WO2002031854A1 - Ecran d'affichage a plasma, et procede et dispositif permettant d'effectuer un essai de duree de vie sur ledit ecran d'affichage a plasma - Google Patents
Ecran d'affichage a plasma, et procede et dispositif permettant d'effectuer un essai de duree de vie sur ledit ecran d'affichage a plasma Download PDFInfo
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- WO2002031854A1 WO2002031854A1 PCT/JP2001/008897 JP0108897W WO0231854A1 WO 2002031854 A1 WO2002031854 A1 WO 2002031854A1 JP 0108897 W JP0108897 W JP 0108897W WO 0231854 A1 WO0231854 A1 WO 0231854A1
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
- G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
- G09G3/294—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for lighting or sustain discharge
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
- G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
- G09G3/293—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for address discharge
- G09G3/2932—Addressed by writing selected cells that are in an OFF state
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
- H01J11/10—AC-PDPs with at least one main electrode being out of contact with the plasma
- H01J11/12—AC-PDPs with at least one main electrode being out of contact with the plasma with main electrodes provided on both sides of the discharge space
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/42—Measurement or testing during manufacture
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/043—Preventing or counteracting the effects of ageing
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/04—Display protection
- G09G2330/045—Protection against panel overheating
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2211/00—Plasma display panels with alternate current induction of the discharge, e.g. AC-PDPs
- H01J2211/20—Constructional details
- H01J2211/62—Circuit arrangements
Definitions
- the present invention relates to a plasma display panel used for image display of, for example, a computer and a television, and more particularly to a plasma display panel that deteriorates a plasma display panel and The present invention relates to a life test method for examining the life, a life test device, and a plasma display panel suitable for performance evaluation such as a life test.
- Background art
- Fig. 16 shows a plan view of the general PDP 100 with the front glass substrate 101 removed
- Fig. 17 shows the image display area 12 of the PDP 100 shown in Fig. 16.
- 3 shows a partial cross-sectional perspective view of FIG.
- the PDP 100 has a configuration in which light-emitting cells of each color are arranged in a matrix. As shown in FIG. 17, a front glass substrate 101 and a rear glass substrate 102 are separated from each other by partition walls 109. They are provided facing each other while maintaining a gap through the gap.
- Discharge electrode pairs (display electrode group 103 and display scan electrode group 104) are arranged in parallel on front glass substrate 101, and on rear glass substrate 102 perpendicular to the discharge electrode pair.
- a padless electrode group 107 is provided.
- the periphery of each of the substrates 101 and 102 is sealed by an airtight seal layer 121 (FIG. 16) made of frit glass, which is indicated by oblique portions.
- a discharge space 122 is formed, an inert gas is filled, and red, green, and blue phosphor layers (11 OR, G, B) are provided.
- Display electrode group 1 above Ultraviolet rays generated by the sustain discharge between O3 and the display scanning electrode group 104 excite the phosphor layers 11OR, G, and B to emit light, and the image display area 123 (Fig. The image is displayed in).
- PDPs like other display devices, are required to maintain good display quality over a long period of time.
- their lifespan is comparable to that of the currently popular CRT. More than tens of thousands of hours are required. However, there is still plenty of room for improvement in life at the moment in the PDP.
- PDPs are expensive in terms of product cost per sheet, and it is difficult to remove a large number of PDP samples for life testing.
- PDP samples continuously used in the life test have severely deteriorated characteristics such as brightness, and have no value as a product, so they have to be discarded. It is.
- reducing the number of PDP samples withdrawn for life testing to reduce loss cost will increase the probability that short-lived PDPs will be marketed. Get higher.
- the front glass substrate 101 thermally expands in the direction indicated by the arrow, and the difference in thermal expansion coefficient between the front glass substrate 101 and the hermetic sealing layer 122 As a result, stress concentrates on the hermetic seal layer 1 2 1 and breaks, that is, a so-called panel crack may occur. Therefore, in order to prevent the panel from being cracked due to this heat generation, in the conventional life test, the lighting pattern in the image display area 123 is changed.
- FIG. 18 is a diagram showing an example of a lighting pattern in an image display area 123 during a conventional life test.
- the image display area 123 includes a constantly lit part 70 1 disposed at the center thereof and a constantly lit part 70 1 over the entire periphery of the image display area.
- a lighting pattern composed of the regular bubble lamp portion 72 arranged is displayed.
- the constantly lit part is required during one field.
- the part that appears to be constantly displayed in white when sustain discharge is performed, and the part that is always turned off refers to the part where no sustain discharge is performed and no light is emitted during the driving time of the life test.
- the life evaluation is performed by, for example, determining the luminance side in the constantly lit portion 701, and confirming the malfunction of the discharge cell.
- the always-off portion 702 does not generate heat during the life test period, and is disposed on the entire periphery of the image display area 123, so that the heat generation at the periphery of each glass substrate 101, 102 Is suppressed. As a result, the amount of distortion due to thermal expansion generated in the vicinity of the hermetic seal layer 121 is reduced and stress concentration is reduced, so that the occurrence of panel cracks can be suppressed. As shown in FIGS.
- the impurities contained in the phosphor layer and the like are gasified and diffused into the discharge space due to the heat generated by the sustain discharge, but are maintained in the always-lit portion 702. Since no discharge or the like is performed at all, impurity gas is sequentially captured and accumulated in the phosphor layer and the like in this portion, and when the PDP is normally used as a display device for a television or the like, there are few constantly extinguished portions. This is because such a behavior that impurity gas is trapped hardly occurs.
- a second object is to provide a life test method and a life test apparatus capable of promoting deterioration.
- a plasma display panel includes a first cell region for displaying an image, in which a plurality of discharge cells are formed in a matrix, and A plurality of discharge cells formed in a matrix, which are different from the first cell region, and a second cell region for performance evaluation is provided. This allows the first cell area to be used as a product for image display even after performance evaluation such as life characteristics and aging characteristics in the second cell area, eliminating the need to discard the panel after the performance evaluation. In addition, the loss cost can be reduced.
- first and second cell regions have an electrode group for applying a voltage to emit light in all cells in each of the cell regions, and the first cell region and the second cell region , And are arranged independently in a hermetically sealed discharge space inside the panel. This prevents impurities and the like generated when performance is evaluated in the second cell region from entering the first cell region for image display.
- the electrode group of the first cell region is formed so as to be independently driven from the electrode group of the second cell region. As a result, while the performance evaluation is being performed in the second cell region, no image display is performed in the first cell region, so that the first cell region can be used as a product.
- each of the first and second cell regions is arranged.
- the discharge space is filled with a discharge gas made of an inert gas
- the discharge space in which the second cell region is arranged is filled with a discharge gas that promotes the deterioration of the cell. Is also good. As a result, the evaluation period of the life characteristics can be shortened.
- the mass and pressure of the discharge gas sealed in the second cell region may be smaller than those in the first cell region.
- the life test method for a plasma display panel includes a first cell region for displaying an image, in which a plurality of discharge cells are formed in a matrix, and the first cell region. Is a different region, a first step of assembling a plasma display panel including a plurality of discharge cells formed in a matrix, and a second cell region for evaluating life characteristics; and A second step of driving the cell region using a predetermined driving method to evaluate the life characteristics.
- the driving method can shorten the life in a short time by using a driving method that further promotes the deterioration of the second cell region as compared with a driving method that displays an image in the first cell region. Can be evaluated.
- a life test method for a plasma display panel drives a plasma display panel to be tested by a time-division gray scale display method in a frame to accelerate deterioration
- the time-division display pattern of the in-frame time-division gray scale display method applied during the test includes an address period in which at least one address discharge is performed in one frame period, and the number of discharges in the remaining discharge maintenance period is
- the plasma display panel is characterized in that it is set to include more than the time-division gray scale display method in a frame applied when the plasma display panel is normally used.
- the number of discharges in one frame is increased compared to image display drive, and PDP deterioration due to discharge is promoted, and the PDP life is shortened in a short time. Be able to evaluate.
- the period of the sustaining pulse applied during the sustaining period during the test may be set to be shorter than that of the in-frame time-division display method applied when the plasma display panel is normally used.
- the total length of the address period occupying the one frame period at the time of the test may be set to be shorter than that of the intra-frame time division display method applied when the plasma display panel is normally used. .
- the former and latter settings may be combined. As a result, the number of discharges increases, and PDP deterioration due to the discharge is promoted.
- the total number of address periods within the one frame period at the time of the test is determined by the in-frame time division display method applied when the plasma display panel is normally used.
- the address discharge performed on the electrode group including a plurality of electrodes included in the plasma display panel during the address period during the test was set to a value smaller than that, and the address discharge was performed by two of the electrode groups. It may be performed simultaneously for more than two electrodes. By doing so, the address period in one frame can be shortened, so that the discharge sustaining period of one frame can be lengthened and the number of discharges can be increased.
- the life test method of a plasma display panel according to the present invention is characterized in that a test target plasma display panel is driven by a time-division gray scale display method in a frame to accelerate deterioration, and a time-division gray scale in a frame applied at the time of testing
- the time-division display pattern of the display method includes an address period in which at least one address discharge is performed in one frame period, and a discharge sustaining pulse voltage applied in the remaining discharge sustaining period is a voltage of the plasma display panel.
- the setting may be higher than that of the in-frame time division gray scale display method applied during normal use.
- a plasma display according to the present invention is provided.
- a plasma display panel to be tested is driven by using a time-division gray scale display method in a frame, and a partial area other than a peripheral part in an image display area of the plasma display panel is constantly lit. It is characterized in that a constantly-lit image is displayed, and a blinking image that is repeatedly turned on and off is displayed in an area other than the partial area in the image display area.
- a blinking image is displayed on the entire peripheral portion of the image display area, so that heat generation at the peripheral portion is suppressed and stress concentration on the hermetic seal layer due to thermal expansion of the glass substrate is alleviated. The occurrence of cracks is prevented. Further, in the image display area, since the blinking image is displayed in the remaining image display area other than the part where the always-on image is displayed, there is no always-off image in the entire image display area. On the other hand, in a portion where a blinking image is displayed, impurity gas is not trapped and accumulated in a specific region as in a portion where a constantly-lit image is displayed. Therefore, the life of the PDP can be evaluated under the same conditions as those under which the behavior of the impurity gas in the PDP is similar to actual use.
- the blinking image may be an image produced by periodically scrolling a band-shaped lighting image having a predetermined width in a predetermined direction.
- the blinking image be an image in which at least 10% of one blinking period is kept in the lighting state. This is because most of the impurities trapped in the phosphor layer are immediately gasified, and a more appropriate lifetime evaluation of the PDP can be performed.
- the plasma display panel to be tested is driven by using a time-division gradation display method within a frame, and a high gradation that emits a high gradation in a partial area other than a peripheral part in an image display area of the plasma display panel.
- An image is displayed, and a low gradation image emitting at a low gradation is displayed in an area other than the partial area in the image display area. According to this, it is also possible to evaluate the life of the portion displaying the high gradation image, Get higher.
- the front glass substrate 101 thermally expands in the direction indicated by the arrow, and the difference in thermal expansion coefficient between the front glass substrate 101 and the hermetic sealing layer 122 As a result, stress concentrates on the hermetic seal layer 1 2 1 and breaks, that is, a so-called panel crack may occur. Therefore, in order to prevent the panel from being cracked due to this heat generation, in the conventional life test, the lighting pattern in the image display area 123 is changed.
- FIG. 18 is a diagram showing an example of a lighting pattern in an image display area 123 during a conventional life test.
- the image display area 123 includes a constantly lit part 70 1 disposed at the center thereof and a constantly lit part 70 1 over the entire periphery of the image display area.
- a lighting pattern composed of the regular bubble lamp portion 72 arranged is displayed.
- the constantly lit part is required during one field.
- FIG. 1 is a block diagram of a PDP life test apparatus.
- FIG. 2 is a plan view of the PDP according to the first embodiment of the present invention, excluding a front glass substrate.
- FIG. 3 is a cross-sectional perspective view showing the structure of the evaluation cell region according to the first embodiment of the present invention.
- FIG. 4 is a diagram showing a driving method when a normal image is displayed on a PDP.
- FIG. 5 is a diagram showing a driving method of the PDP life test apparatus according to the first embodiment of the present invention.
- FIG. 6 is a diagram illustrating a driving method of a PDP life test apparatus according to the second embodiment of the present invention.
- FIG. 7 is a diagram showing a driving method of the PDP life test apparatus according to the third embodiment of the present invention.
- FIG. 8 is a diagram illustrating a driving method of the PDP life test apparatus according to the fourth embodiment of the present invention.
- FIG. 9 is a block diagram of a PDP life test apparatus according to a fifth embodiment of the present invention.
- FIG. 10 is a diagram illustrating a PDP image display pattern according to the fifth embodiment of the present invention.
- FIG. 11 is a diagram showing a PDP image display pattern according to the fifth embodiment of the present invention.
- FIG. 12 is a view showing an image display pattern of a PDP according to the fifth embodiment of the present invention.
- FIG. 13 is a diagram showing a PDP screen display pattern according to the sixth embodiment of the present invention. â
- FIG. 14 is a diagram showing a PDP image display pattern according to the seventh embodiment of the present invention.
- FIG. 15 is a diagram schematically showing the relationship between the aging complete lighting voltage and the aging time.
- Figure 16 is a plan view of a conventional PDP without a front glass substrate.
- FIG. 17 is a partial sectional perspective view showing the structure of the image display area of the PDP. ⢠Fig. 18 is a diagram showing the PDP image display pattern in the conventional technology.
- FIG. 19 is a diagram showing a PDP image display pattern according to a conventional technique.
- FIG. 20 is a diagram showing an image display pattern of a PDP according to a conventional technique.
- FIG. 1 is a circuit block diagram showing a configuration of a PDP life test device 150 according to the first embodiment of the present invention.
- the PDP 130 in FIG. 1 schematically shows only the evaluation cell area 2 of the PDP 130 shown in FIG. 2, and the illustration of the image display cell area 1 is omitted.
- the PDP life test device 150 is an external video output device.
- Ten Frame memory 151 which stores video data DR, DG, DB, etc., corresponding to red (R), green (G), and blue (B) input from, and stored video data DR, DG,
- a controller 152 for controlling DB processing and driving of each circuit; a display driver circuit 153 for applying a predetermined voltage to the display electrode group 133 in accordance with an instruction from the controller 152; and a display scan.
- a display scan driver circuit 154 for applying a predetermined voltage to the electrode group 134, an address driver circuit 155 for applying a predetermined voltage to the address electrode group 135, and each driver circuit 153, 154, 1 55 is equipped with variable voltage power supplies 1 156, 157, 158, etc. to supply the specified voltage, and is used for the evaluation cell area 2 of the PDP 130 (Fig. 2) to be subjected to the life test. It is connected so that it can be worn.
- the frame memory 15 1 can store the video data of each subframe separately for each frame, and stores the red (R) and green (G) of each pixel input from an external device.
- the multi-level video data DR, DG, DB indicating the blue (B) luminance level (gray level) and various synchronization signals are stored once.
- the controller 152 After the video data DR, DG, and DB stored in the frame memory 151 are read out by the controller 152, the lighting of the cells in each subframe for each color is performed for gradation display. Is converted to video data (hereinafter referred to as sub-frame data D sf), which is a set of binary data indicating the necessity of the data, and is stored in the frame memory 151 again.
- the controller 152 drives the display driver circuit 153, the display scan driver circuit 154, and the address driver circuit 155 according to the subframe data D sf by using a driving method described later.
- the display driver circuit 153 and the display scan driver circuit 154 are provided with variable voltage power supplies 156 and 157 for applying a predetermined voltage to the display driver circuit 153 and the display scan electrode group 133, respectively. 1 34 (each described later), and according to the signals sent from the controller 152, the display electrode group 133 and the display scan electrode group 134 have a predetermined period, A sustaining pulse having a voltage is applied.
- the address driver circuit 155 includes a variable voltage power supply unit 158 for applying a voltage to the circuit, and is connected to an address electrode group 135 (described later) to control a signal transmitted by the controller 152. Accordingly, a predetermined voltage is applied to address electrode group 135.
- PDP life test apparatus 150 has a function as a plasma display apparatus.
- FIG. 2 is a schematic plan view of the PDP 130 as one application example of the present invention when the front glass substrate 101 is removed. Note that the display electrode groups 103 and 133, the display scan electrode groups 104 and 134, and the address electrode groups 107 and 135 are partially omitted for simplicity. Components having the same reference numerals as those described with reference to FIGS. 16 and 17 are the same components and will not be described in detail.
- the PDP 130 has a cell area 1 for image display and a cell area 2 for evaluation.
- the PDP 100 described in the prior art with reference to FIGS.
- the structure is substantially the same as that described above, except that an evaluation cell area 2 for use in a life test is provided adjacent to the end of the image display cell area 1.
- This evaluation cell area 2 has a structure similar to that of the image display cell area 1 except that the area thereof is smaller than that of the image display cell area 1.
- the front glass substrate 101 see FIG.
- the back glass substrate 102 a display electrode group 133, a display scan electrode group 134, an address electrode group 135, and the like, which are sealed by a hermetic seal layer 141.
- a table capable of displaying light emission in the evaluation cell area 2 is shown.
- the area of the indicated area 14 2 may have a size (about 10 cells) necessary for the life evaluation.
- the area of the light receiving area such as a luminance measuring device used for measuring the life of the PDP may be changed according to the size of the light receiving area, and if the size is set to the minimum necessary, the material used can be reduced. It is preferable in terms of cost because it can be made.
- the evaluation cell area 2 may have the same size as the image display cell area 1.
- FIG. 3 is a cross-sectional perspective view for explaining the configuration of the evaluation cell region 2.
- N display electrode groups 13 3 and display scan electrode groups 1 3 4 (only two electrodes are shown in FIG. 3) are provided on the opposite surface of the front glass substrate 10 1.
- a suffix is added to indicate the Nth one as shown in Fig. 1.) are arranged in parallel in a striped pattern.
- Each of the electrode groups 13 3 and 13 4 is composed of a transparent electrode and a pass electrode (both not shown) for preventing a voltage drop due to the electric resistance of the transparent electrode. It is covered with a layer 105 and then with a MgO overcoat 106.
- the opposing surface of the rear glass substrate 102 there are M striped padded electrode groups 135 (see FIG. 1. In FIG. 3, only four are shown. Are arranged in a direction orthogonal to the electrode groups 13 3 and 13 4, and a dielectric layer 108 made of lead glass or the like is coated to cover the surface. You.
- a rib 139 is formed adjacent to the address electrode group 135.
- the ribs 139 block discharge diffusion to adjacent cells at the time of address discharge and prevent so-called light crosstalk.
- phosphors 140 R, 140 G, and 140 B which emit red (R), green (G), and blue (B), respectively, are arranged between adjacent ribs 13. They are painted so as to cover the dress electrode groups 135.
- stripe-shaped ribs are employed, but other shapes such as lattice-shaped ribs may be used.
- the space between each of the glass substrates 101 and 102 is sealed by the hermetic seal layer 141 to form the evaluation cell region 2, thereby discharging the evaluation cell region 2.
- the space 143 is configured so as to be independent of the discharge space 122 of the image display cell region 1, and is provided with an electrode group that can drive each cell region independently. As a result, it is possible to selectively perform the life evaluation test on the evaluation cell region 2, and at that time, impurities contained in the cathode material, the ribs, and the phosphor become impurity gases due to ion collision or the like at the time of discharge. Even if the impurity gas is discharged into the discharge space 143, there is no possibility that the impurity gas enters the discharge space .122.
- the image display cell area 1 of the PDP 130 can be used as a product without any problem, and there is no need to dispose of the PDP after the life test, thus reducing the loss cost compared to the past. be able to.
- the same gas as the discharge gas filled in the discharge space 122 of the cell region 1 for image display and containing a small amount of xenon as a buffer gas mainly composed of neon is applied at the same pressure (usually 6 times). . are filled with 5 xl 0 4 â 1 0 xl 0 4 about P a). If the pressure of the discharge gas filling the cell area 2 for evaluation is set lower than the pressure of the discharge gas filling the cell area 1 for image display, ion collision with the cathode material is likely to occur. Since the deterioration of the PDP is accelerated, the service life can be evaluated in a shorter time.
- a âtime-division in-frame gray scale display methodâ is used in which one frame is divided into a plurality of sub-frames, and the intermediate gray scale is expressed by combining lighting and extinguishing in each sub-frame.
- FIG. 4 is a diagram showing an example of a method of dividing one frame 200 in the case of expressing 256 gradations in the âtime-division in-frame gradation display methodâ, in which the horizontal direction is time, and the hatched portion is The address period is shown.
- one frame 200 is divided into eight subframes 201-208.
- the number of sustaining pulses for each of the subframes 201 to 208 is set so that the relative ratio of the luminance of each of the subframes 201 to 20.8 is 1: 2: 4: 8: 16: 32: 64: 128.
- 256 gradations can be displayed by combining eight subframes.
- Each of the sub-frames 201 to 208 is composed of an address period 209 having a certain fixed time in common, and a discharge sustaining period 210 having a time length corresponding to the relative ratio of luminance.
- the display scan electrode group 104 is changed from the first to the n-th line by line in the address period 209 according to the subframe data D sf. Scanning is performed in order to generate a minute discharge between the display scan electrode group 104 and the address electrode group 107, and to accumulate wall charges in the discharge cells to be turned on.
- the display electrode group 103 and the display scan electrode group 104 receive the square-wave discharge sustain pulses 21 1 and 212 having the voltage V 0 and the period T 0, respectively, with a half cycle shift. Is applied to the entire surface of the panel at the same time, and the discharge is continued in the discharge cells in which the wall charges are formed. Ultraviolet light generated by this discharge excites each phosphor 11 OR, 110 G, 110B (FIG. 17) to emit light. By repeating such an operation between the sub-frame 201 and the sub-frame 208, the regularly arranged cells are selectively discharged and emitted according to the display data, and the image is displayed.
- the display is performed in the display area 123 (FIG. 2) of the cell area 1 for use.
- driving for image display such a driving method for displaying a normal image on the PDP is referred to as âdriving for image displayâ.
- a method of driving the evaluation cell region 2 used for the evaluation of the life test will be described.
- a normal image may be displayed in the evaluation cell area 2 using the same driving method as the image display area 1, but a method for promoting the deterioration of PDF as described below is described. If used, the lifetime of a PDP can be evaluated in a shorter time.
- FIG. 5 is a diagram showing an example of a method of dividing one frame to show a driving method of the PDP life test apparatus 150 according to the first embodiment, in which the horizontal direction is time, and the hatched portion is an add. Les period.
- One frame 230 is divided into eight subframes 231 to 238 to display 256 gradations per color, and each subframe 231 to 238 has a relative luminance ratio of 1: 2: 4. : 8: 16: 32: 64: 1 28
- the discharge sustain pulse is set.
- Each of the sub-frames 231 to 238 includes an address period 239 and a discharge sustaining period 240.
- the configuration and the period length are the same as those of the image display drive described in FIG. 4, and the detailed description is omitted.
- the difference from the image display drive is the sustaining pulses 241 and 242 applied simultaneously to the display electrode group 133 and the display scan electrode group 134 on the entire panel during the sustaining period 240.
- Each of the sustaining pulses 241 and 242 is a rectangular wave having a period T 1 and a voltage V 0 and is shifted from each other by a half period, and the period T 1 is used for driving the image display in the image display cell area 1. It is set shorter than the period TO of each sustaining pulse 21 1, 212 (FIG. 4). As a result, the number of discharges in each discharge sustaining period 240 is increased as compared with the number of discharges in the discharge sustaining period during image display driving. That is, the total number of discharges in the entire frame 230 is increased as compared with the image display drive.
- the life of a PDP is caused by a discharge in the discharge space, a decrease in the intensity of ultraviolet light, deterioration of the phosphor, deterioration of the brightness, which is considered to be due to the attachment of impurities to the phosphor surface, and ion collision with the cathode material.
- it appears as a malfunction of the discharge cell which is considered to be caused by a change in the electric field distribution due to a sputter on the cathode material.
- the deterioration of the phosphor due to the ultraviolet rays generated during the discharge and the ion collision with the cathode material during the discharge called sputtering, are major reasons for shortening the PDP life.
- the period T 1 of the sustaining pulses 21 and 24 42 is set to be short, and the number of discharges in one frame 230 is also increased. Deterioration of the phosphor with an increase in the total amount is promoted, and of course, the deterioration of the evaluation cell area 2 in the PDP 130 is promoted.
- the degree of acceleration of the PDP degradation rate due to the increase in the number of discharges increases in proportion to the total number of discharges in one frame during image display driving. For example, by setting the number of discharges 256 in one frame to 256 times, which is 10 times the number of discharges in one frame when performing full gradation display in image display drive, the deterioration of PDP is reduced by the number of discharges. It is accelerated proportionally and its life is shortened by about 10 times.
- the value of the period T1 of the sustaining pulse is preferably about 3 sec to 10 sec so as not to cause panel cracking due to heat generation of the panel due to an increase in the number of discharges.
- the address period is set in the same manner as the normal use condition, a life test similar to the normal use condition can be performed in consideration of the deterioration of the PDP due to the address discharge.
- the deterioration of the PDP can be promoted in comparison with the image display drive while considering the normal use conditions, and the life of the PDP 130 can be evaluated in a short period of time. it can.
- the time length of one frame 230 is equal to the time length of one frame 200 in the image display drive. They do not have to be the same as the drive,
- a similar effect can be obtained by setting the period T 1 so as to be greater than the number of discharges per unit time divided by the time of 200.
- a display electrode group 133 and a display scan electrode group 134 that form a pair facing each other are formed in parallel.
- the display electrode group 133 and the display scan electrode group 134 consist of a transparent electrode and a bus electrode (both not shown) for preventing a voltage drop due to the electric resistance of the transparent electrode.
- the transparent electrode is an ITO strike formed by a sputtering method, and the bus electrode is obtained by forming Ag by a printing method.
- a dielectric layer 105 is coated on the display electrode group 133 and the display scan electrode group 134 by a printing method, and a MgO protective film 106 is further coated by EB vapor deposition.
- This padless electrode group 135 is obtained by forming Ag by a printing method, and further comprises a dielectric layer 1 formed by a printing method.
- the electrode groups 13 3, 13 4, and 13 5 are configured to have the same pitch as the arrangement of the electrode groups 103, 104, and 107 in the image display cell area 1. Therefore, small numbers are arranged in proportion to the area of the cell region.
- a paste containing a glass material is repeatedly screen-printed and then fired to form ribs 139, respectively.
- the ribs 139 define the discharge space 144 in the line direction for each sub-pixel (unit light-emitting area), and define the gap size to be a constant value (about 150 im).
- the components of the image display cell region 1 are simultaneously formed in the same manner as the evaluation cell region 2. It is formed.
- a known method disclosed in Japanese Patent Application Laid-Open No. 2000-133143 can be used. it can.
- the cost of providing the evaluation cell area 2 is about the material cost and the PDP 1
- the evaluation results of the life characteristics of the evaluation cell region 2 manufactured under the same conditions can be applied directly to the evaluation of the life characteristics of the image display cell region 1.
- each of the cell regions 1 and 2 is formed. Is sealed by airtight sealing layers 121 and 141 made of frit glass.
- each of the discharge spaces 122, 144 is evacuated, and the discharge gas is filled to produce the discharge space.
- This discharge gas may be charged into the image display cell area 1 and the evaluation cell area 2 at the same time.However, after filling the evaluation cell area 2 first and conducting a life test, May be filled in the cell area 1 for use.
- the display electrode group 133 of the evaluation cell area 2 is electrically shared as shown in FIG. 1, and the one end (the right end in the figure) of the line direction Is connected to the display driver circuit 15 3. Further, the display scan electrode group 134 is independently connected to the display scan driver circuit 154 at the other end (left end in the figure) in the line direction. Address telephone
- the pole group 135 is connected to the address driver circuit 155 with its one end independent.
- This judgment is made based on the result of the inspection, which is performed on predetermined inspection items (for example, the time until the luminance decreases by 50% or the occurrence of cell malfunction). Based on this judgment, a plasma display panel with good results is regarded as a product, and a product with poor results is distinguished from a product as a defective product. It can be prevented from being distributed as much as possible.
- the image display cell region 1 and the evaluation cell region 2 for evaluating the lifetime are provided on the same substrate.
- Each of the cell regions 1 and 2 is formed in an independent state by the hermetic seal layers 121 and 141, and an electrode group that can be independently driven is provided for each.
- the image display cell region 1 independently formed by the hermetic sealing layer 121 can be used as a product. Therefore, even if the number of PDP samples extracted for the life test is increased, the PDP need not be discarded, and the cost can be reduced.
- the life test period can be further shortened by using a driving method that promotes deterioration in the evaluation cell region 2 or by filling a gas that promotes deterioration.
- a PDP product with a short life is distributed to the market by a manufacturing method in which the PDP product is subjected to a life test and only those products with good results are made PDP products.
- the evaluation cell area 2 is preferably formed as shown in FIG. 2, but when the PDP 130 is formed as a completed product such as a television, the image display cell area 1 is used as a screen. As long as the position is exposed and the evaluation cell area 2 is hidden, it may be formed at any position such as the upper end, the lower end, and the outer periphery of the image display cell area 1.
- the PDP 130 is provided with a plurality of evaluation cell areas 2 at a position where it does not interfere when the PDP 130 is used in a television or the like, and the life test is performed with a plurality of cells, the life test can be further improved. Improves reliability.
- one evaluation cell region may be provided on the substrate, and a plurality of image display cell regions may be provided.
- the PDP thus manufactured may be cut using a laser or the like for each image display cell region.
- one of the plurality of image display cell areas may be used as the life evaluation cell area.
- the discharge cell sequence at the right end may be partitioned by an airtight seal and used as the image evaluation cell region 2. Since the discharge space 144 of the evaluation cell area 2 and the discharge space 122 of the image display cell area 1 are formed independently, the evaluation cell area 2 should be deleted after the life test. You can. Furthermore, a plurality of image display cell regions may be provided on the same substrate using a large front glass substrate 101 and a rear glass substrate 102 that can form a plurality of image display cell regions 1. . In this way, the life in a plurality of image display cell areas can be determined by performing a life test on one evaluation cell area 2, which is preferable from the viewpoint of cost.
- Each of the electrode groups 133 to 135 is provided independently of each of the electrode groups 103, 104, and 107 of the image display cell region 1. It may be provided through. In that case, when performing the life test, the evaluation cell
- the PDP life test apparatus 150 according to the second embodiment differs from the first embodiment in the configuration shown in FIG. 1 and the driving method of the evaluation cell area 2 shown in FIG. Have the same configuration, and the description of the same configuration will be omitted.
- the configuration of the PDP life test apparatus 150 in the second embodiment is substantially the same as the configuration described in the first embodiment with reference to FIG. Since the data storage method is different, that point will be described.
- the frame memory 15 1 After the video data DR, DG, and DB stored in the frame memory 15 1 are read out by the controller 15 2, they are converted into sub-frame data D sf indicating the necessity of cell lighting for each color. And stored in the playback frame memory 15 1.
- the frame memory 15 1 divides and stores the video data of each sub-frame for each frame, but in the second embodiment, However, it is stored as video data of one subframe without being divided into a plurality of subframes. Therefore, in the evaluation cell area 2 of the PDP 130, a two-gradation display of whether or not to light the cell is performed.
- FIG. 6 shows a driving method of the PDP life test apparatus 150 according to the second embodiment of the present invention.
- the horizontal direction indicates time, and the shaded area indicates the address period.
- one frame 250 forms one subframe 251 without being divided into a plurality of subframes.
- the subframe 25 1 has an address period 25 2 for performing an address and a discharge sustain period 25 3 for performing a sustain discharge.
- one frame 250 and the address period 2502 have the same length as the one frame 200 and the address period 209 in the image display drive.
- the discharge sustaining period 25 3 is the length of time in the subframe 2 â² 51 excluding the address period 25 2.
- each of the sustaining pulses 2 5 4 and 2 5 5 applied to each display electrode group 13 3 and the display scan electrode group 13 4 has the same cycle T 0, voltage V as in the image display drive. It is a 0 square wave.
- the length of the discharge sustaining period 253 in one frame 250 can be made longer than that of the image display drive.
- the number of addresses in one frame 200 is 1 in each subframe 201 to 208. This is a total of 8 times.
- the number of addresses in one frame 250 is only one, that is, the address period 2 52 of the subframe 25 1. .
- the length occupied by the address period 255 in one frame 250 can be reduced as compared with the image display drive.
- the period allocated to the discharge sustaining period 25 3 can be increased accordingly. Due to the increase of the discharge sustaining period 253, even if a discharge sustaining pulse having the same period T0 as that of the image display drive is applied, the number of discharges in one frame 250 is the same as that for displaying all gradations. It can be increased as compared with image display driving.
- the life of PDP is accelerated in proportion to the number of discharges.
- the number of addresses is reduced, the address discharge itself is performed, and the life of the PDP can be evaluated in a form close to the normal use condition. Therefore, the above-described driving method can promote the deterioration of the evaluation cell area 2 of the PDP more particularly when driving for image display while taking into account the normal use conditions, and the life can be shortened in a short period of time. Can be evaluated.
- one frame 250 is not divided and is made into one subframe 251, so that high-definition image display cannot be performed. Into multiple subframes
- the address period 252 occupying 1 frame 250 can be reduced by that amount, and the discharge sustaining period can be increased. , PDP degradation can be promoted.
- FIG. 7 shows a driving method of the PDP life test apparatus 150 according to the third embodiment, in which the horizontal direction indicates time, and the shaded area indicates the address period.
- One frame 270 is divided into, for example, eight subframes 27.1 to 278.
- the one-frame 270 and the sub-frames 271 to 278 correspond to the one-frame driving 200 and the sub-frames 201 to 201 shown in FIG.
- Each of the subframes 271 to 278 has an address period 279 for writing data and a discharge sustain period 280 for performing sustain discharge.
- the address 281 is simultaneously and only once applied to all the electrodes of the display scan electrode group 134 (1 to N) and the address electrode group 135 (1 to M). A voltage is applied. By simultaneously performing this address 281 at one time, the display scan electrode group 1
- a minute discharge is generated between 34 and the padless electrode group 135, and wall charges are formed on the entire panel of the evaluation cell region 2.
- the display electrode group 133 and the display scan electrode group 134 have the same voltage V0 and period T as those of the image display drive.
- the discharge sustaining pulses 282 and 283 having 0 are applied simultaneously with a half-period shift, respectively, and the discharge is continued in the discharge cells in which wall charges are formed during the address period 279, whereby the panel is discharged.
- a white image is displayed on the entire surface.
- the image pattern to be lit on the panel is a fixed rectangle at one place because address 2 8 1 is performed only once at the same time.
- the scan for applying the display scan electrode group 13 4 hairdress voltage can be performed at one time by simultaneously performing the address 2 â² 81, and accordingly,
- the length of the address period 279 can be reduced as compared with the image display drive.
- the discharge maintenance period 280 is a value obtained by subtracting each of the shorter address periods 279 from the respective subframes 271 to 278. The time is longer than the dress period 210.
- addressing is performed once.
- addressing may be performed on two or more display scanning electrode groups 13 4 at the same time.
- the number of scans (the number of times less than the number N of the display scan electrode groups 134) can be set to be smaller than the number of scans. Therefore, the address period 279 can be shortened as compared with the image display drive, and the discharge sustaining period 280 becomes longer by that amount, which can promote the deterioration of PDP in the same manner as described above.
- the PDP life test apparatus 150 according to the fourth embodiment is different from the first embodiment in the method of driving the evaluation cell area 2 (FIG. 5), except that FIGS. Since the configuration is the same as that described with reference to FIG. 3 and FIG. 4, the description of the configuration is omitted.
- FIG. 8 shows a driving method of the PDP life test apparatus 150 according to the fourth embodiment of the present invention, in which the horizontal direction indicates time, and the shaded portion indicates the address period.
- One frame 290 during which one screen is displayed is divided into, for example, eight subframes 291 to 298.
- the one frame 290 and the sub-frames 291 to 298 have the same length of time as the image display driving frame 200 and the sub-frames 201 to 208 shown in FIG.
- Each of the sub-frames 291 to 298 has an address period 299 for writing data and a discharge sustain period 300 for performing sustain discharge.
- the display scan electrode group 134 is scanned line by line in accordance with the sub-frame data D sf, thereby forming the display scan electrode group 134 and the display scan electrode group 134.
- a small discharge is generated between the address electrode groups 135 to accumulate wall charges in cells to be turned on in the panel.
- each of the sustain pulses 301 and 302 of the square wave having the voltage V1 and the period T0 is applied to the display electrode group 133 and the display scan electrode group 134 on the entire panel while being shifted by a half cycle.
- the cell in which the wall charge is formed maintains the discharge.
- a discharge occurs repeatedly between the display electrode group 133 and the display scan electrode group 134 while reversing the polarity of the voltage.
- the voltage V 1 of each of the sustaining pulses 301 and 302 is set higher than the applied sustaining pulse voltage V 0 (usually about 150 to 185 V) during image display driving. ing.
- the discharge generated during the discharge sustaining period 300 is stronger than that during image display driving, and promotes phenomena such as ion collision with the cathode material. For example, the number of discharges per unit time is reduced. Even if it is the same as the image display drive (the period of the sustaining pulse is equal to T0), it promotes the deterioration of the phosphor. Therefore, the life of PDP can be evaluated in a short period of time. Further, since the same address as that of the image display drive is performed, the life can be evaluated in consideration of the deterioration of the address electrode.
- the voltage V1 of each of the sustaining pulses 301 and 302 is higher in consideration of the PDP deterioration rate, but if it is too large, heat generation in the panel is accelerated and panel cracking occurs. Therefore, the voltage is preferably about 150 V to 250 V because the possibility of the occurrence of the pressure increases.
- the PDP life test apparatus 350 may include the PDP life test apparatus 150 (FIG. 1) and the signal generator 351 described in the first to fourth embodiments.
- the PDP connected to this is the same as the PDP 100 (Figs. 16, 32) described in the background art as an example.
- FIG. 9 is a circuit block diagram showing a configuration of a PDP life test apparatus 350 according to the fifth embodiment.
- the PDP life test device 350 is used to connect and drive the PDP 100 to perform a life test on the PDP 100, and as shown in FIG. (Red), DG (green), DB (blue), etc., a signal generator 351, and a frame memory 352 for storing the video data DR, DG, DB, etc. output from the signal generator 351,
- the controller 353 controls the processing such as input / output of the video data DR, DG, and DB to the frame memory 352 and the driving of each circuit, and discharges the display electrode group 103 according to the instruction from the controller 353.
- the PDP life test apparatus 350 has almost the same configuration except that it includes the PDP life test apparatus 150 and the signal generator 351 described with reference to FIG. 1, and a description of those configurations will be omitted. I do.
- the signal generator 351 is a known programmable video signal generator capable of generating an image signal corresponding to a desired lighting pattern, and includes a red (R), green (G), and blue (B) signal for each pixel. It outputs multi-level video data DR, DG, DB indicating the luminance level (gray level) and various synchronization signals to the frame memory 352 and the controller 353.
- the frame memory 352 is capable of storing the video data of each sub-frame divided for each frame, and temporarily stores the video data DR, DG, DB and the like input from the signal generator 351. After the video data DR, DG, and DB stored in the frame memory 352 are read out by the controller 3 53., for gradation display, it is determined whether or not the lighting of the cells in each subframe is necessary for each color.
- the image data is converted into video data (hereinafter, referred to as sub-frame data D sf) which is a set of binary data shown below, and is stored in the frame memory 352 again.
- the controller 353 drives the display driver circuit 354, the display scan driver circuit 355, and the address driver circuit 356 according to the subframe data D sf by using a driving method described later.
- an image is displayed in the image display area 123 of the PDP 100 using the method described below to evaluate the life.
- the driving method of the PDP 100 the in-frame time division gray scale display method described with reference to FIG. 4 in the first embodiment is used.
- FIG. 10 shows a lighting pattern in the image display area 123 of the PDP 100.
- the image displayed in the image display area 123 includes a constantly lit portion 301 and a blinking portion 302.
- the constantly lit portion 301 is a portion where the life is measured by performing white display during the life test period, and is arranged in a predetermined area excluding the periphery of the image display area 123.
- the set of cells having phosphor layers of R, G, and B colors is constantly lit to display all white (all gradation display), thereby maintaining the number of sustain discharges. It is preferable to increase the number of pixels in order to shorten the life of the PDP. However, the gradation may be slightly lowered, and there is no problem in displaying an arbitrary image.
- the blinking portion 302 is a shading portion which is provided in all regions of the image display region 123 except the always-on portion 301, and blinks by repeating lighting and extinguishing. This blinking is performed in such a manner that one cycle is a two-second cycle, the light is continuously turned on at a predetermined rate during the time, and the remaining time is turned off.
- the life measurement is performed by partially deteriorating the constantly lit part 301 and deteriorating its brightness and fluctuations in discharge characteristics (discharge characteristics). This can be done by measuring and detecting (cell malfunction).
- a blinking portion 302 is displayed on the periphery of the image display area 123, and cooling is performed in the blinking portion 302 during the extinguishing time. Stress concentration due to thermal expansion of the glass substrates 101 and 102 is suppressed, and the occurrence of panel cracks is suppressed.
- the image display area 6 23 was provided with the always-off part 70 2 (both refer to FIG. 18), so the always-on part 70 1 (FIG. 18)
- the impurity gas generated by the lighting of is diffused and then trapped in the phosphor layer and the like in the always-off portion 720.
- the constantly turned off part 702 is turned off throughout the life test, and no energy is added by the discharge, so the trapped impurities accumulate as they are and diffuse again from this area It is unlikely that it will.
- the concentration of the impurity gas in the discharge space gradually decreases, and luminance deterioration and malfunction of the discharge cell due to the impurity gas are less likely to occur.
- the always-off portion is not provided, and the sustain discharge is always performed in the entire image display area 123. Even if the impurity gas is trapped in the phosphor layers 110 R, 110 G, and 110 B in the blinking part 302, enough energy to be gasified by the blinking quickly becomes available. In addition, impurity gas is released. Therefore, it is presumed that the impurity gas concentration in the discharge space 122 does not decrease unlike the related art having the always-off portion. Therefore, the effect of impurity gas must be considered
- the area of the normally lit part 301 must have an area of at least about 10 cells due to the measurement equipment for measuring the service life, but the discharge space 122 (Fig. 17) In order to evaluate the life equivalent to normal use in consideration of the influence of impurity gas in the above, it is preferable to have a large area close to normal use conditions. On the other hand, if the area is too large, the problem of panel breakage due to the heat generated by the sustain discharge will occur, but this problem will be reduced by increasing the amount of heat released from the panel, such as by installing a fan to cool the panel. Therefore, the size of the constantly lit part 301 should be determined in consideration of the amount of heat generated from the panel and the amount of heat released during the life test.
- the blinking period of the blinking portion 302 is not particularly limited, and may be determined in consideration of the relationship between the time for cooling the heat generated by the sustain discharge, and at least one continuous lighting time in one cycle of blinking. occupy 0% is desired c This is the temperature of such a value is less than the number of discharges is small because the phosphor layer does not rise, impurities trapped in the phosphor layer and the like remain to be gasified It is presumed that there is a possibility that this will happen.
- the arrangement of the always-lit portions 301 is not limited to the pattern displayed in the entire central portion as shown in FIG. 10.
- it can be a pattern that is arranged and displayed in a zigzag pattern, or a pattern in which a plurality of constantly lit parts 3 2 1 and blinking parts 3 2 2 are arranged in a staggered grid as shown in Figure 1.2.
- the always lit parts 3 1 1, 3 2 1 are lit with a size that does not interfere with the life measurement, and the blinking parts 3 1 2, 3 2 over the entire periphery of the image display area 1 2 3 2 should just be arranged. This makes it possible to evaluate the appropriate life of the PDP under conditions similar to normal use while suppressing the occurrence of panel cracks.
- the lighting pattern in the image display area is composed of the constantly lit part and the blinking part, and the blinking part is substantially the entire periphery of the image display area.
- the sixth embodiment differs from the fifth embodiment only in the lighting pattern shown in FIG. 13, and the description of the other PDP life evaluation devices and the like is omitted because they are the same. I do.
- FIG. 13 shows a lighting pattern of the image display area 123 of the PDP 100 according to the sixth embodiment of the present invention.
- the image display area 123 includes a constantly lit part 401 and a blinking part 402.
- the always-lit portion 401 is arranged in a rectangular shape at the center of the image display area 123, similarly to the always-lit portion 301 described in FIG. It keeps illuminating with white display throughout. Deterioration progresses in the normally lit portion 401, and the life of the PDP 100 is evaluated by measuring the luminance degradation and fluctuations in the discharge characteristics.
- the blinking part 402 is arranged on the periphery of the image display area 123 so as to surround the always-lit part 401.
- the scroll lighting portion 400 displayed in white is displayed from the left end to the right end of the image display area 123 while maintaining the shape so as to display a band shape having a constant width L2.
- the scroll movement is repeated periodically, and the blinking part 402 is turned off except when the scroll lighting part 400 passes. (In Fig. 13, the scroll lighting part 400 is not passing.) Region 404 is off.) As a result, each portion of the blinking portion 402 blinks periodically.
- the width L2 in the moving direction of 03 has a predetermined ratio (preferably at least 10%) of the length L1 in the horizontal direction in the image display area 123. Then, the time of one cycle until the scroll lighted part 400 returned to the same place, that is, the scroll cycle was set to 2 seconds. As a result, each discharge cell in the blinking portion 402 is displayed white for a predetermined percentage of the scroll cycle for each cycle, so that the impurity gas concentration in the discharge space is reduced as in the first embodiment. Therefore, the PDP can properly evaluate the life equivalent to normal use in consideration of the impurity gas concentration, and prevent panel cracking.
- the scroll cycle is set to 2 seconds, but it may be set to a range that can prevent panel breakage in consideration of heat generation and heat radiation in the blinking part .402.
- the scroll direction is such that the scroll direction proceeds from left to right in the drawing direction.
- the present invention is not particularly limited to this, and the scroll direction is left to right, top to bottom, and diagonal direction. The same effect can be obtained even in various directions.
- FIG. 14 shows a lighting pattern of the image display area 123 of the PDP according to the seventh embodiment of the present invention.
- the image display area 1 23 is composed of a high gradation display section 4 11 1 and a low gradation display section 4 1 2. And is different from the sixth embodiment.
- the high gradation display portion 4 1 1 is arranged in a rectangular shape at the center of the image display area 1.23, similar to the constantly lit portion 3 0 1 in FIG. 10 of the sixth embodiment. This is the part that displays white during the life test, that is, displays all red, green, and blue in high gradation. In this high gradation display area 4 1 1, the brightness
- the life is evaluated by measuring the deterioration and the variation of the discharge characteristics.
- the low gradation display portion 412 is a portion for displaying at a predetermined gradation lower than the high gradation display portion 411.
- the sustain discharge always occurs during one frame and emits light.
- the sub-frame does not necessarily emit the sustain discharge and does not emit light, thereby reducing the number of sustain discharges in one frame.
- This is a part that suppresses heat generation and displays low gradations, and is arranged over the entire periphery of the image display area 123 so as to surround the high gradation display part 411.
- the display gradation in the low gradation display portion 4 12 may be set within a range in which panel cracking does not occur in consideration of heat generation and heat dissipation.
- the predetermined gradation is preferably at least 1 / 10th gradation of the highest gradation. For example, as described in FIG. 4, if the displayable gradation is 256 gradations, sustain discharge is performed in the subframes 202, 204, and 205 to display the 26th gradation. As a result, in the low gradation display portion 412, the sustain discharge is performed during a predetermined percentage of the total discharge sustain period (at least one tenth or more).
- the impurity gas concentration in the discharge space does not decrease, and the panel crack is prevented. Therefore, it is possible to properly evaluate the lifetime of PDP, which is similar to ordinary use, in consideration of the impurity gas concentration.
- the low gradation display portion 4 12 can also perform gradation display toward the periphery of the image display area so as to have low gradation.
- the period of the sustaining pulse in the time-division gray scale display method in a frame shown in FIG. 4 is set to T 0, but the period is set to T 1 which is shorter than this. This may increase the number of discharges to accelerate the life and shorten the life test period. In this case, if the amount of heat generated in the panel increases due to the increase in the number of discharges, the position and area of the normally lit part (high gradation display part) in the panel may be adjusted, and in some cases, water cooling may be performed. Or, by applying appropriate cooling by air cooling,
- the arrangement pattern of the always-lit part 401 and the high gradation display part 411 is shown in FIG. 13 and FIG. Although the center was placed at the center, the arrangement pattern was changed to, for example, the constantly lit parts 301, 311 (Figs. 11 and 17), and the remaining area was set to the blinking part and the low part. There is no problem if the pattern is displayed by replacing the gradation display part. As long as the blinking part and the low gradation display part are arranged at the periphery of the image display area, the panel breakage is suppressed as described above and the PDP is used under conditions similar to normal use taking into account the influence of impurity gas. it is possible to perform the life test (eighth embodiment
- the life of the PDP is evaluated in the evaluation cell area 2.
- the evaluation cell area 2 is not only used for the life evaluation but is optimized for the image display cell area 1. It can also be used to predict aging time.
- the eighth embodiment the same PDP 130 and life test apparatus 150 as in the first embodiment are used, and the life test apparatus 150 is aged in the evaluation cell area 2.
- the configuration is the same as that of the first embodiment except that it is used for a test purpose, and the description of the configuration is omitted.
- PDPs are aged for a certain period of time before they are shipped as products.
- This aging refers to the operation of causing the entire surface of the PDP to emit light and removing the gas molecules adsorbed in the panel, and continuing until it stabilizes.
- ppp can stabilize the discharge characteristics and achieve the phosphor Of the light emission characteristics is reduced.
- the product varies due to process errors, and the optimal aging time differs depending on the panel.
- the aging time tends to be too short or too long for each panel. Therefore, the optimal aging time for each panel is required.
- the correlation between the aging time of the evaluation cell area 2 and the image display cell area 1 is determined in advance, and the aging time of the evaluation cell area 2 is determined for each PDP.
- the optimum aging time of the image display cell area 1 is calculated.
- FIG. 15 is a graph showing the relationship between the aging complete lighting power and the aging time in the evaluation cell area 2 and the hidden image display cell area 1 of the PDP 130.
- the aging complete lighting voltage is the minimum voltage applied to the display electrode group and the display scan electrode group when all the cells are lit in each of the cell regions 1 and 2.
- the complete lighting voltage during aging of the evaluation cell area 2 decreases with the aging time, and finally saturates at approximately Va after time Ta. You can see the rate. That is, the first time Ta at which the lighting voltage starts to stabilize at Va is the optimum aging time in the evaluation cell area 2.
- the lighting voltage of the image display cell area 1 decreases with the aging time, and saturates at about Vb after time Tb.
- This time Tb is the optimum aging time of the image display cell area 1.
- the optimal aging time is T a â T b
- the lighting voltage is V a VV b
- the aging characteristics of each cell area 1 and 2 do not match even if cell areas are formed in the same panel. You can see that. This is the same due to the difference in the ultimate pressure in each discharge space due to the difference in the area of the discharge region in each of the cell regions 1 and 2, and the difference in the area of the region that the plasma does not reach (such as the outer periphery of the display region) This is because the aging characteristics of each cell are considered to be different even under the aging condition.
- T a â T b â â â 1
- the estimation of the optimal aging time was performed using the measurement result of the lighting voltage.
- the estimation is not limited to the lighting voltage.
- the measurement may be used, and the result may be used for estimating the optimal aging time.
- the first to fourth embodiments do not necessarily have to be implemented independently, but may be implemented in each of these embodiments.
- the life of the PDP can be extended. It is possible to further accelerate the occurrence of the malfunction of the discharge cell due to the luminance deterioration and the fluctuation of the discharge characteristics shown.
- the increase in the number of discharge pulses or the increase in the sustaining pulse voltage causes the problem of panel cracking due to the generation of heat in the panel and the breakdown voltage due to the increase in current value.
- the continuous lighting of the fixed image in white display is as follows.
- a set of cells having phosphors of R, G, and B colors is always turned on, which is preferable.
- the number of sub-frames in each of the above embodiments may be divided into other numbers of sub-frames in accordance with the gradation to be displayed.
- the period of the sustaining pulse in the intra-frame time-division gray scale display method shown in FIG. 4 is T o and the voltage V o.
- the life test is performed using the normal in-frame time-division gray scale display method.
- the present invention is not limited to this.
- An image display cell and an evaluation cell may be provided on a single glass substrate, and a life test may be performed using a driving method that promotes the life of one of the cells. In this way, the life of the plasma display panel, which is similar to normal use, can be achieved while preventing panel cracking.
- the arrangement pattern of the constantly lit portion 401 and the high gradation display portion 411 is shown in FIGS. 13 and 19, as shown in FIGS. It was arranged so that it was located at the center. For example, it was replaced with the constantly lit part 4 11 shown in FIGS. 10 and 11 described in the fifth embodiment, and the remaining area was turned on and off. There is no problem if the display is performed using a pattern that replaces and displays the low gradation display section 4 1 2 .
- the blinking section 4 02 and the low gradation display section 4 12 are arranged at the periphery of the image display area. As described above, panel cracking is suppressed as described above, and P
- the plasma display panel according to the present invention is particularly effective for a display panel requiring low cost.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Power Engineering (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Gas-Filled Discharge Tubes (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Description
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Claims
1 . è€æ°ã®æŸé»ã»ã«ãã ã 㪠ãã¯ã¹ç¶ã«åœ¢æãããã ç»å衚瀺ã è¡ãããã®ç¬¬ 1 ã®ã»ã«é åãšã
åœè©²ç¬¬ 1ã®ã»ã«é åãšã¯ç°ãªãé åã§ãã£ãŠã è€æ°ã®æŸé»ã»ã«ããã 㪠ãã¯ã¹ç¶ã«åœ¢æãããã æ§èœè©äŸ¡ããããã®ç¬¬ 2ã®ã»ã«é åãšãåã ãããš
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2 . åèšç¬¬ 1ããã³ç¬¬ 2ã®ã»ã«é åã¯ã åœè©²åã»ã«é åã®å
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3 . åèšç¬¬ 1ã®ã»ã«é åã®é»æ¥µçŸ€ã¯ã åèšç¬¬ 2ã®ã»ã«é åã®é»æ¥µ 矀ãšäºãã«ç¬ç«é§åã§ããããã«åœ¢æãããŠããããš
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4 . åèšç¬¬ 1ã®ã»ã«é åããã³ç¬¬ 2ã®ã»ã«é åãé
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5 . åèšç¬¬ 2ã®ã»ã«é åãé
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7 . è€æ°ã®æŸé»ã»ã«ããã ãªãã¯ã¹ç¶ã«åœ¢æãããã ç»å衚瀺ã è¡ãããã®ç¬¬ 1ã®ã»ã«é åãšã åœè©²ç¬¬ 1ã®.ã»ã«é åãšã¯ç°ãªãé åã§ã ã€ãŠã è€æ°ã®æŸé»ã»ã«ãã ã 㪠ã ã¯ã¹ç¶ã«åœ¢æãããã 寿åœç¹æ§ãè©äŸ¡ ããããã®ç¬¬ 2ã®ã»ã«é åãšãåãããã©ãºããã£ã¹ãã¬ã€ããã«ãçµ ã¿ç«ãŠã第 1ã®ã¹ããããšã
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8 . åèšé§åæ¹æ³ã¯ã åèšç¬¬ 1 ã®ã»ã«é åã«ç»åã衚瀺ããé§å æ¹æ³ãšæ¯èŒããŠã åèšç¬¬ 2ã®ã»ã«é åã®å£åãããä¿é²ããé§åæ¹æ³ã§ ããããš
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9 . è€æ°ã®æŸé»ã»ã«ãã ã 㪠ãã¯ã¹ç¶ã«åœ¢æãããã ç»å衚瀺ã è¡ãããã®ç¬¬ 1ã®ã»ã«é åãšã åœè©²ç¬¬ 1ã®ã»ã«é åãšã¯ç°ãªãé åã§ã ã€ãŠã è€æ°ã®æŸé»ã»ã«ãã ã 㪠ãã¯ã¹ç¶ã«åœ¢æãããã ãšãŒãžã³ã°æé© æéãè©äŸ¡ããããã®ç¬¬ 2ã®ã»ã«é åãšãåãããã©ãºããã£ã¹ãã¬ã€ ããã«ãçµã¿ç« Ïã第 1ã®ã¹ããããšã
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US10/398,691 US20040070575A1 (en) | 2000-10-12 | 2001-10-10 | Plasma display panel, and method and device for life test of the plasma display panel |
JP2002535150A JPWO2002031854A1 (ja) | 2000-10-12 | 2001-10-10 | ãã©ãºããã£ã¹ãã¬ã€ããã«ããã³ãã®å¯¿åœè©Šéšæ¹æ³ãªãã³ã«å¯¿åœè©Šéšè£ 眮 |
Applications Claiming Priority (6)
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JP2000312091 | 2000-10-12 | ||
JP2000-312092 | 2000-10-12 | ||
JP2000312092 | 2000-10-12 | ||
JP2000312090 | 2000-10-12 | ||
JP2000-312090 | 2000-10-12 | ||
JP2000-312091 | 2000-10-12 |
Publications (1)
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WO2002031854A1 true WO2002031854A1 (fr) | 2002-04-18 |
Family
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PCT/JP2001/008897 WO2002031854A1 (fr) | 2000-10-12 | 2001-10-10 | Ecran d'affichage a plasma, et procede et dispositif permettant d'effectuer un essai de duree de vie sur ledit ecran d'affichage a plasma |
Country Status (4)
Country | Link |
---|---|
US (1) | US20040070575A1 (ja) |
JP (1) | JPWO2002031854A1 (ja) |
TW (1) | TW535190B (ja) |
WO (1) | WO2002031854A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005020268A1 (ja) * | 2003-08-26 | 2005-03-03 | Matsushita Electric Industrial Co., Ltd. | 絶çžè枬å®è£ 眮ã絶çžè枬å®æ¹æ³ã絶çžèè©äŸ¡è£ 眮ã絶çžèè©äŸ¡æ¹æ³ãæŸé»è¡šç€ºçŽ åçšåºæ¿ããã³ãã©ãºããã£ã¹ãã¬ã€ããã« |
JP2006339025A (ja) * | 2005-06-02 | 2006-12-14 | Matsushita Electric Ind Co Ltd | ãã©ãºããã£ã¹ãã¬ã€ããã«ãä¿è·èããã³ãã©ãºããã£ã¹ãã¬ã€ããã«ã®æ€æ»æ¹æ³ |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4595385B2 (ja) * | 2004-05-25 | 2010-12-08 | ãããœããã¯æ ªåŒäŒç€Ÿ | ãã©ãºããã£ã¹ãã¬ã€ããã«ã®ãšãŒãžã³ã°æ¹æ³ |
KR100968452B1 (ko) * | 2005-12-12 | 2010-07-07 | ìŒì±ì ì죌ìíì¬ | ììì²ëŠ¬ì¥ì¹ ë° ê·ž ì ìŽë°©ë² |
CN115963008B (zh) * | 2023-02-15 | 2024-05-28 | äžåœééç§åŠç 究é¢éå¢æéå ¬åžéé建çç 究æ | äžç§å šçåœåšæçæ ç 蜚éå±ç¶å åç»ææ··åååšææ§èœè¯éªæ¹æ³ |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH04274134A (ja) * | 1991-02-28 | 1992-09-30 | Oki Electric Ind Co Ltd | ãã©ãºããã£ã¹ãã¬ã€ããã«ã®è£œé æ¹æ³ |
JPH11149870A (ja) * | 1997-11-14 | 1999-06-02 | Hitachi Ltd | ãã©ãºããã£ã¹ãã¬ã€ããã«ã®è©Šéšæ¹æ³ |
JPH11175022A (ja) * | 1997-12-16 | 1999-07-02 | Oki Electric Ind Co Ltd | ãã£ã¹ãã¬ã€ã®ãšãŒãžã³ã°æ¹æ³ããã³ãšãŒãžã³ã°è£ 眮 |
-
2001
- 2001-10-10 JP JP2002535150A patent/JPWO2002031854A1/ja active Pending
- 2001-10-10 US US10/398,691 patent/US20040070575A1/en not_active Abandoned
- 2001-10-10 WO PCT/JP2001/008897 patent/WO2002031854A1/ja active Application Filing
- 2001-10-11 TW TW090125109A patent/TW535190B/zh not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04274134A (ja) * | 1991-02-28 | 1992-09-30 | Oki Electric Ind Co Ltd | ãã©ãºããã£ã¹ãã¬ã€ããã«ã®è£œé æ¹æ³ |
JPH11149870A (ja) * | 1997-11-14 | 1999-06-02 | Hitachi Ltd | ãã©ãºããã£ã¹ãã¬ã€ããã«ã®è©Šéšæ¹æ³ |
JPH11175022A (ja) * | 1997-12-16 | 1999-07-02 | Oki Electric Ind Co Ltd | ãã£ã¹ãã¬ã€ã®ãšãŒãžã³ã°æ¹æ³ããã³ãšãŒãžã³ã°è£ 眮 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005020268A1 (ja) * | 2003-08-26 | 2005-03-03 | Matsushita Electric Industrial Co., Ltd. | 絶çžè枬å®è£ 眮ã絶çžè枬å®æ¹æ³ã絶çžèè©äŸ¡è£ 眮ã絶çžèè©äŸ¡æ¹æ³ãæŸé»è¡šç€ºçŽ åçšåºæ¿ããã³ãã©ãºããã£ã¹ãã¬ã€ããã« |
JP2006339025A (ja) * | 2005-06-02 | 2006-12-14 | Matsushita Electric Ind Co Ltd | ãã©ãºããã£ã¹ãã¬ã€ããã«ãä¿è·èããã³ãã©ãºããã£ã¹ãã¬ã€ããã«ã®æ€æ»æ¹æ³ |
JP4631550B2 (ja) * | 2005-06-02 | 2011-02-16 | ãããœããã¯æ ªåŒäŒç€Ÿ | ãã©ãºããã£ã¹ãã¬ã€ããã«ãä¿è·èããã³ãã©ãºããã£ã¹ãã¬ã€ããã«ã®æ€æ»æ¹æ³ |
Also Published As
Publication number | Publication date |
---|---|
TW535190B (en) | 2003-06-01 |
JPWO2002031854A1 (ja) | 2004-04-30 |
US20040070575A1 (en) | 2004-04-15 |
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