Technical Center

How to select the LCD technology

Selecting LCD Display Technology

Here is a guideline to select a LCDs to meet your requirements in many aspects, such as cost, performance, and utility. We hope it can help you have a good understanding on the characteristics and properties of 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 operation
circumstance (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 from 
up
  ●               
View from
down
●                  
View from 
left
    ●             
View from 
right
      ●         
View from
other 
direction
       
Note:
This is the most used term of view angle in LCD sector. We hope it will benefit 
your communication during your business contact with us.
Please fill the form for your business contact based on the knowledge above.

Sample order requirement form

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 terms.

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), please keep in mind the contrast is a view angle dependent 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.
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 operation
circumstance (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
other 
direction
       
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.

Sample order requirement form

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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