Competitive LCD modules/ LCD Displays @ Aoran Company

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HOW TO SELECT LCD
2000-9-11 13:11:42
Now?we present you a guideline to select a LCDs to meet your requirements in
many aspect, such as cost, performance, and utility, etc, hope it can help you
have a good understanding on the characteristics and property of a LCDs.
Here we categorize LCDs from different prospective of application as followings:1.Table 1
Display type
Reflective
Transmissive
Transflective
Application
location
Bright
circumstance
as always
Dim or dusky
circumstance

 

Sometime in a bright circumstance, and
sometime in a dusky circumstance
Contrast
ratio
Very good
Very Good with backlit
Good in bright circumstance, good in
dusky circumstance if with a backlit
Power
consumption
small
high
Average
?
backlit
No need
necessary
Necessary in dusky circumstance
Cost factor
lower
lower
Higher (expensive polarizer )

2. Table 2
Display mode
negative
positive
character
White character in
black background
Black character in white background
backlit
necessary
Depend upon the operationcircumstance (transflective
type)
cost
higher
lower
contrast
good
better
3.Table 3
Operational
mode
duty
TN
HTN
180 twist STN
220 twist STN
240 twist STN
1/1-1/8
 
 
 
 
1/8-1/16
 
 
1/16-1/64
 
 
 
1/64-1/240
 
 
 
 
1/240-1/480
 
 
 
 

Note:1). For a good contrast, the T-V curve should be steeper enough, as the duty increase,
a steeper T-V curve is required. From TN to 240 twist STN, the steepness of T-V curve
gets steeper and steeper.2) From TN to 240 twist STN, the response time become slower and slower, but the contrast gets better and better, and view cone gets wider and wider if the duty is determined, but the cost of LCD gets higher and higher as well.3) the “v”” is our recommendation for you.4. Table 4
correlation
6 o’clock
12 o’clock
9 o’clock
3 o’clock
others
View form up
 
 
 
 
View from down
 
 
 
 
View from left
 
 
 
 
View from  right
 
 
 
 
View from otherdirection
 
 
 
 

Note:Hereby inform you the most used term of view angle in LCD sector, hope can benefit your communication during your business contact.Pls fill up the form for your business contact based the knowledge above
1) Display mode
      a.Positive          b. Negative
2)  Display type
      a. Reflective      b. Transmissive      c. Transflective
3)  Operational mode
      a. TN    b. HTN       c. 180 twist STN    d. 220 twist STN     e. 240 twist STN
4)    Display mode( here only applicable for STN)
      a. yellow and green mode       b. blue mode       c. gray mode       e. FSTN mode
5)  Driving condition
Duty:            Bias:           Frequency:               Vop:
6)  Viewing angle
a.  6 o’clock     b. 12 o’clock    c. 9 o’clock     d. 3 o’clock     e. others
7) Operation temperature Range
a Normal temperature ( 0 C-------------60C)b. Wide temperature       (-20C------------70C)
c. Super wider temperature( -30C------80C)
8) Connection method
a. Pin          b. Elastic rubber         c. Heal seal paper
9)LCD thickness
a. 1.1x2 mm     b. 0.7X2 mm        c. 0.55x2 mm       d. 0.4x2 mm
10)Colour
a. Monochrome  b. Printing colour   c. Multi-colour( CIE mixing colour)
11) LCM
a. COB     b. TAB   c. COG     d. COF
After you fill out this form, we can design a LCD or LCM perfectly meet your all
kinds of requirement, pls take into consideration of cost, performance, and utility
as an integral consideration. 
Attachment:

LCD performance term.

   1. Contrast: the comparison of black state and the white state, as indicated as a
parameter of Ton/Toff.( T: abbrev. Transmittance)
   2. Response time: including switch on time and switch off time, it is vital for
displaying a moving picture, the shorter, the better.
   3. View angle: the range of being readable of the displayed information (Cr>3),
pls keep in mind the contrast is a view angle dependence parameter.
   4.Operation temperature range: a temperature range in which a LCD can normally
display information.
   5.Hue: the color of LCD in off-state.
   6.lifetime: the time of LCD can normally operate.
   7.Operation voltage: the optimal voltage to drive a LCD to display information
perfectly.
 



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