Technical Challenges in the Development of High-Resolution Camera Modules

Advanced camera capabilities are becoming the most critical differentiator for flagship smartphones, with their prominence arguably eclipsing that of the main processor platforms. Mainstream flagship smartphones have already adopted 13-megapixel sensors, 5P or even 6P lens configurations, and cutting-edge technologies such as closed-loop autofocus motors and optical image stabilization (OIS). Manufacturers may launch 16-megapixel phones by the end of this year; notably, Chinese suppliers are already capable of providing these high-end camera modules, signaling that China's camera module industry has joined the global top tier.
However, the industry has expanded rapidly in recent years to meet massive market demand, resulting in hundreds of manufacturers—dozens of which operate at a significant scale. Can the market sustain so many players in the future? Manufacturers that fail to keep pace with technological upgrades or achieve economies of scale risk being quickly eliminated. Let us first examine the key technical challenges associated with 13-megapixel modules and the upcoming 16- and 20-megapixel versions.
Key Technical Challenges for 16MP and 20MP Camera Modules
A technical executive at Sunny Optical, a leading Chinese camera module manufacturer, identified the following primary challenges:
*   Increased manufacturing complexity for components: Larger apertures make it difficult to improve lens production yields; for instance, even the best manufacturers currently achieve a yield of only 20% for f/1.8 lenses. Furthermore, as resolutions rise to 16 or 20 megapixels, 5P lens designs struggle to meet resolution requirements, necessitating the use of 6P lenses or higher. Increasing the number of lens elements poses a definite challenge for lens manufacturers regarding assembly;
*   **Increased difficulty in supply chain resource integration:** The technical complexity of components means that few suppliers can produce high-resolution components; the player who can successfully integrate these resources will dominate the market.
*   **Increased difficulty in module assembly:** Higher resolution demands greater uniformity and consistency in resolving power, which in turn raises the requirements for production lines; specifically, controlling "tilt" during the module assembly process becomes a critical factor in determining module performance.
"In summary, I believe that establishing a foothold and growing in the module industry is no longer just a matter of who has the capital to invest in COB production lines—that was the priority five years ago. Today, success depends on which module manufacturer possesses superior packaging, assembly, and testing capabilities," he observed.
Meanwhile, a technical executive from Truly—another major Chinese camera module manufacturer—offered a detailed perspective on the challenges facing the industry in the future.
He explained that if the goal is simply to increase resolution, the primary technical hurdles lie in process improvements and quality control—including the management of contaminants, optical center alignment, tilt control, calibration for color and functional consistency, and image quality uniformity. However, for products featuring closed-loop autofocus motors or optical image stabilization (OIS), the entire manufacturing process requires significant upgrades and retooling, imposing much stricter requirements on production line precision, cleanroom cleanliness, and design accuracy. Overall, the higher the resolution, the greater the manufacturing complexity for camera modules. Currently, only a few domestic camera module manufacturers have experience in mass-producing 13MP modules; the transition from 8MP to 13MP largely involves strengthening production management. However, a significant proportion of products with resolutions of 13MP or higher currently require integration with closed-loop autofocus (AF) motors and optical image stabilization (OIS) systems; thus, the adoption and mastery of these new processes and technologies pose the greatest challenge. "Truly has already successfully mass-produced closed-loop AF and OIS modules, positioning us as a leader in the domestic market," he stated proudly.
Beyond the challenges associated with these new technologies, camera module manufacturers face another new task: tracking and developing revolutionary camera technologies.
Commercial Prospects for Revolutionary Technologies like Array Cameras
This year, several innovative, revolutionary camera technologies—such as array cameras, MEMS cameras, OIS, and light-field cameras—have come into the public eye. Domestic module manufacturers are actively tracking or developing these technologies, but a common concern arises: will these emerging technologies replace traditional ones? And if so, when?
In response, the technical lead at Juhonghan Technology analyzed several of these currently trending revolutionary camera technologies. He noted that array cameras are still in the stage of industry integration; there is likely a long road ahead before they achieve full commercialization—it would be a significant achievement if they gained traction by the second half of next year. MEMS cameras are promising, offering advantages in size and power consumption over current VCM (Voice Coil Motor) solutions; however, the reliance on a single supply source is a drawback that hinders industry development (see the comparison chart below). Light-field cameras are similar to array cameras, though he personally considers their application in smartphones unlikely. OIS technology is set to become mainstream next year and will likely be the preferred configuration for flagship devices from top-tier clients. He also highlighted that various 3D camera and optical zoom solutions are currently under research; while they may appear in the market in limited numbers next year, they are unlikely to become mainstream.