Figure 1 – Measuring layout side view 5.2.3 Field frequency The standard field frequency of the driving signal equipment shall be 60 Hz, unless the module is intended to be used at a si
Environmental conditions
Measurements shall be carried out under the standard environmental conditions, i.e at a temperature of 25 °C ± 3 °C, a relative humidity of 25 % to 85 %, and a pressure of 86 kPa to
106 kPa When different environmental conditions are used, these shall be noted on the report.
Set-up conditions
General
The standard set-up conditions outlined must be adhered to, and any deviations from these conditions should be clearly documented in the relevant specifications.
Measuring layout
Measurements shall be carried out at the standard measuring layout shown in Figure 1 When a different measuring layout is used, this shall be noted on the report
5.2.2.2 Position of light measuring device
The light measuring device shall be aligned perpendicular to the area to be measured on the screen of the PDP module
The standard measuring distance, denoted as \$\lambda_{xo}\$, is set at 2.5 times the screen height (V), which refers to the shorter side length of the screen This measuring distance must fall within the range of 1.6V to 2.8V, and it is essential to document the measuring distance in the report.
5.2.2.4 Aperture angle of light measuring device
The light measuring device shall be set at a proper aperture angle less than or equal to
2 degrees, and shall measure an area of at least 500 pixels which has an extent less than
10 % of the screen height This area corresponds to including a circular measurement area of at least 26 lines in diameter in the case of a display panel having a square pixel consisting of
To achieve a viewing area exceeding 500 pixels with an extent of less than 10% of the screen height, adjustments can be made to the measuring distance and aperture angle If setting the aperture angle proves challenging, it is important to document any deviations from standard conditions in the report.
X0 standard measuring distance = 2,5 V, where V is the screen height or short side length of screen
Figure 1 – Measuring layout (side view)
Field frequency
The driving signal equipment typically operates at a standard field frequency of 60 Hz, unless the module is designed for a notably different frequency It is essential to document the field frequency utilized in the report.
Display surface Plasma display module
Measuring point Perpendicular to screen
Adjustment of PDP modules
For contrast adjustable PDP modules, adjust the contrast to the maximum value under the standard environmental conditions
To ensure accurate measurements, automatic control functions like auto-power control (APC) and image sticking prevention must be disabled or avoided during the measurement process, as outlined in the procedures below.
When automatic control functions in the PDP module adjust the displayed luminance, and disabling these functions is impractical, it is necessary to implement a procedure that either sequentially changes input images or follows a turn-on, measure, and turn-off sequence.
In the process of sequentially altering input images, it is essential to change the input signals right before the display luminance is adjusted, with measurements taken when the displayed image is shown Any appropriate signal that disables the aforementioned automatic control functions can be used as the input signal, excluding the measured image.
To implement a turn-on, measure, and turn-off sequence for the PDP module, it should be turned off and then on again immediately before any change in displayed luminance Measurements must be taken while the image is being displayed.
The displayed luminance of both procedures mentioned above usually remains constant for several minutes which are enough for a stable measurement with a light measurement device.
Warm-up condition of PDP modules
The warm-up period must exceed 30 minutes, utilizing a signal input of 15% grey level displayed on full screen without gamma correction, unless alternative measurement methods are specified Any variations in warm-up conditions should be documented in the report.
Lighting conditions
Dark-room conditions
The illuminance on the screen of the PDP module must be below 1 lx If this illuminance notably impacts the measurement of the black level, the background subtraction method should be employed Any variations in illuminance or the use of the background subtraction method must be documented in the report.
Bright-room conditions
The lamp must be positioned to ensure that the illuminance levels on both vertical and horizontal planes meet the required standards at the center of the vertically arranged panel The acceptable illuminance precision is ± 5%, and all measured illuminance values must be documented in the report Any variations in illuminance should also be clearly indicated in the report.
5.3.2.2 Illuminance on the panel a) Vertical plane illuminance: 100 lx b) Horizontal plane illuminance: 70 lx
For optimal lighting, utilize AAA colour rendering daylight white fluorescent lamps (JIS Z 9112-1990 type N-EDL) If an alternative lamp is employed, it must be documented in the report with specific details In cases where a single lamp does not meet the required illuminance, multiple lamps may be utilized, and adjustable luminance lamps are also acceptable.
Fluorescent lamps should be operated under recommended conditions, specifically after 100 hours of aging and before reaching 2,000 hours of use Additionally, the photo spectrum of the lamps must be included in the detailed information.
5.3.2.4 Placement of illumination source and display
The panel must be installed vertically, with the lamp's long axis positioned horizontally and parallel to the panel's surface The lamp's center should align within a vertical plane that is perpendicular to the panel face and intersects its center.
Figure 2 – Example of bright-room conditions
To ensure optimal lighting conditions, the illumination must be adjusted by modifying the output of the light source, repositioning the lamps, or relocating the display panel During illuminance measurements, it is essential to move the display away from the measurement position to prevent light reflections from affecting the results.
NOTE Details in brackets are for example only.
Horizontal plane illuminance at centre of panel
Plasma display module Luminance adjustable fluorescent lamp(s) (6 × 40 W tubes)
Light measuring device Normal vertical plane
Horizontal distance between lamp and panel: 2,43 m Black baffle
The walls will feature black curtains or be painted grey with a reflectivity of no more than 20% Additionally, the floor will also be grey, maintaining the same reflectivity limit of 20%.
When measuring illuminance, it is crucial to consider the color and placement of the measurement system, including walls, floors, ceilings, and personnel, to prevent reflected light from influencing the results To minimize reflected light without casting shadows on the panel, a black baffle plate should be used After turning on the light source, adjustments to the illuminance should be made once it has stabilized An example of an appropriate measurement room is illustrated in Figure 2.
Measuring methods of 4 % window luminance
Purpose
The purpose of this method is to measure the luminance of a 4 % window of a PDP module.
Measuring equipment
The following equipment shall be used: a) driving power source; b) driving signal equipment; and c) light measuring device.
Measurement
The PDP module must be configured under standard measuring conditions in a dark room A 4% window (H/5 × V/5) white signal at 100% level should be applied at the center of the screen The luminance L DR0,04 at the center point P0 of the white window A0 must then be measured, as illustrated in Figure 3.
Figure 3 – Four per cent (4 %) window luminance measuring pattern
Measuring method of luminance uniformity
Purpose
The purpose of this method is to measure the luminance uniformity of a PDP module.
Measuring equipment
The following equipment shall be used: a) driving power source; b) driving signal equipment; and c) light measuring device.
Measurement
The PDP module must be tested under standard measuring conditions in a dark room, as illustrated in Figure 1 A full-screen white signal at 100% level should be applied to the PDP module, and the luminance \( L_i \) should be measured at specified points \( P_i \) (where \( i \) ranges from 0 to 8 or 0 to 4) on the display screen Measurements will be conducted at either five or nine points, with the selection of measuring points from \( P_0 \) to \( P_4 \) for five points or from \( P_0 \) to \( P_8 \) for nine points, as depicted in Figure 4 The luminance non-uniformity at each \( P_i \) will be calculated accordingly.
Where, luminance deviation ∆ L i is given by:
Average luminance L av for five points is given by:
Or average luminance L av for nine points is given by:
The measured results should be recorded as shown in Table 1 × 100 (%)
Table 1 – Example of luminance uniformity measurement
Measuring method of dark-room contrast ratio
Purpose
The purpose of this method is to measure the dark-room contrast ratio of a PDP module.
Measuring equipment
The following equipment shall be used: a) driving power source; b) driving signal equipment; and
Measurement
The PDP module shall be set in the standard measuring conditions and in the dark-room conditions The measuring layout is shown in Figure 1
Apply the testing input signal displaying the 4 % window A 0 having a size of H/5 × V/5 (see
To optimize the PDP module from the driving signal equipment, apply the testing input signal to achieve maximum luminance (100%) in the 4% window while ensuring minimum luminance (0%, black screen) in the remaining screen area Measure the luminance L DR0,04 at the center of the white window within the 4% region.
To test the PDP module, sequentially apply the input signal to each of the four white windows A1 to A4, as illustrated in Figure 5 Adjust the input signals to achieve maximum luminance (100%) on the selected white window while ensuring minimum luminance (0%, black screen) on the remaining areas of the display Measure the luminance \( L_{BRi_{min}} \) at the designated "luminance measuring position" \( P_0 \) in Figure 5, corresponding to the same position in Figure 3, when each window \( A_i \) (for \( i = 1 \) to \( 4 \)) is illuminated at maximum luminance.
L DRmin is defined as follows
If the above four measurements L BRimin (where i is 1 to 4) are sufficiently uniform (less than
5 % variation), it is permitted to measure only one luminance (e.g., L BR1min ) as minimum luminance L BRmin In this case the measured display pattern shall be noted on the report
Use a black baffle in case stray light from A 1 to A 4 has an effect on the minimum luminance measurement
6.3.3.4 Procedure to determine the dark-room contrast ratio
The dark-room contrast ratio (DRCR) is given as follows:
L DR1min + L DR2min + L DR3min + L DR4min
L DRmin Figure 5 – Minimum luminance measuring pattern
Measuring method of bright-room contrast ratio 100/70
General
The bright-room contrast ratio 100/70 (BRCR-100/70) is the value set in the condition where the vertical plane illuminance is 100 lx and the horizontal plane illuminance is 70 lx.
Purpose
The purpose of this method is to measure the bright-room contrast ratio 100/70 of a PDP module.
Measuring equipment
The following equipment shall be used: a) driving power source; b) driving signal equipment; and c) light measuring device.
Measurement
The PDP module shall be set in the standard measuring conditions and in the bright-room conditions The measuring layout is shown in Figure 1 and Figure 2
Apply the testing input signal displaying a 4 % window A0 having a size of H/5 × V/5 (see
Figure 3) to the PDP module from the driving signal equipment Arrange the testing input signal to obtain maximum luminance (100 %) on the 4 % window and minimum luminance
(0 %, black screen) on the other part of the screen
Measure the 4 % window luminance L BR0,04 at the centre of the white window
DRCR Luminance measuring position (same position in Figure 3)
NOTE Light one window at a time
To test the PDP module, sequentially apply the input signal to each of the four white windows (A1 to A4), each measuring H/5 × V/5 The goal is to achieve maximum luminance (100%) in the active white window while ensuring minimum luminance (0%, black screen) in the remaining areas Luminance measurements, denoted as L_BRimin (for i = 1 to 4), should be taken at the designated "luminance measuring position" P0, as illustrated in Figure 5, when each Ai is illuminated at maximum luminance.
Minimum luminance L BRmin is defined as follows
If the above four measurements L BRimin (where i is 1 to 4) are sufficiently uniform (less than
5 % variation), it is permitted to measure only one luminance (e.g., L BR1min ) as minimum luminance L BRmin In this case the measured display pattern shall be noted on the report
6.4.4.4 Procedure to determine the bright-room contrast ratio 100/70
The bright-room contrast ratio 100/70 (BRCR-100/70) is given as follows:
If the AAA colour rendering daylight white (JIS Z 9112-1990 type N-EDL) straight tube fluorescent lamp is unavailable, any alternative lamp used as the illumination source must be documented in the report, including detailed information about the lamp applied.
Measuring method of white chromaticity and chromatic uniformity
Purpose
The purpose of this method is to measure the white chromaticity and chromatic uniformity (defined as chromaticity deviation) of the display surface of a PDP module.
Measuring equipment
The following equipment shall be used: a) driving power source; b) driving signal equipment; and c) light measuring device.
Measurement
The PDP module must be configured under standard measuring conditions in a dark room, as illustrated in Figure 1 A full-screen white input signal of 100% should be applied to the PDP module to measure the white chromaticity C (x y) at designated points on the display screen, where x and y represent the CIE1931 chromaticity coordinates defined in CIE 15 Measurements can be conducted at one, five, or nine points For the display screen depicted in Figure 4, the measuring points should be selected from P0, P0 to P4, or P0 to P8, corresponding to one, five, or nine points, respectively The white chromaticity at each point P_i is denoted as C_i (x y_i), with C_0 (x_0 y_0), C_1 (x_1 y_1), and so on for the respective points.
C 8 (x 8 y 8 ), each chromaticity deviation ∆x i , ∆y i is given by:
BRCR-100/70 L BR1min + L BR2min + L BR3min + L BR4min
L BRmin The measured results should be recorded as given in Table 2
NOTE It is permitted to use the following chromaticity deviation ∆ u' i , ∆ v' i at each measuring point Pi after transforming x, y chromaticity coordinates to u', v' chromatic coordinates
Where i is 1 to 8 And u' and v' are CIE 1976 UCS diagram coordinates defined in CIE 15 Where u' = 4x / (3 - 2x +
Table 2 – Example of chromaticity measurement
Measuring method of colour gamut
Purpose
The purpose of this method is to measure the colour gamut of a PDP module.
Measuring equipment
The following equipment shall be used: a) driving power source; b) driving signal equipment; and c) light measuring device.
Measurement
The PDP module must be configured under standard measuring conditions in a dark room, as illustrated in Figure 1 Monochromatic 4% window signals (H/5 x V/5) at 100% level for the color signals R, G, and B should be applied to the PDP module (refer to Figure 3) Begin by inputting the R signal and measuring the CIE 1931 chromaticity coordinate (x R, y R) at the center of the window Repeat this process for the G signal to obtain (x G, y G) and for the B signal to get (x B, y B) Finally, connect the three points (x R, y R), (x G, y G), and (x B, y B) on the chromaticity diagram, with an example of the measurement results shown in Figure 6.
NOTE It is permitted to use the following chromaticity coordinate u', v' of CIE 1976 UCS chromaticity diagram (see CIE 15) transformed from chromaticity coordinate x, y given by:
Figure 6 – Example of the colour gamut measurement
Measuring method of module power and current consumption
Purpose
The purpose of this method is to measure the power and current consumption of a PDP module.
Measuring equipment
The following equipment shall be used: a) driving power source; b) driving signal equipment; c) AC voltmeter; d) AC powermeter; e) DC ammeter; f) DC voltmeter; and g) any other equipment required to measure maximum power u' = , 4x v' =
The measurement log must include the type or model number of the AC voltmeter, AC powermeter, DC ammeter, and DC voltmeter used, along with details of any equipment necessary for measuring maximum power.
Measurement
The PDP module must be configured under standard measuring conditions, with power measurements taken for both AC and DC sources For each power source, it is essential to document the voltage, current, and power values, along with the intended application (refer to Tables 3 and 4 for examples) The total power consumption of the module is determined by summing the powers from all sources, and the voltage applied to each circuit should align with the specifications outlined in the relevant specification sheet.
Figure 7 – Example of power and current measuring diagram
Table 3 – Example of power and current measurements
(for a module that includes an AC input)
Measured power and current for Full screen white display
2 DC 5 V system 5,10 3,13 P 2 (5,10×3,13) Signal processing etc
Table 4 – Example of power and current measurement
(for a module with DC inputs only)
Measured power and current for Full screen white display
6.7.3.2 Measurement of power and current for full screen white display
To achieve a full-screen white display on the PDP module, apply a 100% white input signal to all pixels Measurements should be taken once the currents and voltages have stabilized.
6.7.3.3 Measurement of power and current for full screen black display
To achieve a full-screen black display on the PDP module, apply a black input signal at 0% level to all pixels Ensure that measurements are taken only after the currents and voltages have stabilized.
6.7.3.4 Measurement of maximum power and current consumption
For modules where the display signal leading to maximum power consumption differs from the full-screen white display, measurements must be conducted under conditions that yield the highest power consumption Each specification sheet should clearly indicate the conditions for maximum power consumption and the methodology used for measurement.
The maximum power consumption of a PDP module varies based on its design, particularly the power limiting and protection circuits Consequently, the image displayed at peak power consumption also fluctuates Typically, PDP modules include circuits that gradually decrease display luminance and power consumption when a fixed image is shown, making it challenging to measure maximum power consumption under stable conditions Therefore, measurements should be conducted under conditions that yield maximum power consumption for the specific module design It is essential to adopt the optimal measuring method for each module design and document this method on the specification sheet.
Measuring method of module power consumption using video signal
General
The purpose of this method is to measure the module average power consumption using video signal This method reflects the method of “On (average) mode power consumption” for
TV set specified in IEC 62087, and is modified for a module measurement.
Measuring equipment
The equipment required for measurements includes a driving power source, video signal equipment such as a video playback device (e.g., DVD player) and an image processing board if necessary, as well as a DC ammeter (including integrator), a DC voltmeter, an AC watthour meter, and an AC voltmeter AC measuring equipment is utilized when some or all power supplies are integrated into the module and supplied with alternating current, while only DC measurements are needed if all power supplied to the module is DC.
Applied digital video signal
The dynamic broadcast-content video signal specified in IEC 62087 must be utilized, generated by a video playback device such as a DVD player For measurement purposes, a digital video signal is preferred; however, if it is insufficient, an analogue video signal may be used The specifics of the analogue video signal should be outlined in the relevant specifications, and the video signal levels must be calibrated to appropriate standards.
The dynamic broadcast-content video signal has a playback duration of 10 minutes Once the video playback concludes, it automatically restarts if the warm-up or measurement process is still ongoing.
Image processing board
For a PDP module with an image processing board, video signals must be directed to the board If the module lacks an image processing board, it is necessary to incorporate one, ensuring that its specifications, particularly the gamma (γ) settings, are outlined in the relevant documentation or utilize a board supplied by the manufacturer.
When using the image processing board, ensure to select the appropriate video mode—either vivid/dynamic or normal—according to the specified guidelines Document the chosen mode in the report, and refer to the relevant specifications for detailed definitions of the selected mode.
NOTE Vivid/dynamic mode means the brightest mode of the module.
Measurement
The PDP module shall be set in the standard measuring conditions The video mode selection mentioned in 6.8.4 is set as defined in the relevant specification
The PDP module shall be set in a screen size mode such that the active area of the video input signal fills the entire screen
The power supplied to the module is measured using DC ammeter(s) with an integrator, while AC powermeter(s) are substituted with AC watthour meter(s) For each power source, it is essential to document the voltage, average power values, and the intended application of the average power, as illustrated in Table 5 The total average power from all power sources represents the module's power consumption when utilizing video signals.
The voltage applied to each circuit shall be the standard voltage specified in the relevant specification
Table 5 – Example of measurement results of module power consumption using video signal
2 DC 5 V system 5,01 0,522 W 2 (5,01 × 0,522) W 2 ×60/10 Sequence processing etc
Total Module power consumption using video signal: P video P video = (W 1 +W 2 +W 3 +…+… ) × 60/10 Remark: No image processing board is included Applied image processing board: ##
1 As the play back time is 10 min, the module power consumption using video signal is the sixth (60/10) of integrated power (W 1 +W 2 +W 3 +…+…)
6.8.5.2 Warm up condition of PDP module
Measurements should be conducted once the PDP module reaches a stable power consumption state Specifically, this involves ensuring the module has been in the "off" or disconnected mode for at least 1 hour, followed by a minimum of 1 hour in an active state.
The "on" mode must be completed within a maximum of 3 hours, during which the dynamic broadcast-content video signal should be displayed continuously For PDP modules that stabilize within 1 hour, the duration may be shortened, provided that the resulting measurements are within 2% of those obtained using the specified durations.
To begin, apply the broadcast-content video signal and activate the PDP module to display the video Once the PDP module stabilizes, conduct a power measurement over a duration of 10 minutes, focusing on the integrated power of the entire video program If the power consumption values from the first playback are confirmed to match those of the second playback within a 2% margin, proceed with the measurement during the first playback.
Module power consumption, represented as P video, is calculated by summing the integrated power used during the entire playback of the video signal and dividing it by the total playback time.
Measuring method of module luminous efficacy
Purpose
The purpose of this method is to measure the module luminous efficacy of a plasma display.
Measuring equipment
The equipment required for measurements includes a driving power source, driving signal equipment, a light measuring device, a DC ammeter, a DC voltmeter, an AC powermeter, and an AC voltmeter AC measuring equipment is utilized when some or all power supplies are integrated into the module and provide alternating current, while only DC measurements are necessary if the module is powered entirely by DC.
Measurement
The PDP module must not include a front transmission filter; if a panel features a built-in filter, this must be explicitly indicated Measurements should be conducted under standard conditions and in a dark room, as illustrated in Figure 1 A white input signal at 100% level should be applied to all pixels within the PDP module.
6.9.3.2 Measuring points of luminance and chromaticity
Luminance measurements can be conducted at either five or nine designated points When using five points, measurements are taken from P 0 to P 4, as depicted in Figure 4 In the case of nine points, measurements extend from P 0 to P 8 Additionally, chromaticity C 0 (x 0 y 0) is specifically measured at point P 0.
The mean luminance is given by the following formulas, where luminance at a point P i (where i is 0 to 4 or i is 0 to 8) is L i :
For measurements at five points:
For measurements at nine points:
6.9.3.3 Measurement of module power consumption
Measure the AC power from the built-in power supply and the power from external DC sources, recording the voltage, current, and power values for each source along with their intended applications The total power consumption of the module is the sum of the powers from the external sources, with the voltage applied to each circuit adhering to the standard specified in the relevant specification sheet.
6.9.3.4 Calculation of module luminous efficacy
The module luminous efficacy η m of the plasma display can now be calculated using the following equation: where
L av luminance without front transmission filter (cd/m 2 )
The measurement report must include the following elements: a) the luminance and chromaticity recorded during the assessment of module luminous efficacy; b) the power consumption of each power source measured during the evaluation of module luminous efficacy.
Measuring method of panel luminous efficacy
Purpose
The purpose of this method is to measure the full screen panel luminous efficacy and the 4 % window panel luminous efficacy of a plasma display panel
The luminous efficacy of a panel is influenced by factors such as gas discharge, phosphor performance, and electrical line losses, but it excludes power losses occurring in the sustain circuit.
Measuring equipment
The following equipment shall be used: a) driving power source; b) driving signal equipment; c) sustain drivers (-x and -y); η m = (lm/W) πSL av
9 d) DC voltmeter; e) DC ammeter; f) light measuring device; g) oscilloscope; and h) any other required equipment
Figure 8 shows an example system diagram of sustain power measurement
Figure 8 – System diagram of sustain power measurement
A panel checker can serve as a substitute for equipment b) and c), followed by the use of a pattern generator The checker must possess the same or equivalent electrical circuits as the module and operate in a manner consistent with the module's functionality.
The luminous efficacy of a panel mounted on a PDP module is determined by measuring the current and voltage supplied to the module's sustain drivers In cases where a DC power source is absent, it is essential to connect an appropriate external DC power source to ensure accurate measurements.
For accurate measurements, it is essential to use an appropriate external DC power source instead of the module's built-in power supply Additionally, the module may need to be reconfigured to effectively monitor current and voltage If required, incorporating an extra control unit or program can help maintain stable driving conditions within a fixed subfield structure, even as the display pattern transitions from full screen white to full screen black.
Panel conditions
The plasma display panel shall not have any front transmission filter mounted on it If a panel has a built-in filter, this shall be clearly stated
All sustain electrodes are electrically connected to x-sustain driver(s) and all scan electrodes are electrically connected to y-sustain driver(s) All address/data electrodes should held at
Driving power supply (DC source)
The IEC 51/12 standard specifies the use of constant pulsing or non-pulsing voltage, which can be achieved by either grounding all address/data electrodes or linking them to the address/data drivers It is essential to document the connection method and voltage waveform of the address/data electrodes in the report.
Driving waveform
The sustain drivers produce a sustain pulse voltage waveform that closely resembles the waveform in the PDP module To decrease panel luminance and total power to match the actual module levels, an intermittent sustain-pulse-burst should be utilized, with the driving signal equipment depicted in Figure 9 This equipment is responsible for generating the sustain frequency, burst ratio, and burst frequency, which should be set at 50 Hz or higher.
When utilizing the panel checker, it is essential to configure the checker variables to practical or preset values as specified in the relevant documentation, ensuring that the driving waveform aligns closely with that of the module.
When the module is used, the variables of the module shall be set at practical values or preset values defined on the relevant specification
The sustain pulse waveform must be measured and documented in the report, including details such as the sustain frequency (sustain cycle), burst rate, and burst frequency Any changes in the waveform applied should also be recorded Additionally, when utilizing the panel checker or PDP module, the corresponding values must be included in the report.
NOTE 1 Detailed waveform should be described, when it affects the panel luminous efficacy
NOTE 2 Burst ratio is the ratio of pulse burst time and a burst cycle time
Figure 9 – Driving system and waveform
Applied display patterns
The following display patterns should be selected: a) full screen white; b) 4 % white window (see Figure 3); c) full screen black.
Measurement
The plasma display panel must be positioned under standard measuring conditions within a darkroom environment The setup is illustrated in Figure 1, where the panel is located in the PDP module's designated area Additionally, the driving electronics and power measurement equipment are arranged as depicted in Figure 8.
Driving signal equipment x-sustain driver y-sustain driver c) Intermittent sustain-pulse burst waveform
Blanking time Pulse burst time b) Driving signal
All scan electrodes (y) a) Driving system
When the panel checker is used, the plasma display panel on the checker shall be set in the place of the module
When the PDP module is used, the module shall be set at the position in Figure 1
6.10.6.2 Measuring points of luminance and chromaticity
6.10.6.2.1 Measuring points on full screen white display
Luminance measurements can be conducted at either five or nine designated points When using five points, measurements are taken from P 0 to P 4, as depicted in Figure 4 In the case of nine points, measurements extend from P 0 to P 8 Additionally, chromaticity C 0 (x 0 y 0) is specifically measured at point P 0.
The mean luminance is given by the following formulas, where luminance at a point P i (where i is 0 to 4 or i is 0 to 8) is L i :
For measurements at five points:
For measurements at nine points:
6.10.6.2.2 Measuring point on 4 % white window
The luminance L 0 and the chromaticity C 0 (x 0 y 0 ) shall be measured at the centre of the 4 % window
To achieve the desired luminance for each display pattern, configure the display to either full screen white or a 4% white window Next, adjust the sustain frequency, burst frequency, and burst ratio in accordance with the relevant specifications or appropriate values.
Input the driving waveform with 0 V DC input level from the driving power supply Increase the
To ensure optimal performance, adjust the DC voltage until the last cell emits light, disregarding any defective cells If the power consumption of the sustain drivers exceeds their limits, decrease the burst ratio until it falls within acceptable levels Subsequently, lower the DC voltage to the specified level consistent with the module's requirements Once the burst ratio is reduced, revert it to the specified value After the current stabilizes, measure and document the luminance at designated points on the screen, the chromaticity at the center, and the current and voltage supplied to the sustain drivers.
When the panel checker or the PDP module is used, input a full screen white signal of level
100 % or input a 4 % white window signal of level 100 % surrounded by black screen of level
Once the observed current is stabilized at 0%, measure and document the luminance at designated points on the screen, as well as the chromaticity at the center of the screen.
4 % window, and the current and the voltage supplied to the sustain driver(s), while the luminance of addressing shall be small enough to be ignored
After completing the on-state measurement, reduce the voltage sufficiently to halt light emission from all cells Subsequently, restore the voltage to the original level used during the on-state measurement and verify that no cells are emitting light, indicating no discharging cells Measure the current and voltage; if any cells, including defective ones, are discharging, restart the off-state measurement If the off-state measurement fails to prevent discharging cells, revert to the on-state measurement with a lower operating voltage.
When the panel checker or the PDP module is used, input a full screen black signal of level
To ensure accurate measurements, confirm that no cell emits light and measure the current and voltage supplied to the sustain driver(s) while maintaining consistent subfield structure, including the number of sustain pulses and sustain voltage, as in the on-state measurement If the checker/module has automatic power control, it should be disabled; if not feasible, implement an additional control unit or program to maintain a fixed driving voltage and subfield structure while varying the display pattern.
6.10.6.5 Calculation of panel luminous efficacy
The full screen panel luminous efficacy (η p,fs ) and the 4 % window panel luminous efficacy (η p,0,04 ) are calculated by the following equations: η p.fs = πL av S/P (lm/W) where
S is the screen area of the panel (m 2 );
P is the power consumption for emission (W), that is, difference between the sustain power for white (P sus,W ) and the sustain power for black (P sus,B );
L av is the average luminance of the panel (cd/m 2 ) and η p,0,04 = πL 0,04 S 0,04 /P (lm/W) where
S 0,04 is the area of the 4 % window on a panel (m 2 ), which should be actually measured
P is power consumption for emission (W), that is, difference between the sustain power for 4 % white window (P sus,0,04 ) and the sustain power for full screen black (P sus,B );
L 0,04 is the luminance of the 4 % white window (cd/m 2 )
The measurement report must include the following key items: a) panel luminous efficacy (\$η_p fw\$ and/or \$η_p 0.04\$); b) luminance and chromaticity measurements; c) power consumption of the sustain power source; d) details on any built-in filter and its spectral transmissivity; e) sustain voltage; f) sustain pulse waveform, sustain frequency, burst rate, and burst frequency, supported by photocopies or printouts from the oscilloscope; and g) the use of a panel checker or PDP module.
Clause cross-references from the previous edition of
IEC 61988-2-1:2002 and IEC 61988-2-2:2003 to IEC 61988-2-1:2011
A.1 Previous edition of IEC 61988-2-1: 2002 and IEC 61988-2-2: 2003
The revised edition of IEC 61988-2-1 and IEC 61988-2-2 introduces two new measurement items: a) IEC 61988-2-1, which focuses on optical measuring methods for plasma display panels, and b) IEC 61988-2-2, which addresses optoelectrical measuring methods Additionally, the standard includes further measuring items to enhance measurement accuracy and consistency.
1) Measuring method of module power consumption using video signal, and
2) Measuring method of panel luminous efficacy
Table A.1 shows the relation between the clauses of new and old documents
The article presents a comparison of clauses from the new IEC 61988-2-1:2002 and IEC 61988-2-2:2003 standards with their corresponding old clauses Key sections include the scope, normative references, and definitions of terms It details the structure of measuring equipment and standard measuring conditions, including environmental and lighting conditions Specific adjustments for colour plasma display modules and warm-up conditions are outlined, along with conditions for measuring equipment The measuring methods section covers various techniques, such as measuring window luminance, luminance uniformity, contrast ratios in both dark and bright rooms, and assessments of chromaticity, colour gamut, and module power consumption.
IEC 61988-2-1, Plasma display panels – Part 2-1: Measuring methods - Optical
IEC 61988-2-2, Plasma display panels – Part 2-2: Measuring methods - Optoelectrical
CIE 44-1979, Absolute Methods for Reflection Measurements