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Optical Bonding Technology

分類：科技新知＆自然科學 2009/10/01 10:12

Optical Bonding

Technology

Where is it useful?

•    High Ambient lighting (Sunlight) conditions

•    Any situation where a Touchscreen is used

•    Any situation where a Protective cover is used

•    If the display has to be IP or NEMA rated (for protection from water, dust, etc)

•    If the LCD is vulnerable to mechanical shock or vibration

•    Where the display is operating at the high end of it’s market

•     

How it works - Basic Principles 1

     •    CR = Contrast Ratio (typically >200:1)

•    As referred to in LCD panel manufacturer spec sheets

•    Really only applies to measurements taken in a dark room with no ambient lighting (reflections).

•    Often does not take account of the angular distribution of light from an LCD panel

High Brightness LCD panel

What about if a front surface is required?

•  A front glass will have a large negative impact on the visible contrast

Includes Touchscreens, Anti-vandal glass, Privacy filter, moisture protection etc.

•  Every interface (glass to air and air to glass) will lead to a reflection of about 5% of the light

 AR coatings

Using the bonding Solution instead

An additional layer of ‘bonding material’ effectively removes two of the reflective surfaces

Use AR coating and Bond together 

Sunlight Readability – Alternatives to bonding

•    ‘Active’ brightness enhancement

–    Causes Thermal issues (Clearing point of LCD panel)

–    Increased power consumption

–    Raises black level as well as White (inefficient)

•    Simple AR coating (air gap or laminated)

–    Reduces surface reflections but does not give ‘sunlight readability’

–    Air gap can lead to greenhouse effect with solar loading (thermal issues)

–    Inefficient use of AR treatment

Best Solution ?

Best current solution is a combination of all three. Addition of more backlighting power and bonding of optically enhanced glass

Ruggedization

Key mechanical / non-optical benefits of bonding

•    Allows for fully sealed and mechanically toughened front surface with no optical degradation

•    Increased resistance to shock and vibration for the fragile LCD glass component – due to bonding material itself.

•    Removal of any risk of dust behind the front cover/touchscreen etc.

•    Removal of screen front greenhouse effect

•    Removal of the front screen condensation issue for sealed front covers

•    Removal of parallax effect can enable new designs

Shock and vibration resistance

•    Bonding material is jelly like, a perfect shock absorber

•    Dampens any movement of the panel

Screen Contamination

•    Dust and dirt

•    Impair optical performance

•    May require difficult cleaning operation even the removal of the touchscreen / front cover

•    Screen front condensation during temperature changes

Bonding Technology

Bond Differentaiating factors

All the benefits of bonding +

•    Cost effective

•    Removable

•    UV proven (5 year lifecycle)

•    Fully scalable

•    Large panel sizes

•    Low toxicity environmentally friendly materials

•    Can offer a bonded solution to fit most existing bezel openings (no re-design required)

•    A Wide selection of options for the bonded surface

 Providing Items

•    Plain Glass

•    AR glass

•    Polycarbonate

•    ITO EMI shields

•    Any type of touch panel

OR

•    Bond customer consigned materials

As a partner

•    30 years of experience in industrial displays

•    Worldwide Manufacturing capability

•    NO minimum order quantity

•    Assistance in reducing the total cost of ownership

•    Expert knowledge on panel and system selection

Complete Solutions

Examples:

Railways PID –Holland 

Marine Displays

Theme Park

Bullring Shopping center 65” LCD Panel

  Military

Tablet pc 

Double layers bonding

Contact Person:

Mr. Frank Huang

Mobile: +886-988-238-989

email: frank88.huang@gmail.com