Qualcomm’s mirasol displays are a technology breakthrough that deliver substantial performance benefits over competing display technologies. The reflective displays, based on interferometric modulation (IMOD) technology, offer a significant reduction in power consumption as compared to other display technologies, while extending device battery life, enabling new features, and reducing environmental impact. Moreover, these displays require no supplemental lighting in most ambient lighting environments and can be viewed in bright sunlight.
The butterfly inspired mirasol display dramatically increases feature options for users, design space available to developers, revenue streams for carriers, and differentiation for manufacturers of mobile devices.
The mirasol display's abilities to conserve energy through bistability and elimination of the backlight as a source of illumination compliment the display's fundamental ability to be viewed in direct sunlight, indeed to be consistently viewed in almost any environment, without degradation of contrast ratio or color depth.
Typical displays (generally categorized as "Emissive") generate their own illumination, which obscures in various lighting and becomes washed out in diffuse sunlight, and is often overpowered in direct sunlight. In other words, an emissive display's viewing quality deteriorates as ambient conditions get brighter. The fundamental cause of this problem is that the light source, typically a backlight, is competing with the ambient light causing distortion.
mirasol displays are made up of reflective microscopic mirrors and use ambient light as the source of illumination . They stay bright and crisp as the light source gets brighter. That means you don’t have to run from the sun.
There are two primary sources of the energy savings from mirasol displays. Firstly, mirasol displays utilize microscopic mirrors to reflect ambient light. This means mirasol displays do not need to use a backlight or any other source of illumination, which is one of the largest components of the typical energy drain in today's backlit displays.
The other key advantage of the mirasol display's design is its bistable nature, which allows for near-zero power usage in situations where the display image is unchanged. This means that mirasol displays benefit from considerable power savings, especially compared to displays that continually refresh, such as LCDs.
The bistability of mirasol displays comes from the inherent hysteresis derived from the technology's electro-mechanical properties. More specifically, it derives from an inherent imbalance between the linear restorative forces of the mechanical membrane and the non-linear forces of the applied electric field. Sounds complicated, right? It's really not. The electro-opto-mechanical behavior of mirasol display's MEMS structures is hysteretic in nature and provides a built-in "memory" effect similar to many active-matrix displays.
The membrane is held in the open state by applying a voltage. By applying a short write voltage pulse, the membrane will collapse and stay in that state as the voltage returns to open levels. In order to return to the open state, a short negative unwrite pulse is applied, causing the membrane to snap back into the open state.
Unlike other eReader type displays, mirasol displays is able to meet modern desires of dynamic content, as well as the sensibilities for a more traditional reading experience.
Since visible light wavelengths operate on the nanometer scale (i.e., 380nm to 780nm), the deformable IMOD membrane only has to move a short distance—a few hundred nanometers—in order to switch between two colors. This switching happens extremely fast, on the order of tens of microseconds. This switching speed directly translates to a video rate-capable display with no motion-blur effects.
mirasol displays’ nature inspired method of creating color is nothing short of genius. Put simply, they generate color by mimicking the principles seen in butterfly wings or peacock feathers. It’s a natural palette: iridescent, metallic, shimmering and brilliant.
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