4. electroluminescent panel drive unit, it is characterized in that, two contacts of the electroluminescent panel that driving circuit drove of this drive unit, connect one group of driving circuit respectively, first group of driving circuit has first and second triode (Q1) of serial connection and (Q2), first diode (D1) is connected between the collector of the collector of first triode (Q1) and second triode (Q2) and the negative pole of first diode (D1) is connected to an end of an anodal and choke coil of another diode (D11), the negative pole of this diode (D11) is connected with the collector of the 5th triode (Q5) and the contact (F) of electroluminescent panel then through behind first on-off element (SW1); Second group of driving circuit has the 3rd and the 4th triode (Q3) of serial connection and (Q4), second diode (D2) is connected between the collector of the collector of the 3rd triode (Q3) and the 4th triode (Q4), and the negative pole of second diode (D2) is connected to the other end of the anodal and above-mentioned choke coil of another diode (D22), after the negative pole of this diode (D22) then passes through second switch element (SW2), be connected with the collector of the 6th triode (Q6) and the contact (E) of electroluminescent panel; The base stage of described all triodes receives trigger pip by a resistance respectively, the base stage of wherein said triode (Q1, Q6) and (Q3, Q5) is added with trigger pip (A) respectively and reaches (C), and it (C) is mutual anti-phase two-way square-wave pulse that trigger pip (A) reaches; Described triode (Q2) and (Q4) base stage add trigger pip (B) respectively and (D) are that anti-phase two-way square-wave pulse mutually, described signal (A) reach that (B) then phase place is identical.

5. according to the described electroluminescent panel drive unit of claim 4, it is characterized in that described first and second change-over switch is made of electronic component.

6. according to the described electroluminescent panel drive unit of claim 4, it is characterized in that, described first triode (Q1), second triode (Q2), first diode (D1), the 3rd triode (Q3), the 4th triode (Q4), second diode (D2) are substituted by a triode, the collector of this triode is connected with an end of choke coil, and be connected with above-mentioned two on-off elements through a forward diode, the other end of described choke coil is connected to power supply.

7. according to the described electroluminescent panel drive unit of claim 4, it is characterized in that, described first triode (Q1), second triode (Q2), first diode (D1), the 3rd triode (Q3), the 4th triode (Q4), second diode (D2) are substituted by a triode, the collector of this triode is connected with an end of choke coil, and be connected with above-mentioned two on-off elements through a backward dioded, the other end of described choke coil is connected to ground wire.