JVC PD-Z50DX4/S Service Manual page 7

2.4 TECHNICAL INFORMATION
2.4.1 PDP STRUCTURE AND CHARACTERISTIC
This unit uses the flat type panel PDP (Plasma Display Panel), instead of the conventional CRT (Cathode Ray Tube), as a display unit.
2.4.1.1 PIXEL (CELL) ARRAY
PDP is constructed by sealing the xenon, which emits neon and ultraviolet rays for discharging purpose, in between the electrodes
lay on the front glass substrate and rear glass substrate.
One pixel is composed of 3 RGB cells, with cell pitch of 0.270mm (1 pixel 0.810mm) horizontally and 0.810mm vertically.
The cell is arrayed in each RGB color as shown in Fig. 1. One pixel is formed by interlacing each RGB color cell.
One cell size is 0.270mm horizontally and 0.810mm vertically.
Direction
Horizontally
Vertically
No.1
Pixel line
No.2
Pixel line
No.767
Pixel line
No.768
Pixel line
2.4.1.2 PIXEL DEFECTS
Though PDP is made by means of ultra precise technology, there are cases whereby not all pixels (cell) will function properly. In some
cases, there may be defective pixels that do not light at all or the ones that always light on.
There are 3 types of Pixel defects, [Bright Dot Defects], [Dark Dot Defects] and [Flicker Dot Defects], as defined respectively in the
following:
(1) BRIGHT FAULT
In this pixel fault, a cell that should not light originally is lighting on and off.
For checking this pixel fault, input ALL BLACK SCREEN and find out the cell that is lighting on and off.
(2) DARK FAULT
In this pixel fault, a cell that should light originally is not lighting or lighting with the brightness twice as brighter as originally lighting.
For checking this pixel fault, input 100% of each R/G/B colour and find out the cell that is not lighting.
(3) FLICKER FAULT
In the pixel fault, a cell that should light originally or not light originally is flashing on and off.
For checking this pixel fault, input ALL BLACK SCREEN signal or 100% of each RGB colour and find out the cell that is flashing on
and off.
No.1 No.2
Pixel Pixel
sequence sequence
B G R B G R
B G R B G R
B G R B G R
B G R B G R
0.810mm
(Horizontally) Pixel pitch
No.1365
Pixel
sequence
B G R B G R
B G R B G R
B G R B G R
B G R B G R
B Cell
1 pixel
G Cell
(1 dot)
R Cell
(Horizontally) Cell pitch
Fig.1
No.1366
Pixel
sequence
0.810mm (Vertically)
Pixel pitch (Cell pitch)
0.270mm
(No.YA229)1-7