InnoComm Develops a Next-Generation Sunlight-Readable Reader with a High-Refresh-Rate Display

Next-generation reading devices are no longer limited to displaying static text. As digital reading expands to real-time note-taking, document annotation, page scrolling, and web browsing, devices must preserve the comfortable, paper-like reading experience while delivering faster screen updates and more responsive interaction.

InnoComm helped its customer develop a 10.5-inch sunlight-readable device by integrating advanced reflective display technology with the MediaTek MT8781 (Helio G99) computing platform. The display supports refresh rates of up to 120 fps and can automatically switch between 24 and 120 fps based on different usage scenarios, including reading, handwriting, page scrolling, and dynamic content.

Compared with conventional e-paper readers designed primarily for static content, the device provides smoother page turns, scrolling, handwriting, and document interaction while maintaining outdoor readability, controlled system power consumption, and extended battery life.

The key challenge was not simply increasing the display refresh rate. It was integrating a non-standard display module, touch interface, and stylus input with an existing computing platform while ensuring stable operation across the entire system. From display drivers and graphics rendering to input latency and power management, InnoComm helped the customer address the integration challenges involved in turning a specialized display technology into a production-ready product.

Moving Beyond Static Reading to Fluid Interaction

Traditional electrophoretic e-paper offers low power consumption and strong sunlight readability when displaying static content such as books and documents. However, when users need to turn pages quickly, scroll through content, zoom in on documents, or write in real time, slower screen updates can result in latency, ghosting, or visible flickering.

The customer wanted to develop a new generation of reading devices that would combine a paper-like reading experience with the responsiveness of a modern digital device. In addition to long-form reading, the product needed to support real-time note-taking, document annotation, web browsing, and other operations involving frequent screen updates.

To achieve this, the product uses a customized high-refresh-rate reflective display solution. While retaining sunlight readability and low-glare characteristics, the display supports refresh rates of up to 120 fps.

The system does not operate continuously at its maximum refresh rate. Instead, it automatically switches between 24 and 120 fps. When the user is reading static text, the system can use a lower refresh rate to reduce unnecessary processing and power consumption. During fast scrolling, document zooming, handwriting, or dynamic content playback, it can increase the refresh rate to provide more immediate and continuous visual feedback.

Although the display can technically operate at refresh rates as low as 1 fps, such a low frequency can cause noticeable interruptions and negatively affect the overall user experience. After evaluating the balance between power consumption and usability, InnoComm and the customer selected 24 fps as the minimum refresh rate for practical use.

This dynamic refresh-rate mechanism allows the reading device to move beyond static content. Users can scroll through pages, zoom in on documents, write notes, and interact with applications more naturally, extending the paper-like display experience to learning, content creation, and mobile productivity.

System Integration Challenges Behind a High Refresh Rate

Achieving up to 120 fps requires more than upgrading the display panel. As the refresh rate increases, graphics rendering, memory access, and display data transmission workloads also rise.

During every screen update, the system must complete application processing, screen composition, GPU rendering, and display output. If any part of this process cannot keep up, the result may be dropped frames, latency, or inconsistent visual performance.

In addition, specialized reflective display modules have different driving requirements and visual characteristics from conventional displays. Existing mobile computing platforms typically do not provide complete native support. InnoComm therefore had to review and optimize the entire data path, from the moment an application generates an image to the point at which the content appears on the screen.

The primary integration work included:

Specialized display interface and signal-timing integration
Display driver and low-level software tuning
Dynamic refresh-rate switching between 24 and 120 fps
GPU rendering and screen-update optimization
Memory bandwidth and data-transfer optimization
Touch and stylus input integration
Display module and system-level power management
Display performance validation under different lighting conditions
Long-duration operation and system stability testing

InnoComm's role extended beyond establishing a hardware connection between the display and processor. It involved end-to-end integration covering low-level software, system resource allocation, and the final user experience.

Making Real-Time Handwriting Feel Truly Responsive

For a next-generation reading device, handwriting is not simply an additional feature. It is a fundamental part of the reading, note-taking, and content creation experience.

From the moment the stylus touches the screen, the system must process coordinate detection, touch events, application calculations, stroke rendering, and screen updates. Latency at any point in this processing chain can cause the displayed stroke to fall behind the user's hand movement.

Even when a display supports a high refresh rate, the actual handwriting experience may still feel unnatural if touch sampling, software processing, and screen updates are not properly synchronized.

InnoComm therefore incorporated touch input, stylus input, graphics rendering, and display updates into a unified system-tuning process. This improved coordination between input events, graphics rendering, and visual feedback. When the system detects handwriting or document annotation, it can automatically increase the refresh rate, allowing strokes to appear on the screen more quickly.

Through this integration, the maximum 120 fps refresh rate becomes more than a specification. It translates into a smoother and more responsive handwriting experience based on actual operating requirements.

Supporting Display and Computing Requirements with MediaTek MT8781

The product is powered by the MediaTek MT8781 (Helio G99) system-on-chip. Its 6 nm process and octa-core CPU architecture balance application processing, multitasking performance, and energy efficiency, making it suitable for a reading device that requires both high-refresh-rate display performance and extended mobile use.

The integrated GPU provides the graphics processing capability required for screen rendering, enabling the system to handle display output, touch input, applications, and multimedia content simultaneously. Combined with optimized memory and data-transfer processes, the platform maintains stable page transitions, document zooming, and handwriting performance at higher refresh rates.

However, continuously driving a high-refresh-rate display also increases processing workloads and power demand. If the system remains at its maximum refresh rate or in a high-performance mode for extended periods, device temperature may increase and battery life may be reduced.

InnoComm therefore adjusted the display refresh rate, computing resources, and power management strategy according to different scenarios, including reading, handwriting, browsing, and dynamic content. The system provides sufficient display and processing performance when immediate responsiveness is required, while reducing unnecessary workloads when presenting static content.

Through hardware and software co-optimization, the product achieves an effective balance among interaction responsiveness, power consumption, and battery life.

Validating the Reading Experience Across Different Environments

The visual performance of a reflective display is influenced by ambient lighting conditions. Completing basic display and functional tests in an indoor laboratory is therefore not sufficient to confirm that the product will meet real-world usage requirements.

InnoComm validated the display under indoor, outdoor, bright-light, and low-light conditions, examining text legibility, image stability, touch responsiveness, and system power consumption.

The validation scope included:

Screen visibility under different ambient lighting conditions
Stability of dynamic refresh-rate switching between 24 and 120 fps
Smoothness of page turning, scrolling, and document zooming
Touch and stylus input response time
Power consumption in reading, handwriting, and dynamic-content modes
System temperature and stability during extended use
Standby, wake-up, and abnormal-condition recovery
Compatibility between the display system and applications

These tests ensured that the product not only supports refresh rates of up to 120 fps on paper, but can also select an appropriate refresh rate under different environments and usage scenarios to deliver a stable and consistent reading and handwriting experience.

Turning Specialized Display Technology into a Production-Ready Product

Developing a sunlight-readable reader with a high-refresh-rate display involves much more than connecting a display to a processor. The display module, processor, GPU, memory, touch interface, stylus input, wireless connectivity, power management, and operating system must all work together reliably on a single platform.

From platform architecture assessment, specialized display interface integration, and low-level software tuning to dynamic refresh-rate control, touch and stylus integration, power optimization, and comprehensive system validation, InnoComm helped the customer overcome the engineering challenges of integrating a non-standard display technology with a mobile computing platform.

The resulting next-generation reader combines sunlight readability, refresh rates of up to 120 fps, dynamic adjustment between 24 and 120 fps, responsive handwriting, and full application support. It bridges the user-experience gap between conventional e-paper readers and general-purpose mobile devices.

This project demonstrates how InnoComm transforms a customer's specialized display requirements into a production-ready product. By preserving reading comfort while improving interactive performance, InnoComm helps customers shorten development cycles, reduce productization risks, and create a differentiated next-generation digital reading experience.