Viewing Mode
  VIEWING MODE describes how a LCD manipulates polarized light to create an image. In order to select the proper viewing mode it is necessary to consider the LCD's typical ambient lighting conditions.


     

DISPLAY TYPE MODE BACKGROUND
COLOR
BLACKLIGHT
REQUIRED
REMARK

REFLECTIVE


POSITIVE

WHITE

NO

Out door applications
TRANSFLECTIVE
POSITIVE

WHITE

YES / NO

Display can be used with the backlight on or off


TRANSMISSIVE


NEGATIVE

BLACK

YES

Typical for indoor application. The backlight has to be always on



 

Reflective Mode

LCD's employing the reflective viewing mode produce dark characters on a light background.
(Positive Image) When a segment is turned off, ambient light travels through the following layers:

1. The vertically aligned front polarizer located on the face of the display.
2. The indium tin oxide segment pattern on the rear of the front glass substrate.
3. Polyimide layer (alignment layer)
4. The liquid crystal material where it is twisted 90º
5. Polyimide layer (alignment layer)
6. The ITO defined commons on the front of the rear glass substrate.
7. The horizontally aligned rear polarizer behind the rear glass substrate.
8. And finally onto a reflector that returns it along the same path. (See diagram E)

A positive image display has front and rear polarizers that are said to be "OUT OF PHASE" with one another, or "crossed polarized" by 90º. When a segment is TURNED ON, the LC molecules won't twist polarized light. Therefore, the light is OUT OF PHASE when it reaches the rear polarizer preventing it from passing through to the reflector. Because the light is not reflected, a dark or positive image is created for that particular segment.


Sunlight Readable Display

Modern sunlight readable displays utilize the transmissive technologies engaged by sandwiching the cells between polarizing layers. The polarizing layers support the LCD display by allowing the proper mix of wave lengths into the display to be combined with a higher output backlight. The net result is a true sunlight readable display.(See all Sunlight Readable Displays Products)



Benefits
  • Readable under all lighting conditions to include direct Sunlight
  • Enhanced contrast ratio for both indoor and outdoor conditions
  • Utmost indoor color saturation, brightness, and viewing angle
  • Full mechanical and electrical compliance with the existent system
  • Power saving and backlight life preserving in outdoor applications
  • No extra heat generation even when viewed at higher brightness




Transflective

Transflective LCD technology can be applied to selected TFT LCD panels, enhancing the LCD with a reflective functionality. With the imposed reflective characteristic, the modified LCD can reflect ambient light passing through the LCD cell and harness the reflected light beams as its source of illumination. The stronger the ambient light is, the brighter the LCD will appear. As a result, the modified LCD is viewable under lighting conditions including direct sunlight.

Transflective LCD modules hold both transmissive and reflective properties; the method of image display depends upon the conditions of the ambient environment. The display uses a backlight with a transmissive property in dark environments, and uses external light with a reflective property in bright environments.



Technology