CN1248183C - Driving method of plasma display - Google Patents

Abstract

A method for driving a plasma display is disclosed. The plasma display comprises at least a first electrode and a second electrode. The driving method comprises the following steps. First, a first voltage V1 is input to the first electrode. Then, in a first time period, a second voltage V2 is input to the second electrode. The second voltage is greater than the first voltage, so that the voltage difference between the first electrode and the second electrode is a first voltage difference D2, and the second voltage difference D1 is V2-V1. Afterwards, in a second time period, a third voltage V3 is input to the second electrode. The third voltage is less than the first voltage, so that the voltage difference between the first electrode and the second electrode is a second voltage difference D2, and the second voltage difference D2 is V3-V1.

Description

Driving method of plasma display

Field of Invention

The invention provides a method for driving a plasma display in a sustaining phase, in particular a method for driving a plasma display in a sustaining phase which can simplify circuit elements.

Background Note

Plasma display panel (plasma display panel) is large and thin, and has no radiation, so it will be the mainstream of large-size displays in the future. A plasma display includes a plurality of plasma display units arranged in a matrix, and an inert gas is sealed therein. The plasma display is driven by a driving circuit according to a certain driving sequence (driving sequence), so that the inert gas in it is excited and ionized to discharge and emit light. The circuit characteristics of the plasma display can be roughly regarded as a capacitive load. The driving principle is to provide current to charge the capacitor, and to apply high-voltage and high-frequency alternating current across the capacitor to make the plasma in the plasma display unit The charge of the body is driven back and forth, and ultraviolet rays are emitted during the driving process to excite the fluorescent agent on the wall of the device to emit light.

Please refer to FIG. 1 , which is a schematic diagram of a conventional plasma display 10 . The conventional plasma display 10 includes a rear panel 12 and a transparent front panel 14 installed in parallel. The lower side of the front plate 14 is provided with a plurality of sustaining electrode pairs (electrode pair) 16, each sustaining electrode pair 16 includes two sustaining electrodes 18, 19, and each sustaining electrode 18, 19 is a long strip with a fixed width. . A dielectric layer 20 is disposed on the lower side of the front plate 14 and covers the pair of sustain electrodes 16 for providing capacitance required for AC driving to prevent electric breakdown. A protective layer 22 is disposed on the lower side of the dielectric layer 20 and is usually made of magnesium oxide (MgO) for protecting the dielectric layer 20 from degradation caused by plasma sputtering. The rear plate 12 is provided with a plurality of barrier ribs (rib) 24, a plurality of data electrodes (data electrode) 26, and blue, red and green phosphors (phosphor) 30B, 30R, 30G are sequentially filled into the barrier ribs. Between the walls 24. Discharge gas is filled between every two adjacent barrier walls 24. A plurality of barrier walls 24 can prevent the plasma on the two sides of the barrier walls 24 from flowing and interfering with each other.

The sustain electrodes 18 and 19 of the plasma display 10 are also called X and Y sustain electrodes (X, Y sustain electrode). The X and Y sustain electrodes 18 and 19 are wide and nearly transparent conductors, usually made of indium tin oxide (ITO), for initiating and sustaining discharges. The X and Y sustain electrodes 18, 19 each include an auxiliary electrode (bus electrode) 36, 38 disposed on the lower side thereof. Auxiliary electrodes 36, 38 are thin and opaque metal wires, usually made of chromium-copper-chromium three-layer metal, used to assist X, Y sustain electrodes 18, 19 to initiate discharge, and lower X, Y sustain electrodes 18, 19 resistance.

As shown in FIG. 1 , every pair of barrier ribs 24 and sustain electrodes 16 defines a sub-pixel unit 32B, 32R, or 32G. Three sub-pixel units 32B, 32R, 32G form a pixel unit (pixel unit) 34 . The sub-pixel units 32B, 32R, 32G and the pixel unit 34 are the areas included below the dotted line shown in FIG. 1 . When a driving voltage is applied between the X, Y sustain electrodes 18, 19 and data electrodes 26 in each sub-pixel unit 32B, 32R, 32G, an electric field will be formed, which will cause ionized gas discharge to generate ultraviolet rays, and irradiate the phosphor 30B, 30R, or 30G to emit light.

Please refer to FIG. 2 , which is a timing diagram of the driving program of the plasma display 10 shown in FIG. 1 . In a known plasma display, a series of driving pulses are applied to each pixel unit according to a predetermined normal driving program to form a group of image display pulses, and finally achieve the purpose of displaying images. Taking the pixel unit 34 shown in FIG. 1 as an example, the normal driving program can usually be divided into the following stages: (a) reset period (reset period), (b) address period (address period), (c) maintenance period (sustain period). When the pixel unit 34 is in the reset phase, a voltage is applied to the X and Y sustain electrodes 18, 19. The purpose of this phase is to keep the states of the wall charges (wall charge) on the surface of the sustain electrodes consistent, so that in the subsequent addressing The image data can be correctly written into the predetermined address in the stage, and the inert gas in the plasma display unit is excited and ionized to discharge and emit light in the sustain stage to display the image. At this time, due to the ionization phenomenon generated by the inert gas, the pixel unit of the plasma display is in a stable and easy-to-excite state. The driving methods of the conventional addressing phase and the sustaining phase are well known to those skilled in the art and will not be repeated here. Each stage in the above-mentioned normal driving procedure is repeated, so that each pixel unit of the plasma display is driven by different image display pulses, so that the user can see the corresponding image frame presented on the display panel of the plasma display. For example, the known driving method of a plasma display in the maintenance phase is disclosed in US Pat. No. 4,866,349 "power efficient sustainable drivers and address drivers for plasmas panel", which respectively maintain the X and Y electrodes 18, 19 A pulse is applied to drive the inert gas to stimulate ionization and discharge to emit light.

Please refer to FIG. 3 . FIG. 3 is a schematic diagram of the driving circuit 40 of the plasma display 10 shown in FIG. 1 . The driving circuit 40 includes capacitors C1, C2, Cp, inductors L1, L2, switches Q1, Q2, Q3, Q4, Q5, Q6, and a voltage source Vs (the output voltage is V volts). Please note that since the plasma display 10 includes a dielectric layer 20 disposed between the rear plate 12 and the transparent front plate 14, the characteristic of the circuit formed between the sustain electrodes 18, 19 can be regarded as a capacitance Cp. When the switch Q2 is turned on, the voltage source Vs can input the current into the capacitor Cp through the switch Q2, but when the switch Q2 is off, the voltage source Vs cannot input the current into the capacitor Cp through the switch Q2. The two terminals X and Y of the capacitor Cp are respectively connected to the sustain electrode 18 and the sustain electrode 19, and the capacitors C1, C2, Cp and the inductors L1 and L2 form a resonant circuit (resonant circuit) so that the voltage of the two terminals X and Y of the capacitor Cp Oscillating changes are generated, so the drive circuit 40 can simultaneously change the voltages input to the X sustain electrode 18 and the Y sustain electrode 19 by changing the voltages at the two terminals X and Y of the capacitor Cp. In addition, according to the characteristics of the resonant circuit, the voltage difference between the capacitors C1 and C2 is equal to half of the output voltage of the voltage source Vs, which is 1/2V volts. If the voltage difference between the capacitors C1 and C2 is not equal to half of the output voltage of the voltage source Vs , the energy change will be caused during the operation of the resonant circuit, and the reason will be described in detail later.

Please refer to FIG. 3 and FIG. 4 . FIG. 4 is a timing diagram of the plasma display 10 shown in FIG. 3 in the sustain phase. Before the known plasma display 10 enters the maintenance phase, each switch Q1, Q2, Q3, Q4, Q5, and Q6 is in a non-conducting state, and the voltage difference between the capacitors C1 and C2 is 1/2V. At this time, the capacitor Cp is two The voltage difference across the terminals is 0. Then, the switches Q1 and Q5 are turned on so that the voltage at the terminal X oscillates from 0 to V (with 1/2V as the turning point). Then the switch Q1 is turned off, the switch Q2 is turned on and the switch Q5 is kept on, so that the voltage of the terminal X is kept at V. Then the switch Q1 is turned on, the switch Q2 is turned off, and the switch Q5 is kept on, so that the voltage of the terminal X oscillates from V to 0 (with 1/2V as the turning point), and at this time the terminal X has generated a pulse. Then the switch Q5 is turned off and the switches Q3 and Q6 are turned on, then the voltage of the terminal Y oscillates from 0 to V (with 1/2V as the turning point). Then the switch Q6 is turned off, the switch Q4 is turned on and the switch Q3 is kept on, so that the voltage of the terminal Y is kept at V. Then the switch Q4 is turned off, the switch Q6 is turned on and the switch Q3 is kept on, so the voltage of the terminal V oscillates from V to 0 (1/2V is the turning point). Finally, the switches Q3 and Q6 are turned off, and the terminal Y has generated a pulse at this time. If the voltage difference between the two ends of the capacitor C1 is less than 1/2V, when the transistors Q1 and Q5 are turned on to increase the voltage of the terminal X, the voltage of the driving circuit is less than 1/2V (provided by the capacitor C1), and then, when the switches Q1 and Q5 are turned on When the voltage of the terminal X drops, the voltage of the driving circuit is greater than 1/2V (provided by the voltage difference between the voltage source Vs and the capacitor C1), so the outflow energy of the capacitor C1 is less than the inflow energy. Conversely, if the voltage difference across the capacitor C1 is greater than 1/2V, its outgoing energy is greater than its incoming energy. Therefore, in order to maintain a stable state, the voltage difference between the two ends of the capacitor C1 must be equal to 1/2V. Similarly, when the capacitor C2 is in a stable state, the voltage difference between its two ends is also equal to 1/2V. When the drive circuit 40 is used to provide the pulses required by the sustain electrodes 18 and 19, in order to respectively generate a pulse whose voltage oscillates from 0 to V and then oscillates from V to 0 for the sustain electrodes 18 and 19, the known plasma display 10 must A resonant circuit is designed to drive the sustain electrodes 18 and 19 respectively. Therefore, more circuit components, such as capacitors, inductors, and transistors, must be used, so the production cost is not easy to reduce.

Contents of Invention

Therefore, the main purpose of the present invention is to provide a method for driving a plasma display with simplified circuit elements, which can reduce production costs.

The invention relates to a method for driving a plasma display. The plasma display at least includes a first electrode and a second electrode, and the driving method includes the following steps. First, a first voltage V1 is input to the first electrode. Then, within a first period of time, a second voltage V2 is input to the second electrode, the second voltage is greater than the first voltage, so that the voltage difference between the first electrode and the second electrode is a first voltage difference D1, and The first voltage difference D1 is V2-V1. Afterwards, within a second period of time, a third voltage V3 is input to the second electrode, the third voltage is lower than the first voltage, so that the voltage difference between the first electrode and the second electrode is a second voltage difference D2, and the first electrode The voltage difference D2 is V3-V1.

Description of drawings

FIG. 1 is a schematic diagram of a conventional plasma display.

FIG. 2 is a timing diagram of a driving program of the plasma display shown in FIG. 1 .

FIG. 3 is a schematic diagram of a driving circuit of the plasma display shown in FIG. 1 .

FIG. 4 is a timing diagram of the sustain phase of the plasma display shown in FIG. 1 .

FIG. 5 is a schematic diagram of a driving circuit of the first plasma display of the present invention.

FIG. 6 is a first circuit schematic diagram of the driving circuit shown in FIG. 5 .

FIG. 7 is a timing diagram of the driving circuit shown in FIG. 6 in a sustain phase.

8 to 9 are equivalent circuit diagrams of the driving circuit shown in FIG. 6 .

FIG. 10 is a second circuit schematic diagram of the driving circuit shown in FIG. 5 .

FIG. 11 is a schematic diagram of a driving circuit of a second plasma display according to the present invention.

FIG. 12 is a schematic diagram of a driving circuit of a third plasma display according to the present invention.

FIG. 13 is a schematic diagram of a driving circuit of a fourth plasma display according to the present invention.

FIG. 14 is a schematic diagram of a driving circuit of a fifth plasma display according to the present invention.

FIG. 15 is a schematic diagram of a driving circuit of a sixth plasma display according to the present invention.

FIG. 16 is a timing diagram of the driving circuit of FIG. 15 .

Explanation of the symbols in the attached drawings

10 Plasma Display 12 Rear Panel

14 Front Plate 16 Sustaining Electrode Pairs

18, 19 Sustaining electrode 20 Dielectric layer

22 Protective layer 24 Barrier wall

26 data electrode 30G green phosphor

30R Red Phosphor 30B Blue Phosphor

32G, 32R, 32B sub-pixel unit 34 pixel unit

36, 38 Auxiliary electrodes

40, 50, 80, 92, 105, 108, 112, 140 drive circuit

52, 81, 93, 94, 113 Inductance

54, 82, 95, 126, 127, 128 Capacitance

56, 58, 60, 62, 83, 84, 85, 86, 96, 97, 98, 99, 114,

115, 116, 117, 118, 119, 120, 121 Transistors

64, 66, 122, 123, 124, 125, 132, 133 Body diode

87, 88, 100, 101 Diodes

68, 70, 72, 89, 90, 91, 102, 103, 104, 109, 110, 106,

107, 129, 130, 131 Voltage source

Detailed ways

Please refer to FIG. 5 . FIG. 5 is a schematic diagram of a driving circuit 50 of the first plasma display of the present invention. The driving circuit 50 includes an inductor L3, a capacitor C, switches S1, S2, S3, and three voltage sources V', V ", V''. For realizing the driving circuit 50 shown in Fig. 5, please refer to Fig. 6, Fig. 6 It is the first schematic diagram of the drive circuit 50 shown in Figure 5. As shown in Figure 6, the drive circuit 50 includes an inductor 52, a capacitor 54, four transistors 56,58,60,62, two diodes 64,66 , and three voltage sources 68, 70, 72. When a current flows through the inductance 52, the inductance 52 and the capacitor 54 are connected in series to form a resonant circuit, and the transistors 56, 58, 60, 62 can control their conduction states as Switch (switch) to control the direction of current conduction. For example, when the transistor 60 is turned on, the voltage source 68 can output current to flow into the capacitor 54 through the transistor 60. Diodes 64, 66 are body diodes formed by the structure of the transistors 56 and 58 themselves (body diode), therefore utilize diode 64,66 and transistor 56,58 to form a bidirectional switch (bi-directional switch) in the present embodiment and can control the direction that electric current flows through.When transistor 56 conduction, the inductance 52 The output current can flow into the ground terminal (ground) through the diode 66 and the transistor 56. Similarly, when the transistor 58 is turned on, the output current at the ground terminal can flow into the inductor 52 through the diode 64 and the transistor 58, and the voltage sources 68, 70, 72 are Provide a stable voltage to make the drive circuit 50 run. Voltage source 72 provides a first voltage V1. Voltage source 68 provides a second voltage V2, and the second voltage is positive voltage (V2 volts). Voltage source 70 provides a third Voltage V3, and the third voltage is a negative voltage (V3 volts, V3 is a negative value). In addition, the first voltage V1 provided by the voltage source 72 is applied to the sustain electrode 19, and the first voltage is any voltage between the second voltage and the voltage value between the third voltage (V1 volts, V3<V1<V2). The circuit characteristics caused between the sustain electrodes 18 and 19 can be regarded as a capacitor 54, so the terminal A of the capacitor 54 is the sustain electrode 18, The terminal B of the capacitor 54 is the sustain electrode 19 .

Please refer to FIG. 7 to FIG. 9 , FIG. 7 is a timing diagram of the driving circuit 50 shown in FIG. 6 in the maintenance phase, and FIGS. 8 to 9 are equivalent circuit diagrams of the driving circuit 50 shown in FIG. 6 . Assume that at the beginning, only the transistor 60 is turned on in the driving circuit 50, so the voltage at the terminal A of the capacitor 54 is the second voltage (V2 volts) provided by the voltage source 68, and the voltage at the terminal B of the capacitor 54 is the voltage source 72 The first voltage (V1 volts) is provided, so the potential difference across the capacitor 54 is the first voltage difference D1, and D1 is V2-V1 volts, as shown in the first period of time in FIG. 7 . Then, turn off the transistor 60 and turn on the transistor 56, then the capacitor 54 is connected in series with the inductor 52, and forms a resonant circuit through the diode 66 and the transistor 56, its equivalent circuit is shown in Figure 8, the terminal A of the capacitor 54 is close to The ground voltage of 0 volts is the turning point bias voltage, which oscillates downward from V2-V1 volts to -(V2-V1) volts, so the voltage across the capacitor 54 changes from V2-V1 volts to -(V2-V1) volts, as shown in Figure 7 shown in the third period of . Then, the transistor 56 is turned off and the transistor 62 is turned on, so the terminal A of the capacitor 54 is clamped at the third voltage (V3 volts) provided by the voltage source 70, so the potential difference across the capacitor 54 will become the second voltage difference D2, D2 is V3-V1 volts (negative value), as shown in the second period of FIG. 7 . Then, turn off the transistor 62 and turn on the transistor 58, then the capacitor 54 and the inductor 52 are connected in series, and form a resonant circuit through the diode 64 and the transistor 58. -V1 volts change to -(V3-V1) volts (positive value), as shown in the fourth period of FIG. 7 . Afterwards, the transistor 58 is turned off and the transistor 60 is turned on, so the voltage at the terminal A of the capacitor 54 becomes the second voltage (V2 volts) provided by the voltage source 68, so the potential difference between the two ends of the capacitor 54 remains V2-V1 volts, As shown in the fifth period of time in FIG. 7 . Repeating the above steps, the driving circuit 50 of the present invention can generate a pulse at the terminal A of the capacitor 54. Although the terminal B of the capacitor 54 is maintained at the first voltage (V1 volt) by the voltage source 72, the voltage oscillation change through the terminal A can promote the maintenance The voltage difference between electrode 18 and sustain electrode 19 changes.

Please refer to FIG. 10 , which is a second schematic diagram of the driving circuit 50 shown in FIG. 5 . The driving circuit 80 includes an inductor 81 , a capacitor 82 , four transistors 83 , 84 , 85 , 86 , two diodes 87 , 88 , and three voltage sources 89 , 90 , 91 . The voltage source 89 provides a second voltage (V2 volts) of a positive voltage, the voltage source 90 provides a third voltage (V3 volts, V3<0) of a negative voltage, and the voltage source 91 provides any voltage between the second voltage and the third voltage. A first voltage between voltages (V1 volts, V3<V1<V2). The transistor 85 is the first switch S1, and the transistor 86 is the second switch S2. In addition, the diode 87 is connected in series with the transistor 83, the diode 88 is connected in series with the transistor 84, and the series connection of the diode 87 and the transistor 83 and the series connection of the diode 88 and the transistor 84 form a parallel circuit as the third switch S3 to control the flow direction of the current. . The first voltage difference D1 is V2-V1, and the second voltage difference D2 is V3-V1. The oscillating change of the voltage through the terminal A can cause the voltage difference between the sustain electrode 18 and the sustain electrode 19 to change, so that the voltage difference across the capacitor 82 oscillates between the first voltage difference D1 and the second voltage difference D2 . In this embodiment, the driving waveform of the voltage difference across the capacitor 82 is the same as the driving waveform of the voltage difference across the capacitor 54 of the drive circuit 50 of the first plasma display, as shown in FIG. 7 .

Please refer to FIG. 5 and FIG. 11 . FIG. 11 is a schematic diagram of a driving circuit 140 of a second plasma display of the present invention. The driving circuit 140 shown in FIG. 11 adds a capacitor C' to the driving circuit 50 shown in FIG. And the length of the conduction time of the switch S3. In this way, the voltage difference across the capacitor 54 does not take the ground voltage (0 volts) as the turning point, and oscillates downward from V″-V′ volts to V-V′ volts. The limiting conditions of the voltages V″, V′′ are the same as those described in the previous embodiments.

Please refer to FIG. 12 . FIG. 12 is a schematic diagram of a driving circuit 92 of a third plasma display according to the present invention. The driving circuit 92 includes two inductors 93 , 94 , a capacitor 95 , four transistors 96 , 97 , 98 , 99 , two diodes 100 , 101 , and three voltage sources 102 , 103 , 104 . The voltage source 102 provides a positive second voltage (V2), the voltage source 103 provides a negative third voltage (V3, V3<0), and the voltage source 104 provides any voltage between the second voltage and the third voltage. The first voltage between (V1, V3<V1<V2). The transistor 98 is the first switch S1, and the transistor 99 is the second switch S2. In addition, the inductor 93, the diode 100 and the transistor 96 form a series circuit, serving as a third switch S3 (not shown in the figure). The inductor 94, the diode 101 and the transistor 97 also form a series circuit, serving as a fourth switch S4 (not shown in the figure). The inductor 93, diode 100, and transistor 96 connected in series, and the inductor 94, diode 101, and transistor 97 connected in series form a parallel circuit to be used as a switch to control the flow direction of the current. The third switch controls the voltage across the capacitor 95 to oscillate downward from V2-V1, and the fourth switch controls the voltage across the capacitor 95 to oscillate upward from V3-V1. Since the change of the voltage across the capacitor 95 is controlled by different switches, the slopes of the downward oscillation and the upward oscillation may be different. The first voltage difference D1 is V2-V1, and the second voltage difference D2 is V3-V1. The oscillating change of the voltage through the terminal A can drive the voltage difference between the sustain electrode 18 and the sustain electrode 19 to change, so that the voltage difference across the capacitor 95 oscillates between the first voltage difference D1 and the second voltage difference D2 . In this embodiment, the driving waveform of the voltage difference across the capacitor 95 is the same as the driving waveform of the voltage difference across the capacitor 54 in the drive circuit 50 of the first plasma display.

Please refer to FIG. 13 . FIG. 13 is a schematic diagram of a driving circuit 105 of a fourth plasma display of the present invention. The driving circuit 105 includes an inductor 81 , a capacitor 82 , four transistors 83 , 84 , 85 , 86 , two diodes 87 , 88 , and five voltage sources 89 , 90 , 91 , 106 , 107 . Voltage source 89 provides a positive voltage and voltage source 90 provides a negative voltage. In addition, the voltage source 89 provides a second voltage (V2, V2>0), the voltage source 90 provides a third voltage (V3<0), and the voltage source 91 provides any first voltage between the second voltage and the third voltage. A voltage (V1, V3<V1<V2). The transistor 85 is the first switch S1, and the transistor 86 is the second switch S2. The diode 87 is connected in series with the transistor 83 to form the third switch S3, and the diode 88 is connected in series with the transistor 84 to form the fourth switch S4 (S1, S2, S3, S4 are not shown in the figure). In this embodiment, when only the transistor 85 is turned on in the driving circuit 105 , the voltage at the terminal A of the capacitor 82 remains at the first voltage V1 provided by the voltage source 89 . Then, the transistor 85 is turned off and the transistor 83 is turned on. At this time, the driving circuit 105 forms a resonant circuit. Due to the relationship of the voltage source 106, the voltage at the terminal A of the capacitor 82 will not oscillate downward with the ground voltage as a turning point. Similarly, when only the transistor 86 is turned on in the drive circuit 105, the voltage at the terminal A of the capacitor 82 remains at the third voltage V3 provided by the voltage source 90, and then the transistor 86 and the transistor 84 are turned off. 105 forms a resonant circuit. Due to the relationship of the voltage source 107, the voltage at the terminal A of the capacitor 82 will not oscillate upwards with the ground voltage as the turning point. Compared with the driving circuit 80 in FIG. 10, which is close to the ground voltage (0 volts) as the turning point of oscillation, this embodiment uses a voltage source 106 to provide the turning point bias of the downward oscillation, and uses a voltage source 107 to provide the upward oscillation. Therefore, this embodiment can drive the voltage at the terminal A of the capacitor 82 not to oscillate with zero voltage as the turning point. The first voltage difference D1 is V2-V1, and the second voltage difference D2 is V3-V1. The oscillating change of the voltage through the terminal A can drive the voltage difference between the sustain electrode 18 and the sustain electrode 19 to change, so that the voltage difference across the capacitor 95 oscillates between the first voltage difference D1 and the second voltage difference D2 .

Please refer to FIG. 14 . FIG. 14 is a schematic diagram of a fifth plasma display driving circuit 108 of the present invention. The driving circuit 108 includes two inductors 93 , 94 , a capacitor 95 , four transistors 96 , 97 , 98 , 99 , two diodes 100 , 101 , and five voltage sources 102 , 103 , 104 , 109 , 110 . The voltage source 102 provides a positive second voltage (V2, V2>0) and the voltage source 103 provides a negative third voltage (V3, V3<0). In addition, the voltage source 104 provides any first voltage between the second voltage and the third voltage (V1, V3<V1<V2). Transistor 98 is a first switch, and transistor 99 is a second switch. In addition, the inductor 93 , the diode 100 and the transistor 96 form a series circuit and constitute the third switch. The inductor 94 , the diode 101 and the transistor 97 also form a series circuit and constitute the fourth switch to control the flow direction of the current. As disclosed in the driving circuit 105 of the fourth type of plasma display of the present invention, compared with the driving circuit 92 of the third type of plasma display shown in FIG. To provide the turning point bias for downward oscillation, and use a voltage source 110 to provide the turning point bias for upward oscillation, so this embodiment can drive the voltage of the terminal A of the capacitor 95 not to oscillate with zero voltage as the turning point. The first voltage difference D1 is V2-V1, and the second voltage difference D2 is V3-V1. The oscillating change of the voltage via the terminal A can cause the voltage difference between the sustain electrode 18 and the sustain electrode 19 to change, so that the voltage difference across the capacitor 95 oscillates between the first voltage difference D1 and the second voltage difference D2 .

Please refer to FIG. 15 and FIG. 16 , FIG. 15 is a schematic diagram of the driving circuit 112 of the sixth plasma display of the present invention, and FIG. 16 is a timing diagram of the driving circuit 112 of FIG. 15 . The driving circuit 112 includes an inductor 113, eight transistors 114, 115, 116, 117, 118, 119, 120, 121, six diodes 122, 123, 124, 125, 132, 133, and three capacitors 126, 127, 128 and three voltage sources 129,130,131. The diodes 122 , 123 , 124 , 125 , 132 , and 133 are body diodes of the transistors 114 , 115 , 116 , 117 , 118 , 119 , 120 , and 121 , respectively. The voltage source 129 provides a positive second voltage (V2, V2<0), and the voltage source 131 provides any first voltage between the second voltage and the third voltage (V1, V3<V1<V2). In this embodiment, the transistor 118 is used as the first switch, the transistor 119 is used as the second switch, the transistor 114 is used as the third switch, the transistor 117 is used as the fourth switch, the transistor 120 and the transistor 121 are used as the fifth switch, and the transistor 115 is used as the fourth switch And the transistor 116 is used as the seventh switch. As disclosed in the drive circuit 40 of the known plasma display, during the operation of the resonant circuit, the potential difference between the two ends of the capacitor 126 is equal to half of the second voltage provided by the voltage source 129, and the potential difference between the two ends of the capacitor 127 is equal to that provided by the voltage source 130. Provide half of the third voltage to avoid energy loss, and in this embodiment, a bidirectional switch can be formed through the combination of the fifth switch (transistors 120, 121) and diodes 132, 133, thus making the initial state of terminal A of capacitor 128 The voltage is equal to the ground voltage, and through the resonant circuit formed by the inductor 113 and the capacitors 126 and 127 , the voltage at the terminal A of the capacitor 128 oscillates. During the oscillation process, the bidirectional switch formed by the fifth switch (transistors 120 and 121 ) and the diodes 132 and 133 can maintain the voltage at the terminal A of the capacitor 128 at the ground voltage. After the sixth switch (transistor 115 ) is turned on, the capacitor 128 and the inductor 113 form a resonant circuit, so that the voltage at the terminal A of the capacitor 128 oscillates upward from zero potential. If the seventh switch (transistor 116 ) is turned on, since the capacitor 128 and the inductor 113 form a resonant circuit, the voltage at the terminal A of the capacitor 128 can oscillate downward from zero potential. The first voltage D1 is V2-V1, and the second voltage difference D2 is V3-V1. The oscillating change of the voltage through the terminal A can cause the voltage difference between the sustain electrode 18 and the sustain electrode 19 to change, so that the voltage difference across the capacitor 128 oscillates between the first voltage difference D1 and the second voltage difference D2 .

Compared with the known technology, the method for driving a plasma display according to the present invention inputs a fixed voltage to a sustain electrode in each sub-pixel unit during the sustain phase, and inputs a voltage whose positive and negative polarity oscillates with time. The other sustaining electrode makes positive voltage and negative electrode periodically change between the two sustaining electrodes in a single sub-pixel unit. When the potential difference between the two sustain electrodes is greater than a discharge voltage, the ionized gas discharge is caused to generate ultraviolet rays, so the driving method of the present invention only needs to use a resonant circuit to generate a drive pulse to one sustain electrode, without disposing the other sustain electrode corresponding resonant circuit. As shown in the driving circuit of the first plasma display of the present invention, the present invention can save the inductance and capacitance components required by the resonant circuit. Therefore, the method for driving a plasma display of the present invention discloses a driving waveform different from that of the known technology, which not only achieves the purpose of driving the sustain electrode to discharge the ionized gas, but also uses fewer circuit components to complete the driving circuit of the present invention, and can also Lower overall production costs. Furthermore, the driving method of the present invention can be used not only in the maintenance phase. When this method is used, the number of components can be reduced and the circuit efficiency can be increased, so it can be applied to the reset or address stage, so that it can effectively achieve the effect of reset or address.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and improvements made according to the claims of the present invention shall fall within the scope of the patent of the present invention.

Claims (12)

1. A driving method of a plasma display, the plasma display comprising a first electrode and a second electrode, the driving method comprising the following steps: inputting a first voltage V1 to the first electrode; In a first period, a second voltage V2 is input to the second electrode, the second voltage is greater than the first voltage, so that the voltage difference between the first electrode and the second electrode is a first voltage difference D1, and The first voltage difference D1 is V2-V1; and In a second period, a third voltage V3 is input to the second electrode, the third voltage is lower than the first voltage, so that the voltage difference between the first electrode and the second electrode is a second voltage difference D2, and The second voltage difference D2 is V3-V1. 2. The driving method according to claim 1, wherein the second voltage is a positive voltage, and the third voltage is a negative voltage. 3. The driving method as claimed in claim 1, wherein the plasma display comprises a first voltage source for providing the first voltage to the first electrode; a second voltage source for providing the second electrode the a second voltage; a first switch electrically connected between the second voltage source and the second electrode; a third voltage source for providing the third voltage to the second sustain electrode; and a second switch, electrically connected between the third voltage source and the second electrode; the driving method also includes: The first switch is turned on during the first period to input the second voltage on the second electrode, so that the voltage difference between the first electrode and the second electrode is maintained at the second voltage during the first period. a voltage difference D1; and The second switch is turned on in the second period to input the third voltage on the second electrode, so that the voltage difference between the first electrode and the second electrode is maintained at the second voltage in the second period. Voltage difference D2. 4. The driving method as claimed in claim 3, wherein the plasma display further comprises a plasma display panel and an inductance element, the plasma display panel is an equivalent capacitance, and in the driving method, the inductance element is used for Resonance is generated with the equivalent capacitance, so that the potential difference between the first and second electrodes can oscillate back and forth between the first voltage difference D1 and the second voltage difference D2. 5. The driving method as claimed in claim 4, wherein the plasma display further comprises a third switch electrically connected to the inductive element, and the driving method further comprises the following steps: In a third period, the third switch is turned on, so that the potential of the second electrode of the equivalent capacitor and the inductance element oscillates downward from the first voltage difference D1, and the third period is in the between the first and second periods. 6. The driving method as claimed in claim 4, wherein the plasma display further comprises a fourth switch electrically connected to the inductive element, and the driving method further comprises the following steps: The fourth switch is turned on during a fourth period, so that the potential difference between the first and second electrodes of the equivalent capacitance and the inductance element oscillates upwards from the second voltage difference D2, and the fourth period is at after the second period. 7. The driving method according to claim 6, wherein the plasma display further comprises a fifth switch electrically connected between the second electrode and a ground terminal, and the driving method further comprises: When the potential at the second electrode oscillates to zero potential, the fifth switch is turned on to maintain the second electrode at zero potential. 8. The driving method as claimed in claim 7, wherein the plasma display further comprises a sixth switch electrically connected to the inductance element, and the driving method further comprises: After the second electrode is maintained at zero potential, the sixth switch is turned on, so that the equivalent capacitance and the inductance element resonate, and the potential of the second electrode oscillates upward from zero potential. 9. The driving method as claimed in claim 7, wherein the plasma display further comprises a seventh switch electrically connected to the inductance element, and the driving method further comprises: After the second electrode is maintained at the electrical zero position, the seventh switch is turned on, so that the equivalent capacitance and the inductance element resonate, and the potential of the second electrode oscillates downward from zero potential. 10. The driving method according to claim 1, wherein: A third period is also included between the first and second periods, and in the third period, the voltage difference between the first electrode and the second electrode gradually oscillates downward from the first voltage difference D1 to the second voltage difference D2; and A fourth period is also included after the second period, and in the fourth period, the voltage difference between the first electrode and the second electrode gradually oscillates from the second voltage difference D2 to the first voltage difference D1. 11. The driving method according to claim 10, wherein the second voltage is a positive voltage, and the third voltage is a negative voltage. 12. The driving method according to claim 10, wherein the plasma display further comprises a plasma display panel and an inductance element, the plasma display panel is an equivalent capacitance, and in the driving method, the inductance element It is used to resonate with the equivalent capacitance, so that the potential difference between the first and second electrodes can oscillate back and forth between the first voltage difference D1 and the second voltage difference D2.

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