CN101159111A - Plasma display device - Google Patents

Abstract

The invention discloses a plasma display device, comprising a scanning drive circuit for providing drive signal to a scanning electrode of plasma panel; a maintaining drive circuit for providing drive signal to a maintaining electrode; a sensor connected with the substrate capacitance in parallel between the scanning drive circuit and maintaining drive circuit, in order to form resonant circuit together with substrate capacitance; a first switch between the scanning drive circuit and sensor; a second switch between the maintaining drive circuit and sensor. A scanning and maintaining drive energy recovery circuit is formed by a sensor, and the substrate drive efficiency is increased and the output voltage of the drive circuit is stable, therefore the inappropriate shocks is prevented.

Description

Plasma display system

Technical field

The present invention relates to a kind of plasma and show (PlasmaDisplay) device.

Background technology

Usually, plasma display panel is formed a unit string by the barrier that is formed between upper substrate and the lower basal plate, charged into neon (Ne) in each string, helium (He) or, the inert gas of the mixed gas of neon and helium main discharge gases such as (Ne+He) and small amount of xenon (Xe). when discharging by HF voltage, inert gas produces vacuum ultraviolet (VacuumUltravioletrays), makes the light-emitting phosphor that is formed between the barrier, thereby manifests image.Because of this plasma display panel can have frivolous structure, therefore enjoy and gaze at as second generation display device.

In order to drive plasma display panel, need provide the driving circuit of drive signal to each electrode that is formed on substrate.In the substrate driving circuit,, can cause problems such as the maloperation of substrate and circuit damage because of the reasons such as instability of voltage produce when fining away (peaking) electric current.

Summary of the invention

In order to address the above problem, to the purpose of this invention is to provide a kind of stability, thereby prevent to misplace the plasma display system of electricity by raising substrate driving circuit.

Plasma display system of the present invention comprises: the scan drive circuit that drive signal is provided to the scan electrode of plasma display panel; Provide the driving circuit of keeping of drive signal to keeping electrode; In order together to form resonant circuit, at scan drive circuit with keep between the driving circuit sensor in parallel with substrate capacitance with substrate capacitance; Be connected the 1st switch between scan drive circuit and the sensor; And be connected the 2nd switch of keeping between driving circuit and the sensor.

Plasma display system of the present invention is kept the driving energy recovering circuit by utilizing a sensor to form scanner uni, can improve substrate and drive efficient, makes the output voltage stabilization of driving circuit, thereby prevents to misplace.

Description of drawings

Fig. 1 is the oblique view of an example of demonstration plasma display panel structure of the present invention.

Fig. 2 disposes the sectional drawing of an example for plasma panel electrode.

Fig. 3 is divided into the sequential chart that a plurality of son fields (subfield) time-division drives plasma display panel one example for showing with a frame (frame).

Fig. 4 is the sequential chart of each drive signal one example of display driver plasma display panel.

Fig. 5 is the picture of composition one example of the drive plate (board) of display driver plasma display panel.

Fig. 6 is the circuit diagram of an example of reading scan driving circuit and the composition of keeping driving circuit.

Fig. 7 is the circuit diagram of the 1st example of the composition that shows scanning of the present invention/keep driving circuit.

Fig. 8 is the sequential chart of an example of the conversion operations of demonstration driving circuit shown in Figure 7.

Fig. 9 is for showing the circuit diagram of the 2nd example that energy recovering circuit of the present invention is formed.

Embodiment

Below, specifically introduce the present invention with reference to drawings and Examples.

Fig. 1 is the oblique view of an example of demonstration plasma display panel structure of the present invention.

As shown in Figure 1, plasma display panel comprises that the conduct that is formed on the upper substrate 10 keeps the scan electrode 11 of electrode pair and keep electrode 12 Hes, is formed on the addressing electrode 22 on the lower basal plate 20.

Usually, the above-mentioned electrode pair 11,12 of keeping comprises by indium tin oxide (Indium-Tin-Oxide; ITO) the transparency electrode 11a of Zu Chenging, 12a and bus electrode 11b, 12b.Above-mentioned bus electrode 11b, 12b can adopt silver (Ag), bus electrode 11b, 12b that the lamination type of the metal of chromium (Cr) etc. or the lamination type of chromium/copper/chromium (Cr/Cu/Cr) or chromium/aluminium/chromium (Cr/Al/Cr) forms.At this moment, bus electrode 11b, 12b are formed on transparency electrode 11a, the 12a, play and reduce the effect that the higher transparency electrode 11a of resistance, voltage that 12a causes descend.

Simultaneously, in the example of the present invention, keep electrode pair 11,12 and not only can take the structure of lamination of transparent electrode 11a, 12a and bus electrode 11b, 12b, can there be transparency electrode 11a, 12a only to form by bus electrode 11b, 12b yet. this structure is not used transparency electrode 11a, 12a, therefore has and can reduce the advantage that substrate is made unit price. and the bus electrode 11b, the 12b that are used for this structure also can adopt multiple materials such as photosensitive material except the above material of enumerating.

Scan electrode 11 and keep the transparency electrode 11a of electrode 12,12a and bus electrode 11b, arranged extraneous light between the 11c with the outside generation that absorbs upper substrate 10, reduce black matrix" (BlackMatrix, BM) 15 of function with the function of color saturation (Purity) that improves upper substrate 10 and contrast of the interception that reflects.

The black matrix" 15 of an example of the present invention is formed on the upper substrate 10, can be formed on transparency electrode 11a by the 1st black matrix" 15 Hes that are formed on barrier 21 lap positions, 12a and bus electrode 11b, and the 2nd black matrix" 11c between the 12b, 12c forms.At this, the 1st black matrix" 15 and the 2nd black matrix" 11c that is called as black layer or black electrode layer, 12c can form the back physical connection simultaneously in forming process, also can not form simultaneously, does not carry out physical connection.

And, when forming by physical connection, the 1st black matrix" 15 and the 2nd black matrix" 11c, 12c is formed by identical material, can be formed by unlike material when rerum natura is decomposed to form.

Form scan electrode 11 side by side and keep electrode 12 upper substrate 10 laminations upper dielectric layer 13 and diaphragm 14.Accumulation can be carried out the function that electrode pair 11,12 is kept in protection by the charged particle of discharge generation on the upper dielectric layer 13.Diaphragm 14 protection upper dielectric layer 13 prevent the influence of the sputter of the charged particle that produces when it is subjected to gas discharge, improve the release efficiency of 2 electronics.

And addressing electrode 22 is with scan electrode 11 and keep electrode 12 and intersect to form.And, form lower dielectric layer 23 and barrier 21 on the lower basal plate 20 of formation addressing electrode 22.

And lower dielectric layer 23 and barrier 21 surfaces are gone up and are formed luminescent coating.Barrier 21 by vertical barrier 21a and laterally barrier 21b be enclosed shape, the physical division discharge string prevents on the discharge string that ultraviolet ray and visible light by discharge generation be leaked to adjacency.

An example of the present invention not only can adopt barrier shown in Figure 1 21 structures, also can adopt the barrier 21 of multiple shape.For example, can adopt vertical barrier 21a and the horizontal highly different type barrier structures such as difference of barrier 21b, form the channel type barrier structure of the channel (Channel) that can be used as the exhaust passage in the middle of vertical barrier 21a or the horizontal barrier 21b at least one barrier, form the grooved barrier structure of groove (Hollow) on the barrier of at least more than one that vertical barrier 21a or horizontal barrier 21b are central.

At this, if type barrier structures such as differences, then preferably laterally barrier 21b is highly higher, if channel type barrier structure or flute profile barrier structure then are preferably in horizontal barrier 21b and go up formation channel or groove.

Simultaneously, shown in the example of the present invention and introduced R that G and B discharge string are aligned to the situation on the same line respectively, but also can adopt other shapes to arrange.For example, also can adopt R, G and B discharge string are arranged with triangle (Delta) type of rounded projections arranged.And the shape of discharge string not only can adopt quadrangle, also can adopt multiple polygons such as pentagon, sexangle.

And the ultraviolet ray that above-mentioned luminescent coating produces during by gas discharge and luminous produces any visible light in the middle of red (R), green (G) or blue (B).At this, be located at and inject the He+Xe that causes discharge, inert mixed gas such as Ne+Xe and He+Ne+Xe in the discharge space between upper/ lower substrate 10,20 and the barrier 21.

Fig. 2 is the picture of an example of the electrode configuration of demonstration plasma display panel, and a plurality of discharge string of forming plasma display panel as shown in Figure 2 preferably dispose with matrix form.A plurality of discharge string are located at scanning electrode wire (Y1 to Ym) respectively, keep on the cross part of electrode wires (Z1 to Zm) and address electrode lines (X1 to Xn).Scanning electrode wire (Y1 to Ym) can drive successively or simultaneously, and keeping electrode wires (Z1 to Zm) can drive simultaneously.Address electrode lines (X1 to Xn) can be divided into odd lines and even lines drives or drives successively.

Electrode configuration shown in Figure 2 only is an example of the electrode configuration of plasma display panel of the present invention.Therefore, the present invention is not limited to the electrode configuration and the type of drive of plasma display panel shown in Figure 2.For example, two scanning (dualscan) modes that also can adopt central 2 scanning electrode wires of above-mentioned scanning electrode wire (Y1 to Ym) to be scanned simultaneously.And above-mentioned address electrode lines (X1 to Xn) also can be divided into top and the bottom and drive at the core of substrate.

Fig. 3 shows by sequential chart a frame (frame) is divided into a plurality of son fields, carries out the picture of an example of time-division method of driving.Unit frame shows for realizing the time-division tone, can be divided into a certain number of for example 8 son fields (SF1 ..., SF8). and, each son field (SF1, ..., SF8) be divided into reset interval (not shown) and, between addressed area (A1 ..., A8) and, keep the interval (S1 ..., S8).

At this, according to an example of the present invention, at least one field that can be in the middle of a plurality of son fields omit reset interval. for example, reset interval only initial son field or, only in the son field of the center section in the middle of initial son field and whole son field.

Between each addressed area (A1 ..., A8) in, (X) applies display data signal to addressing electrode, applies the corresponding scanning impulse of each scan electrode (Y) successively.

Respectively keep the interval (S1 ..., S8) in, to scan electrode (Y) with keep electrode (Z) and apply alternately and keep pulse, between addressed area (A1 ..., A8) form and cause in each discharge string of wall electric charge and keep discharge.

In the brightness of plasma display panel and the unit frame shared keep discharge range (S1 ..., in S8) to keep the discharge pulse number proportional.When a frame that forms 1 image embodies with 8 son fields and 256 tones, can be in each son field successively according to 1,2,4,8,16,32,64,128 ratios distribute the different pulse numbers of keeping.If will obtain the brightness of 133 tones,, keep discharge behind son field 3 intervals and son field 8 interval each string of interior searching and get final product then in son field 1 interval.

The discharge count of keeping that is assigned to each son field can be according to the variable setting of son field weighted value in APC (AutomaticPowerControl) stage.That is, introduced the example that a frame is divided into 8 son fields among Fig. 3 for example, but can change the quantity of the son field that forms a frame flexibly according to design specification.For example, a frame can be divided into 8 above son fields such as 12 or 16 son fields, drive plasma display panel.

And, be assigned to keeping discharge count and can considering γ feature or substrate properties of each son field, carry out numerous variations.For example, the tone that is assigned to son field 4 can be dropped to 6 from 8, the tone that is assigned to son field 6 is brought up to 34 from 32.

Fig. 4 is for showing in the above-mentioned son field of cutting apart the picture of an example of the drive signal of driving plasma display panel by sequential chart.

Above-mentioned son field comprises: go up at each scan electrode (Y) and form positive polarity wall electric charge, respectively keeping upward pre-replacement (prereset) interval of formation negative polarity wall electric charge of electrode (Z), utilization is in the pre-interval wall CHARGE DISTRIBUTION that forms of resetting, the replacement of the discharge string of all pictures of initialization (reset) interval, select the addressing (address) of discharge string interval and keep selected discharge string keep (sustain) interval.

Resetting, (setup) interval and memory (setdown) are interval to be formed by creating in the interval, and the while is applied with oblique wave (Ramp-up) to all scan electrodes in the above-mentioned establishment interval, in all discharge string fine discharge takes place, and generates the wall electric charge thus.In the above-mentioned memory interval, apply simultaneously from being lower than the following oblique wave (Ramp-down) that the above-mentioned positive polarity voltage of going up the crest voltage of oblique wave (Ramp-up) descends to all scan electrodes (Y), discharge takes place to eliminate in all discharge string, and elimination passes through to create wall electric charge and the central unnecessary electric charge of space charge that discharge generates thus.

In between addressed area, apply the sweep signal (scan) of negative polarity successively to scan electrode, meanwhile apply and positive polarity data-signal (data) to above-mentioned addressing electrode (X).By the wall voltage that generates in voltage difference between said scanning signals (scan) and the data-signal (data) and the above-mentioned replacement interval, address discharge takes place, and select string.Simultaneously, between above-mentioned memory interval and addressed area in, apply the signal that keeps keeping voltage to the above-mentioned electrode of keeping.

Above-mentioned keeping in the interval to scan electrode with keep electrode and alternately apply and keep pulse, at scan electrode with keep between the electrode, kept discharge with the face discharge type.

Drive waveforms shown in Figure 4 is the 1st example that drives the signal of plasma display panel of the present invention, and the present invention is not limited to above-mentioned waveform shown in Figure 4.For example, it is interval to omit above-mentioned pre-replacement, can change the polarity and the voltage level of each drive signal shown in Figure 4 as required, finish above-mentioned keep discharge after, apply the erasure signal of eliminating the wall electric charge to keeping electrode.And, only also can adopt to scan electrode (Y) and keep in the middle of (Z) electrode any to apply and above-mentionedly keep signal and cause that keep separately (singlesustain) that keep discharge drives.

Fig. 5 is the picture of composition one example of the drive plate (board) of display driver plasma display panel.

With reference to Fig. 5, then heat release frame 30 is located at the back side of substrate, discharges behind the heat that absorptive substrate produces in the time of supporting substrate.And, at the back side of heat release frame 30 tellite 40 that applies drive signal is set.Tellite 40 can comprise: the addressing driving circuit (X/BD) 50 that drive signal is provided to the addressing electrode (not shown) of substrate; The scan drive circuit (Y/BD) 60 of drive signal is provided to the scan electrode (not shown) of substrate; To substrate keep that the electrode (not shown) provides drive signal keep driving circuit (Z/BD) 70; Control master controller (Ctrl/BD) 80 Hes of above-mentioned driving circuit; The power-supply unit (PSU) 90 of power supply is provided to each driving circuit.

Addressing driving circuit 50 provides drive signal to the addressing electrode (not shown) that is formed on substrate, only selects the discharge string of discharging in the middle of a plurality of discharge string (not shown) of substrate 10 being formed on.

Addressing driving circuit 50 is according to scan mode or two scan mode separately, be located at the upside of substrate and in the middle of the downside any or be located at both sides simultaneously.

The data I C (not shown) of electric current that control is applied to above-mentioned addressing electrode is set, the electric current that applies in order to control among the above-mentioned data I C and produce a large amount of heats on the addressing driving circuit 50.Therefore, in the addressing driving circuit 50,, heating radiator 100 can be set in order to remove the heat that produces in the above-mentioned control procedure.

As shown in Figure 5, scan drive circuit 60 can comprise scanning retaining plate 62 Hes that are connected with master controller 80, connects the turntable driving plate 64 of scanning retaining plate 62 and substrate 10.

Turntable driving plate 64 can be divided into/following 2 part settings in this example, also can be different with example shown in Figure 5, and single setting or setting are more a plurality of.

Turntable driving plate 64 is provided with the scans I C65 that drive signal is provided to the scan electrode of substrate, and scans I C65 can provide replacement to above-mentioned scan electrode continuously, and scanner uni is kept signal.

Keep driving circuit 70 and provide drive signal to the electrode of keeping of substrate.

Fig. 6 has shown scan drive circuit with the circuit diagram form and has kept the example that driving circuit is formed.

Scan drive circuit of the present invention can comprise keeps drive division, replacement drive division and scans I C.With reference to Fig. 6, then keeping drive division comprises: for the Y_SUS_up switch (Q3) keeping voltage (Vs) and be opened to applying of the scan electrode of substrate (Cp) and, the Y_SUS_down switch (Q4) that is opened for the voltage that will be applied to scan electrode drops to ground voltage.

The replacement drive division comprises: the establishment switch (Q8) that is opened for the establishment signal that rises gradually is provided to scan electrode, (Vy) be connected with reverse voltage, for provide to scan electrode drop to gradually reverse voltage (memory signal Vy) and the memory switch (Q9) that is opened and, form the path switch (Q6) of current path with scan electrode.

Scans I C comprises that (Vsc) is connected with scan voltage source, the scanning _ rising switch (Q10) that is opened in order to apply scanning voltage (Vsc) to scan electrode and, the scanning decline switch (Q11) that provides ground voltage to be opened to scan electrode is provided.

Keeping driving circuit comprises: for to substrate (Cp) keep electrode provide the Z_SUS_UP switch (Q1) keeping voltage (Vs) and be opened and, for the Z_SUS_DOWN switch (Q2) that will be opened to keeping electrode to provide voltage to drop to ground voltage.

As shown in Figure 6, connect sensor (L) between driving circuit and the scan drive circuit keeping, sensor (L) is to the scan electrode of substrate or keep electrode and provide or eliminate when keeping voltage (Vs), forms resonance with the electric capacity (Cp) of substrate.

And, at sensor with keep between the driving circuit and to connect ER switch (Q5), connect diode keeping between voltage source (Vs) and sensor one end.As shown in Figure 6, in the above-mentioned diode, preferably negative electrode (cathod) terminal is connected and keeps voltage source (Vs), and anode (anode) terminal is connected on the contact of ER switch (Q5) and sensor (L).Fig. 7 is for showing scanning of the present invention/keep the composition of driving circuit with the circuit diagram form, only having shown to the scan electrode of substrate (Cp) and having kept electrode provides and keep Voltag driving circuit.

With reference to Fig. 7, then scan/keep driving circuit and apply the Y_sus_up switch of keeping voltage (Vs) and being opened for scan electrode to substrate (Cp), and drop to the Y_sus_dn switch that ground voltage two is opened for the voltage that will be applied to scan electrode, for to substrate (Cp) keep electrode apply the Z_sus_up switch keeping voltage (Vs) and be opened and, in order to be provided to that the voltage of keeping electrode descends ground voltage and the Z_sus_dn switch that is opened.

As shown in Figure 7, scanning of the present invention/keep driving circuit to comprise: sensor (L) and the ER switch in parallel with substrate (Cp) are connected the contact of sensor (L) and ER switch and keep diode (D1) between the voltage source (Vs).

Fig. 8 has shown an example of keeping conversion operations in the interval for shown an example of driving circuit conversion operations shown in Figure 7 with sequential chart.

With reference to Fig. 8, along with being provided to scan electrode and keeping the pulse of keeping of electrode, the Y_sus_up switch, the Y_sus_dn switch, Z_sus_up switch and Z_sus_dn switch are opened or closed.And, above-mentioned keep interval in the state that is opened of ER switch keeping.

In the driving circuit shown in Figure 7, provide the voltage of high level continuously to keeping electrode (Z), when for example keeping voltage (Vs), even the ER switch is closed, electric current also can flow through the parasitic diode (bodydiode) of ER switch, so I _LIt is very big that value can become.That is, when being provided to the magnitude of voltage of the voltage long term maintenance high level of keeping electrode, excess current flows through the 2nd current path that forms sensor, so output voltage can be unstable.

For example, keep applying the z-bias voltage in the electrode and continue to provide when keeping voltage to keeping electrode, excess current flows through the 2nd current path that forms sensor, so the drive signal between addressed area can become unstable.

Fig. 9 is for having shown the 2nd example that energy recovering circuit of the present invention is formed with circuit diagram.In order to prevent the formation of above-mentioned excess current, (ER1 ER2), is connected to sensor (L) two ends will to have the switch of mutually different parasitic diode.

With reference to Fig. 9, then the ER1 switch is connected between sensor (L) end and the scan drive circuit, and the ER2 switch is connected sensor (L) other end and keeps between the driving circuit.

Above-mentioned ER1 switch and ER2 switch only are opened in keeping the interval, keep closed condition in remaining interval.

The parasitic diode of the parasitic diode of ER1 switch and ER2 switch all is that its cathode terminal is connected sensor (L), is connected on the switch with opposite direction.Therefore, electric current is by flowing through above-mentioned two parasitic diodes, keeps the interval except ER1 switch and ER2 switch are opened, and electric current can not flow by the 2nd current path that forms sensor (L).

Plasma display system of the present invention with above-mentioned composition is kept the driving energy recovering circuit by utilizing a sensor to form scanner uni, can improve substrate and drive efficient, makes the output voltage stabilization of driving circuit, thereby prevents to misplace.

The above embodiments only are to belong to for example, and the present invention is not limited to scope for example.Scope of the present invention is by the claim range specification, and from the meaning and the scope of Patent right requirement scope, perhaps all changes of being derived in the equivalent concepts or the form of distortion all belong to scope of the present invention.

Claims (6)

1. a plasma display system comprises upper substrate; Be formed on a plurality of scan electrodes of above-mentioned upper substrate and keep electrode; Lower basal plate with above-mentioned upper substrate arranged opposite; And be formed on the plasma display panel of a plurality of addressing electrodes of above-mentioned lower basal plate, it is characterized in that: it also comprises the scan drive circuit that drive signal is provided to above-mentioned scan electrode; Keep the driving circuit of keeping that electrode provides drive signal to above-mentioned; In order together to form resonant circuit, at above-mentioned scan drive circuit with keep between the driving circuit sensor in parallel with aforesaid substrate electric capacity with aforesaid substrate electric capacity; Be connected the 1st switch between above-mentioned scan drive circuit and the sensor; And be connected above-mentioned the 2nd switch of keeping between driving circuit and the sensor.

2. plasma display system according to claim 1 is characterized in that: above-mentioned the 1st, 2 switch only is opened keeping the interval.

3. plasma display system according to claim 1 is characterized in that: the parasitic diode of above-mentioned the 1st switch is connected in the opposite direction with the parasitic diode of the 2nd switch.

4. plasma display system according to claim 1 is characterized in that: the anode terminal of the parasitic diode of above-mentioned the 1st switch is connected on the above-mentioned scan drive circuit, and cathode terminal is connected on the sensor.

5. plasma display system according to claim 1 is characterized in that: the parasitic diode of above-mentioned the 1st switch is that anode terminal is connected the above-mentioned driving circuit of keeping, and cathode terminal is connected on the sensor.

6. plasma display system according to claim 1 is characterized in that: include to keep and connect cathode terminal in the voltage source, be connected the diode of anode terminal at the sensor with above-mentioned the 2nd make and break contact.

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