ViewSonic CDE4302 User Manual

17
8. Panel Defect Policy
8.1. MURA
Dark spots or patches may occasionally appear on some liquid crystal display (LCD) panels.This is known
within the industr y as Mura, which is a Japanese term for “unevenness.” It is used to describe an irregular
pattern or area in which uneven screen uniformity appears under certain conditions. Mura is a result of the
deterioration of the liquid crystal alignment layer and is most commonly caused by long-term operation under
high ambient temperatures. It is an industry- wide phenomenon and Mura is not repairable. It is also not
covered by our warranty terms.
Mura has been around since the introduction of LCD technology and with screens getting bigger and in
operation 24/7, many displays are running in low light conditions.This all adds to the possibility of Mura
affecting displays.
HOW TO SPOT MURA
There are many symptoms of Mura and also multiple causes. Several of these are listed below:
• Impurities or foreign particles in the crystal matrix
• Uneven distribution of LCD matrix during manufacturing
• Non-uniform luminance distribution of the backlight
• Panel assembly induced stress
• Flaws within the LCD cells
• Thermal induced stress - high temperature operation over long periods of time
HOW TO AVOID MURA
Although we can not guarantee the complete eradication of Mura every time, in general the appearance of
Mura can be minimized by these methods:
• Lower the backlight brightness
• Use a screen saver
• Reduce the ambient temperature around the unit
8.2. Image Sticking
Image sticking judgment standard
Initial Pattern Time Judgment PTN Judgment standard
Mosaic (8×6)
1Hr
127 Gray
• isappear within 10Min’
• ok level: under 2 leve

ViewSonic CDE4302 Specifications

General

Panel life	30000 h
Panel type	TFT
Matrix type	-
Response time	6.5 ms
Display diagonal	43 \
Display brightness	350 cd/m²
Display technology	LED
Native aspect ratio	16:9
LED backlighting type	Direct-LED
Contrast ratio (typical)	3000:1
Display number of colors	16.78 million colors
Display diagonal (metric)	109 cm
Active display area (W x H)	940.9 x 529.25 mm
Console port	RS-232
Package weight	12.2 kg
Quick start guide	Yes
RS-232 input ports	1
Network controllable	RS232
Depth (without stand)	59.9 mm
Weight (without stand)	8700 g
USB version	2.0
HDMI version	1.4
USB connector type	USB Type-A
Orientation	Horizontal
Product color	Black
Product design	Digital signage flat panel
Panel mounting interface	200 x 200, 400 x 400 mm
RMS rated power	20 W
AC input voltage	100 - 240 V
AC input frequency	50 - 60 Hz
Power consumption (standby)	0.5 W
Power consumption (typical)	105 W
12200 g	Weight of the packaged product in gram.
Package depth	159 mm
Package width	1070 mm
Package height	696 mm
Cables included	AC, RS-232, VGA
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	20 - 80 %

Weight and Dimensions

Width	968.2 mm
Height	559.4 mm