Anti-Newton Ring FilmPrevent interference fringes in Newtonian rings
- Resistive Type
Anti-Newton Ring Film is a film that can prevent degradation of appearance due to Newton rings (interference fringes) that may occur in resistive touchscreens.
Reduce the occurrence of Newton rings due to air gaps
In resistive touchscreens, rainbow-colored stripe patterns (Newton rings) are generated when reflected light from the ITO surface of the upper film interferes with reflected light from the ITO surface of the lower glass. It rarely occurs in natural light outdoors or under incandescent lamps, etc., but is mainly visible under fluorescent lamps (especially three-wavelength fluorescent lamps).
The principle of anti-Newtonian rings
Newton ring interference fringes
A resistive touchscreen is a resistive touchscreen in which upper and lower ITO-coated films or glasses are placed opposite each other to create a gap between them to detect and locate the contact between the electrodes due to pressure. The light reflected from the pressure-curved upper and lower planes interfere with each other in the air gap between them, resulting in the display of round interference fringes.
Diffuse the reflected light. Reduces generation and suppresses flickering
The ITO transparent conductive film is treated with an uneven rough surface to prevent it from aligning with the optical axis, suppressing Newton rings and diffusing reflected light. By optimizing the rough surface shape, the anti-Newton Ring (ANR) characteristics are reduced and flicker is controlled at the same time.
Use of Examples
Category Cases Products used 9.4-inch 4-wire resistive system
Anti-Newton ring film
Recruitment Industry Office Equipment Uses OHP Conference System Scene Pen operation
OHP conferencing system to project images at meetings and present them to the audience. A 4-wire resistive touchscreen, which requires pen input and does not depend on the object of operation, was selected. The dot spacers are smaller than the standard ones to facilitate smooth pen input. However, there was a concern that the smaller dot spacer would reduce the distance between the upper ITO film and the lower ITO glass, causing interference fringes (Newton rings) due to the fluorescent lights in the conference room, so a change to a film with an anti-Newton ring film function was made.