JVC PD-42WV74 Service Manual page 7

2.2 TECHNICAL INFORMATION
2.2.1 PDP (PLASMA DISPLAY PANEL) DESCRIPTION
2.2.1.1 CAUTION
Although a PDP is made with highly advanced precision, this does not necessarily mean all of the cells operate correctly.
The PDP inevitably includes cell that do not light or light constantly.
If the specifications (PDP performance) are unclear at the time of shipment, an adequate description cannot be conveyed to the
customer. In event of inquiries from customers regarding PDP performance, check the following specifications in order to offer a
suitable reply.
2.2.1.2 CELL ARRANGEMENT
The PDP is constructed of front and rear glass substrates provided with respective discharge electrodes. Between these, neon for
discharging and xenon for generating ultraviolet rays are enclosed.
One picture element (pixel) is composed of Red, Green and Blue (RGB) cells. The cell pitch is 0.365mm horizontal (1.095mm per
pixel) by 1.110mm vertical.
As shown in Fig. 1, the cells are arranged for each R / G / B colour. A pixel consists of each cell of R/G/B/ colour. The size of a cell is
0.365mm horizontally and 1.110mm vertically.
Direction
Horizontal(H)
Vertical(V)
1st pixel
B
line
2nd pixel
B
line
479th pixel
B
line
480th pixel
B
line
2.2.1.3 PIXEL FAULT
There are three pixel faults - bright fault , dark fault and flicker fault - that are respectively defined as follows.
(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.
1st pixel 2nd pixel
array array
G R B G R
G R B G R
G R B G R
G R B G R
One pixel
H 1.095mm
(1dot)
Pitch of pixel
Fig.1 PIXEL (CELL) ARRANGEMENT
852th pixel
851th pixel
array
B G R B
B G R B
B G R B
B G R B
B cell
G cell
H 0.365mm
R cell
Pitch of cell
array
G R
G R
G R
V 1.110mm
Pitch of pixel
(Pitch of cell)
G R
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