JP4211579B2 - Plasma display panel - Google Patents

Description

  The present invention relates to a plasma display panel used for a wall-mounted television, a large monitor and the like.

  A plasma display panel (hereinafter abbreviated as PDP or panel) is a display device with excellent visibility characterized by a large screen, a thin shape, and a light weight. A typical AC surface discharge type panel as a PDP has a large number of discharge cells formed between a front plate and a back plate arranged to face each other. The front plate is formed with a plurality of pairs of display electrodes composed of scan electrodes and sustain electrodes on the front glass substrate in parallel with each other, and a dielectric layer and a protective layer are formed so as to cover the display electrodes. The back plate has a plurality of parallel data electrodes on the back glass substrate, a dielectric layer so as to cover them, and a plurality of partition walls formed in parallel to the data electrodes on each of the dielectric layers. A phosphor layer is formed on the side surface of the partition wall. The front plate and the back plate are opposed and sealed so that the display electrode and the data electrode cross three-dimensionally, and a discharge gas is sealed in the internal discharge space. In the panel having such a configuration, ultraviolet light is generated by gas discharge in each discharge cell, and phosphors of RGB colors are excited and emitted by the ultraviolet light to perform color display.

  As a method of driving the panel, a subfield method, that is, a method of performing gradation display by combining subfields to emit light after dividing one field period into a plurality of subfields. Here, each subfield has an initialization period, an address period, and a sustain period.

  In the initializing period, initializing discharge is simultaneously performed in all the discharge cells, the history of wall charges for the individual individual discharge cells is erased, and wall charges necessary for the subsequent address operation are formed. In addition, it has a function of generating priming (priming for discharge = excited particles) for reducing the discharge delay and stably generating the address discharge. In the address period, a scan pulse is sequentially applied to the scan electrodes, an address pulse corresponding to an image signal to be displayed is applied to the data electrodes, and an address discharge is selectively generated between the scan electrodes and the data electrodes. Selective wall charge formation is performed. In the subsequent sustain period, a predetermined number of sustain pulses are applied between the scan electrodes and the sustain electrodes, and the discharge cells in which the wall charges are formed by the address discharge are selectively discharged to emit light.

  Thus, in order to display an image correctly, it is important to reliably perform selective address discharge in the address period. However, due to restrictions on the circuit configuration, a high voltage cannot be used for the address pulse, There are many factors that increase the discharge delay with respect to the address discharge, such as the fact that the phosphor layer formed on the layer makes it difficult for the discharge to occur. Therefore, priming for generating the address discharge stably is very important.

  However, the priming caused by the discharge decreases rapidly with time. For this reason, in the above-described panel driving method, the address discharge after a long time has passed from the initialization discharge, the priming caused by the initialization discharge is insufficient, the discharge delay becomes large, and the address operation becomes unstable. There has been a problem that the image display quality deteriorates. Alternatively, the writing time is set to be long in order to perform the writing operation stably, and as a result, there is a problem that the time spent in the writing period becomes too long.

In order to solve these problems, a panel and a driving method thereof have been proposed in which priming is generated using an auxiliary discharge cell formed by providing an auxiliary discharge electrode on the front plate of the panel to reduce the discharge delay (for example, Patent Document 1).
JP 2002-297091 A

  However, in the above-described panel, since the individual auxiliary discharge cells are relatively large, the distance between discharge cells for image display (hereinafter abbreviated as main discharge cells) cannot be reduced, and as a result, high definition. There was a problem that it was difficult to make it.

  The present invention has been made in view of the above-described problems, and provides a plasma display panel that can stably generate priming discharge, perform an address operation stably and at high speed, and can achieve high definition. Objective.

The plasma display panel according to the present invention includes a first substrate, a scan electrode and a sustain electrode arranged in parallel with each other on the first substrate, and a second electrode arranged opposite to the first substrate with a discharge space interposed therebetween. and the substrate, and data electrodes arranged in a direction crossing the scanning electrodes on the second substrate, a first dielectric layer covering the data electrodes, provided only on the first dielectric layer and the priming electrodes parallel with the scan electrode, a second dielectric layer covering the priming electrode, wherein the third dielectric layer covering the second dielectric layer, wherein the scan electrode and the sustain electrode On the third dielectric layer so as to partition a main discharge cell configured to face the data electrode and a priming discharge cell configured to face the scan electrode and the priming electrode. Formed gap With the door, the third dielectric layer is characterized by a reflective layer which reflects at least visible light or ultraviolet light.

  With this configuration, the second dielectric layer prevents the priming discharge cell from being destroyed due to dielectric breakdown, etc., so that the priming discharge can be stably generated to perform the addressing operation stably and at high speed, and high definition is also possible. A plasma display panel can be provided. Further, since the generated ultraviolet or visible light can be efficiently used by the third dielectric layer, an improvement in luminance can be expected.

  According to the present invention, it is possible to provide a plasma display panel that can stably generate priming discharge, perform an address operation stably and at high speed, and achieve high definition.

  Hereinafter, a PDP according to an embodiment of the present invention will be described with reference to the drawings.

(Embodiment)
FIG. 1 is an exploded perspective view showing the structure of a PDP according to an embodiment of the present invention, and FIG. 2 is a sectional view of the panel. A front substrate 21 made of glass as a first substrate and a rear substrate 31 as a second substrate are arranged opposite to each other with a discharge space interposed therebetween, and a mixed gas of neon and xenon that emits ultraviolet rays by discharge is emitted into the discharge space. It is enclosed.

  A plurality of scan electrodes 22 and sustain electrodes 23 are formed in parallel with each other on the front substrate 21. At this time, two electrodes are alternately arranged so as to be sustain electrode 23 -scan electrode 22 -scan electrode 22 -sustain electrode 23-. Scan electrode 22 and sustain electrode 23 are each composed of transparent electrodes 22a and 23a and metal bus bars 22b and 23b formed on transparent electrodes 22a and 23a, respectively. Here, a light absorption layer 28 made of a black material is provided between scan electrode 22 and scan electrode 22 and between sustain electrode 23 and sustain electrode 23. Of the scanning electrodes 22, the protruding portion 22 b ′ of the metal bus 22 b of one scanning electrode 22 is formed to protrude onto the light absorption layer 28. A dielectric layer 24 and a protective layer 25 are formed so as to cover the scan electrode 22, the sustain electrode 23, and the light absorption layer 28.

  On the rear substrate 31, a plurality of data electrodes 32 are formed in parallel to each other in a direction crossing the scan electrodes 22 and the sustain electrodes 23, and a first dielectric layer 33 a is formed so as to cover the data electrodes 32. . A plurality of priming electrodes 36 are formed in parallel with the scanning electrodes 22 on the first dielectric layer 33a. The first dielectric layer 33 a insulates between the data electrode 32 and the priming electrode 36.

  A second dielectric layer 33 b is formed so as to cover the priming electrode 36. The second dielectric layer 33b prevents the priming electrode 36 from being exposed to the discharge space due to dielectric breakdown or the like. A third dielectric layer is formed as a reflective layer 33c that reflects visible light or ultraviolet light so as to cover the second dielectric layer 33b. Further, a partition wall 34 for partitioning the main discharge cell 40 is formed on the reflective layer 33c. As shown in FIG. 1, the partition wall 34 has a vertical wall portion 34 a extending in a direction parallel to the data electrode 32 and a horizontal wall portion that forms a main discharge cell 40 and forms a gap portion 41 between the main discharge cells 40. 34b. Every other gap portion 41 has a priming electrode 36 to form a priming discharge cell 41a. Note that the gap 41b having no priming electrode is a gap that does not perform priming discharge. A phosphor layer 35 is provided on the surface of the third dielectric layer 33 c corresponding to the main discharge cell 40 partitioned by the barrier ribs 34 and on the side surfaces of the barrier ribs 34. 1 and 2, the phosphor layer 35 is not formed on the gap 41 side, but the phosphor layer may be formed.

  When the front substrate 21 and the rear substrate 31 are arranged to face each other and sealed, a protruding portion 22b ′ protruding on the light absorption layer 28 among the metal bus bars 22b of the scanning electrode 22 formed on the front substrate 21, and the rear substrate Alignment is performed so that the priming electrode 36 formed on 31 is parallel and opposed. The priming discharge is performed between the protruding portion 22b 'formed on the front substrate 21 side and the priming electrode 36 formed on the rear substrate 31 side.

FIG. 3 is an electrode array diagram of the PDP in the embodiment of the present invention. Data electrodes D _{1 to} D _m (data electrodes 32 in FIG. 1) in the column direction are arranged, and n rows of scan electrodes SC _{1 to} SC _n (scan electrodes 22 in FIG. 1) and n rows in the row direction are arranged. sustain electrodes SU ₁ to SU _n (sustain electrodes 23 in FIG. 1) and the sustain electrodes SU ₁ - scan electrode SC ₁ - scan electrode SC ₂ - sustain electrode SU ₂ - · · · and so as to alternately arranged two by two Has been. In the embodiment, n / 2 priming electrodes PR ₁ , PR are arranged so as to face the protruding portions of the odd-numbered scan electrodes SC ₁ , SC ₃ ,... (The protruding portion 22 b ′ in FIG. 1). ₃ ,... (Priming electrode 36 in FIG. 1) are arranged.

A discharge cell C _{i, j} (main discharge cell of FIG. 1) including a pair of scan electrodes SC _i , sustain electrodes SU _i (i = 1 to n) and one data electrode D _j (j = 1 to _m ). 40) are formed in the discharge space. In addition, priming discharge cells PS _i (priming discharge cells 41a in FIG. 1) including protruding portions of scan electrodes SC _i and priming electrodes PR _i are formed in odd-numbered rows among 1 to n rows.

  Next, a driving voltage waveform for driving the panel and its timing will be described.

  FIG. 4 is a drive voltage waveform diagram of the PDP in the embodiment of the present invention. In the embodiment, one field period is composed of a plurality of subfields having an initialization period, an address period, and a sustain period, and each subfield is almost the same except that the number of sustain pulses in the sustain period is different. Since this is the same, only the operation for one subfield will be described.

In half of the initializing period, data electrodes D ₁ to D _m, sustain electrodes SU ₁ to SU _n and priming electrodes PR ₁ ~PR _n-1 respectively kept 0 (V), to the scan electrodes SC ₁ to SC _n from voltage Vi ₁ of the discharge start voltage or less with respect to sustain electrodes SU ₁ to SU _n, and applies the ramp waveform voltage gradually rises toward the voltage Vi ₂ that exceeds the discharge start voltage. While the ramp waveform voltage rises, the scan electrodes SC _{1 to} SC _n and the sustain electrodes SU _{1 to} SU _n , the data electrodes D _{1 to} D _m , and the priming electrodes PR _{1 to} PR _n-1 are each first time. A weak initializing discharge occurs. Then, negative wall voltage is accumulated on scan electrodes SC _{1 to} SC _n , and on data electrodes D _{1 to} D _m , sustain electrodes SU _{1 to} S _n and priming electrodes PR _{1 to} PR _n−1 . Accumulates positive wall voltage. Here, the wall voltage at the upper part of the electrode represents a voltage generated by the wall charges accumulated on the dielectric layer covering the electrode or the phosphor layer.

In the second half of the initializing period, maintaining the sustain electrodes SU ₁ to SU _n to a positive voltage Ve, the scan electrodes SC ₁ to SC _n, the voltage Vi ₃ to be equal to or less than the discharge starting voltage with respect to sustain electrodes SU ₁ to SU _n Is applied with a ramp waveform voltage that gradually falls toward voltage Vi ₄ exceeding the discharge start voltage. During this time, the second weak initializing discharge is generated between the scan electrodes SC _{1 to} SC _n and the sustain electrodes SU _{1 to} SU _n , the data electrodes D _{1 to} D _m , and the priming electrodes PR _{1 to} PR _n−1. Occur. Then, the negative wall voltage above scan electrodes SC ₁ -SC _n and the positive wall voltage above sustain electrodes SU ₁ -SU _n are weakened, and the positive wall voltage above data electrodes D ₁ -D _m is used for the write operation. The positive wall voltage above the priming electrodes PR _{1 to} PR _n-1 is also adjusted to a value suitable for the priming operation. This completes the initialization operation.

In the address period, scan electrodes SC _{1 to} SC _n are temporarily held at voltage Vc. Then, the voltage Vq is applied to the priming electrodes PR _{1 to} PR _n−1 .

First, in the address operation of the discharge cells C _{p, 1 to} C _{p, m} (p = odd number) in the odd-numbered rows, the scan pulse voltage Va is applied to the scan electrode SC _p and the data corresponding to the image signal to be displayed. A positive address pulse Vd is applied to the electrode D _k (k is an integer of 1 to m). The scan electrodes SC _p of odd rows are scanning electrodes for writing with generating the priming discharge in accordance with the self-scanning. Accordingly, priming discharge is generated between the priming electrode PR _p and the scanning electrode SC _p by the application of the scan pulse voltage Va, and the discharge cells C _{p, 1 to} C _{p, m} and the discharge cells C _{p + 1,1 to} C Priming is supplied inside _{p + 1, m} . The discharge at this time is easy to discharge the priming discharge cell, and the voltage Vq can be set high, so that the discharge delay is small and fast and stable priming discharge.

Subsequently, an address discharge is generated in the discharge cell C _{p, k} corresponding to the data electrode D _k to which the address pulse voltage is applied. At this time, the discharge of the discharge cell C _{p, k} is generated while the priming is supplied from the priming discharge generated between the scan electrode SC _p and the priming electrode PR _p , so that the discharge delay is small and the discharge is stable. Due to this address discharge, a positive voltage is accumulated on the scan electrode SC _p of the discharge cell C _{p, k} and a negative voltage is accumulated on the sustain electrode SU _p, and the address operation in the odd-numbered rows is completed.

Next, in the address operation of the discharge cells C _{p + 1,1 to} C _{p + 1, m in} the even-numbered rows, the scan electrode voltage Va is applied to the scan electrode SC _{p + 1} in the p + 1 row, and at the same time, the data electrode D applying a positive write pulse voltage Vd to data electrode D _k corresponding to the image signal to be displayed on the p + 1 th row of the ₁ to D _m. As a result, a discharge is generated at the intersection between the data electrode D _k and the scan electrode SC _{p + 1} . At this time, in the discharge cell C _{p + 1, k} , the discharge occurs in a state where sufficient priming has already been supplied from the priming discharge generated between the scan electrode SC _p and the priming electrode PR _p , so the discharge of the address discharge The delay is very small and stable discharge. Due to this address discharge, a positive voltage is accumulated above scan electrode SC _{p + 1} of discharge cell C _{p + 1, k} and a negative voltage is accumulated above sustain electrode SU _{p + 1.} To do.

Thereafter, the same address operation is performed until the discharge cell C _{n, k} in the _n- th row _, and the address operation is completed.

In the sustain period, after returning once to the scan electrodes SC ₁ to SC _n and sustain electrodes SU ₁ to SU _n to 0 (V), applies a positive sustain pulse voltage Vs to scan electrodes SC ₁ to SC _n. At this time, the voltage between the discharge cell C _i having generated the address _discharge, the scan electrode SC _i top in _k and sustain electrode SU _i top, in addition to the positive sustain pulse voltage Vs, the scan in the address periods electrode SC _i It is subject to accumulated wall voltage and sustain electrode SU _i upper, larger than the discharge start voltage. As a result, a sustain discharge occurs in the discharge cells C _{i, k} . Hereinafter, similarly, by applying a sustain pulse alternately to the scan electrodes SC ₁ to SC _n and sustain electrodes SU ₁ to SU _n, the number of times of sustain pulse discharge cell C _i having generated the address _discharge, for _k The sustain discharge is continuously performed.

Thus, in the embodiment, in the address operation of the discharge cells C _{p, 1 to} C _{p, m in} the odd-numbered rows, the priming electrode PR _p provided on the back substrate 31 side and the scan electrode provided on the front substrate 21 side. By generating a priming discharge with respect to SC _p and supplying priming inside discharge cells C _{p, 1 to} C _{p, m} and discharge cells C _{p + 1,1 to} C _{p + 1, m} , The discharge delay is small, and high-speed and stable address discharge can be realized.

  Further, the priming electrode 36 is covered with a second dielectric layer 33b having a high withstand voltage. Therefore, there is no possibility of causing dielectric breakdown between the discharge space of the priming discharge and the priming electrode 36. Therefore, the priming discharge can be stably generated and the address operation can be performed stably and at high speed. The second dielectric layer 33b may be any layer as long as the withstand voltage is high. In the present embodiment, the second dielectric layer 33b is formed using a low melting point glass having a thickness of 10 μm, and 300 (V). The above withstand voltage is realized.

The reflective layer 33c is formed so as to cover the second dielectric layer 33b. The reflection layer 33c only needs to reflect visible light or ultraviolet light. In this embodiment, the 10 μm reflection layer 33c is formed by using a low melting point glass dispersed with 10 wt% TiO ₂ fine powder. is doing. Since the reflective layer 33c reflects ultraviolet light or visible light generated inside the main discharge cell 40 toward the front substrate 21, the generated ultraviolet light or visible light can be used efficiently and the luminance can be increased.

  The PDP according to the present invention can stably generate priming discharge, perform a writing operation stably and at a high speed, and can provide a high-definition PDP. Therefore, the PDP can be used for a wall-mounted television or a large monitor. This is useful for PDPs and the like.

The disassembled perspective view which shows the structure of PDP in embodiment of this invention Cross section of the panel Electrode arrangement of the panel Drive voltage waveform diagram of the panel

Explanation of symbols

DESCRIPTION OF SYMBOLS 21 Front substrate 22 Scan electrode 22a, 23a Transparent electrode 22b, 23b Metal bus line 22b 'Protruding part 23 Sustain electrode 24 Dielectric layer 25 Protective layer 28 Light absorption layer 31 Back substrate 32 Data electrode 33a 1st dielectric layer 33b 2nd Dielectric layer 33c Reflective layer (third dielectric layer)
34 partition wall 34a vertical wall portion 34b horizontal wall portion 35 phosphor layer 36 priming electrode 40 main discharge cell 41 gap portion 41a priming discharge cell 41b gap portion having no priming electrode

Claims (1)

A first substrate; a scan electrode and a sustain electrode arranged in parallel with each other on the first substrate; a second substrate disposed opposite to the first substrate across a discharge space; and the second substrate A data electrode disposed on the substrate in a direction intersecting the scan electrode, a first dielectric layer covering the data electrode, and disposed only on the first dielectric layer and disposed in parallel with the scan electrode The priming electrode, the second dielectric layer covering the priming electrode, the third dielectric layer covering the second dielectric layer, the scan electrode, the sustain electrode, and the data electrode are opposed to each other. A partition wall formed on the third dielectric layer so as to partition a priming discharge cell configured such that the scanning electrode and the priming electrode are opposed to each other. The third dielectric layer is few A plasma display panel, characterized in that also a reflection layer for reflecting visible light or ultraviolet light.

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