Flexible screens are a new type of glasses waiting to be integrated.
Flexible screens are based on OLED technology, using flexible plastic as a substrate. They can be freely bent, folded, and even become transparent. They will become a new medium extending human vision. Although currently facing challenges in cost and yield, they may bring disruptive applications in the future.
The working principle of flexible screens: The core technology of flexible screens is based on OLED (Organic Light Emitting Diode), and its working principle is fundamentally different from that of traditional LCD (Liquid Crystal Display):
Liquid Crystal Limitations: The core layer of an LCD screen is liquid crystal, which does not emit light itself but displays images by blocking light. Under voltage, the liquid crystal changes its crystal shape, thereby changing the vibration plane of light. When light leaves the liquid crystal layer, if the vibration plane matches a second polarizer, the light appears on the screen; otherwise, it cannot reach the screen. Therefore, LCD screens require an external light source and a complex polarizer structure, and the substrate is usually rigid glass, making bending or folding difficult.
OLED Advantages: The core layer of an OLED is composed of organic polymers. When power is applied, the emitting layer has free electrons, and the conductive layer has holes. At the boundary between the two layers, electrons fill the holes, releasing energy in the form of photons, completing the light emission process. This organic layer is thinner, lighter, and more flexible than the liquid crystal layer, and can use flexible plastic as a substrate, eliminating the need for rigid glass. Therefore, OLED screens can be freely bent and folded, and even achieve transparent displays through transparent substrates, cathodes, and anodes.
The Value and Demand of Flexible Screens
Although flexible screens have not yet seen a "killer application," their potential value is gradually emerging:
Breaking Physical Limitations: The bendable and foldable nature of flexible screens enables them to accomplish tasks that are difficult for traditional screens. For example, LG's patented curved transparent automotive display can be integrated into the steering wheel or windshield, providing real-time information without obstructing the view.
Solving the Contradiction Between Portability and Large Screens: Traditional large-screen devices (such as tablets and computers) are poorly portable, while small-screen devices (such as mobile phones) have limited display content. Flexible screens, through folding designs, can provide a large-screen experience when unfolded and maintain portability when folded, as seen in foldable phones like the Samsung Galaxy Fold.
Extending Human Vision: According to media theorist Marshall McLuhan, media is an extension of man. Flexible screens will act like new glasses, displaying information in scenarios we never imagined, such as smart wearables and smart home interfaces.
The Current Status and Challenges of Flexible Screens
Although flexible screen technology has a foundation for application, it still faces challenges related to cost and yield:
Cost Structure: The cost of flexible screens is mainly concentrated in the module stage, especially FPC (Flexible Printed Circuit Board) and IC drivers, accounting for about 70% of the total cost. While the costs of Array and OLED, which are directly related to light emission, are high, the cost per screen is not exorbitant.
Yield Issues: The low yield rate of mass production of AMOLED flexible screens for mobile phones is mainly due to IC drivers and circuit design in the module stage. For example, a research and development colleague from a major manufacturer revealed that more than half of the low yield rate is due to module design defects.
Integration and Adaptation: Flexible screens need to be adapted to other components (such as batteries and circuit boards), while traditional smartphones use a "building block" design, requiring other components to change shape over time to match the flexible screen. This results in high costs and low yield rates for flexible screen phones at present.
Future Prospects of Flexible Screens
The development of flexible screens follows the S-curve of technology:
Technological Breakthrough Phase: Flexible screen technology has achieved fundamental breakthroughs, but application scenarios and integration forms are still unclear. For example, just as the inventor of plastic did not foresee its application in film, flexible screens may also create unexpected use cases.
Commercial Expansion Phase: As the technology matures, flexible screens may, like smartphones, achieve the functions of other media through integration forms (such as folding and rolling), thereby creating new market demands. For example, in the future, flexible screens may be integrated into clothing, glasses, and even the skin, becoming ubiquitous information interfaces.
Market Saturation Phase: Once flexible screens become widespread, innovation may slow down, and manufacturers will compete on details (such as durability and display effects). However, before that, flexible screens are expected to completely change the form and application scenarios of screens, just as plastic replaced glass.
Summary
Flexible screens are screens based on OLED technology and using flexible plastic as a substrate. Their bendable, foldable, and transparent characteristics make them a new medium for extending human vision. Despite current challenges in cost and yield, flexible screens are expected to generate disruptive applications in smartphones, smart wearables, smart homes, and other fields as the technology matures and integration improves, redefining the way information is displayed and interacted with.
