Category: Embedded Systems

Embedded systems represent one of the most dynamic fields in modern electronics and computing. They are purpose-built computing units designed to perform specific tasks with precision, speed, and reliability. From industrial automation and energy control to smart appliances and automotive electronics, embedded systems enable real-time decision-making and seamless communication between hardware and software components.

Unlike traditional computers, an embedded system is optimized for efficiency rather than general versatility. It combines a compact hardware platform — often based on ARM or RISC architectures — with an operating system such as Linux, Android, or a lightweight real-time OS. This integration allows devices to execute deterministic functions with minimal latency, making them indispensable in safety-critical and time-sensitive environments.

Across industries, embedded systems power the invisible intelligence behind countless applications. They regulate temperature and energy in factories, manage lighting and HVAC in smart buildings, control engines in vehicles, and enable remote monitoring in healthcare and logistics. With the rise of the Internet of Things (IoT), these systems are evolving into connected nodes that exchange data across vast networks, creating a foundation for automation and digital transformation.

The design of an embedded system involves careful coordination between hardware and software. Engineers must balance computational performance, memory constraints, and power consumption while ensuring long-term reliability and serviceability. Advances in SoC (System-on-Chip) technology have made it possible to integrate high-performance CPUs, GPUs, and AI accelerators into small-form-factor boards, enabling edge computing and intelligent data processing directly within the device.

Developers typically rely on open-source toolchains, board support packages (BSPs), and cross-compilers to build custom firmware. Popular single-board computers such as Rockchip- and Allwinner-based platforms have expanded accessibility to industrial-grade embedded computing. Combined with high-resolution TFT displays and capacitive touch panels, these solutions provide intuitive interfaces for both consumer and industrial applications.

As embedded technologies continue to advance, their role in automation, connectivity, and human-machine interaction grows even more significant. The convergence of AI inference, secure communication protocols, and energy-efficient hardware is transforming how devices operate in the field. Whether in manufacturing plants, transportation hubs, or smart homes, embedded systems are redefining how data and intelligence are distributed across networks.

This page explores the evolution of embedded systems, their architecture, and practical applications in today’s connected world. Readers will find discussions on embedded Linux and Android platforms, hardware-software co-design, and the challenges of developing reliable, scalable systems. Through continuous innovation, embedded computing is shaping the next generation of intelligent devices that power modern life.

The Evolution of KNX: How Visual Wall Panels Are Transforming Modern Building Automation

Embedded Systems

For many years, KNX has been regarded as one of the most stable and future-ready automation standards
for homes, commercial complexes, and industrial buildings. Its foundation has always been built on a
network of sensors, actuators, control modules, and dedicated servers working together to manage
lighting, HVAC, shading, energy, and security systems. While this core architecture remains unchanged,
the way users interact with these systems is undergoing a noticeable shift.

A new category of devices—visual wall-embedded control panels—is rapidly changing the user interface
experience. These panels combine touch-based control with rich visualization and modern UI design,
bringing a level of clarity and convenience that traditional pushbuttons and mobile apps cannot fully
match. Positioned permanently on the wall, always ready, and designed for quick access, they are
becoming the preferred human-machine interface for KNX-powered smart homes and smart buildings.

knx-panel

Why Visual Panels Are Becoming Central in KNX Systems

For decades, the primary interaction method in KNX installations was the conventional pushbutton
switch. These devices are reliable and long-lasting, but as modern buildings grow more complex—
featuring multi-zone climate systems, dynamic lighting scenes, detailed energy monitoring, and
integrated security—pushbuttons simply cannot express that level of information.

This gap is filled by the new generation of visual control panels. They offer:

  • Touch-based control for lighting scenes, HVAC modes, and shading systems
  • Graphical widgets showing real-time temperature, humidity, energy usage, or air quality
  • Multi-page navigation for different rooms and system categories
  • Customizable layouts that blend into interior design
  • Instant feedback that improves both usability and energy awareness

These advantages make visual panels more than a stylistic upgrade—they provide a level of interaction
that aligns with how users expect smart buildings to behave.

Technologies Powering the New KNX Visual Panels

Modern visualization panels are built on far more capable hardware than earlier KNX displays. Today’s
devices incorporate higher-speed processors, sharper IPS or TFT LCD screens, and responsive capacitive
touch sensors. This gives manufacturers room to implement fluid animations, advanced dashboards, and
fast UI interactions.

1. High-Performance Embedded Hardware

Current KNX panels often include:

  • ARM-based processors (Cortex-A or Cortex-M families)
  • High-resolution IPS displays
  • Multi-touch capacitive sensors
  • Edge-to-edge glass or thin-bezel construction
  • Improved environmental resistance for wall installation

These upgrades result in smooth animations, clearer graphics, and responsive controls that were not
possible in earlier KNX devices.

2. Direct KNX TP or KNX IP Integration

Modern visualization panels communicate directly via KNX TP or KNX IP, eliminating the need for
additional gateways. Using ETS, installers can configure communication objects, assign group
addresses, and tailor user scenes exactly as they would with standard KNX sensors.

3. Modern Visualization Frameworks

To build attractive interfaces, many panels now rely on UI engines such as Qt, Flutter, or proprietary
graphics frameworks. These tools make it possible to design:

  • Room-based dashboards
  • Lighting and HVAC control pages
  • Energy and environmental charts
  • Camera and security monitoring screens

The end result is closer to a premium mobile interface than a traditional automation controller.

Key Functions of Today’s KNX Visual Wall Panels

Although every manufacturer approaches the design slightly differently, most modern KNX visualization
panels offer a similar set of core features.

  • Centralized multi-room control: One device can manage lighting, shading, climate, scenes, and often multimedia.
  • Real-time feedback: Users can monitor temperature, humidity, air quality, or energy consumption instantly.
  • Built-in sensors: Presence, brightness, or temperature sensors enhance automation logic.
  • Personalization: Room names, icons, scenes, and brightness levels can be customized.
  • Energy-efficient standby modes: Screens dim automatically or wake on proximity.

How Visual Panels Compare to Traditional KNX Pushbuttons

Feature Pushbutton Sensors Visual Wall Panels
Control Type Physical press Touchscreen UI with multiple pages
Feedback LED indicators Full graphical feedback
Complexity Handling Limited Ideal for multi-zone and advanced scenes
Aesthetics Minimal Modern, customizable

In high-end installations, both device types are used together: pushbuttons for quick actions, visual
panels for detailed control.

Where KNX Visualization Panels Are Being Used

  • Premium residences with multi-room automation
  • Hotels seeking intuitive guest room control
  • Office buildings with scheduling and environmental dashboards
  • Hospitals and healthcare facilities
  • Retail spaces optimizing lighting and ambience

The Future of KNX User Interfaces

As KNX expands worldwide, the role of user-centric interfaces will only grow. Manufacturers are
already exploring voice-enabled control, AI-assisted climate regulation, and predictive monitoring
dashboards. At the same time, improvements in processing power and display technology will continue to
push wall-embedded panels toward even higher visual quality and functionality.

What is clear is that visual panels represent the most significant evolution in KNX user experience in
years. They make automation more intuitive, more attractive, and far easier for homeowners and
building operators to understand.

Conclusion

The arrival of modern KNX visualization panels marks a major shift in how people interact with smart
buildings. Moving beyond traditional pushbuttons, these panels provide multi-layered visualization,
smooth navigation, and real-time feedback—delivering a richer, more engaging experience. As the
technology matures, visual wall panels will continue to move toward the center of KNX installations,
offering both functionality and elegance in equal measure.

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STM32V8: STMicroelectronics Introduces a Breakthrough 18nm High-Performance Cortex-M85 MCU

Embedded Systems

STMicroelectronics has officially unveiled its next-generation embedded processing platform, the
STM32V8 series—a groundbreaking line of microcontrollers built on an advanced
18nm process node and powered by the Arm Cortex-M85 core.
This new product family marks one of the biggest technological leaps in the STM32 ecosystem since
the introduction of the STM32H7, pushing microcontroller performance to levels previously achievable
only with application processors.

stm32v8-mcu

With the combination of ultra-fine geometry, industry-leading performance efficiency, and
state-of-the-art security features, the STM32V8 series is designed to meet the growing demand for
real-time computing in edge AI, industrial automation, robotics, automotive subsystems,
and advanced consumer electronics.

What Makes STM32V8 a Breakthrough?

Microcontroller technology has traditionally been limited by larger-node semiconductor processes,
typically ranging from 40nm to 90nm. Transitioning to an 18nm process is a major milestone for the
MCU industry, as it dramatically increases transistor density, reduces leakage current, and delivers
a substantial boost in power efficiency.

Here are the core innovations behind STM32V8:

  • 18nm FD-SOI process technology enabling better speed-power balance
  • Cortex-M85 core delivering performance rivaling some Cortex-A chips
  • New generation DSP and AI accelerator extensions
  • Advanced TrustZone-enabled security for industrial and IoT applications
  • Optimized memory subsystem with ultra-fast cache and tightly-coupled memory
  • Next-gen connectivity: Ethernet TSN, high-speed USB, CAN FD, and more

In terms of real-world capability, STM32V8 pushes the STM32 family into performance categories
once considered impossible for an M-class microcontroller.

18nm Process Node: Why It Matters

One of the most notable highlights of STM32V8 is its fabrication using a cutting-edge
18nm process node. This represents a huge reduction compared with ST’s earlier
MCUs based on 40nm or 90nm manufacturing. The benefits are substantial:

  • Higher transistor density: allows more complex peripheral integration
  • Lower dynamic and leakage power: extends operation in battery-powered systems
  • Higher clock speeds: enables near-GHz-class computing in MCU environments
  • Improved analog performance: precision-critical systems benefit from lower noise

Compared with STM32H7 (built on 40nm), STM32V8 can deliver better performance per watt while operating
at significantly higher frequencies. This makes it ideal for compute-intensive tasks traditionally
handled by low-end application processors.

Cortex-M85: The Most Powerful M-Class Core

At the heart of the STM32V8 is the Arm Cortex-M85, Arm’s highest-performance
microcontroller-oriented core. It incorporates the new Arm Helium vector extension,
dramatically improving signal processing and AI capabilities.

Key Cortex-M85 Enhancements

  • Up to 6x better DSP performance compared to Cortex-M7
  • 3x improvement in machine-learning throughput
  • Enhanced FPU with more efficient floating-point operations
  • Tighter real-time determinism for industrial systems
  • High secure state separation via TrustZone-M

The result is an MCU capable of performing advanced AI inference, high-speed filtering, sensor fusion,
motor control loops, and predictive maintenance algorithms—all while retaining the low power and
deterministic behavior of an M-class device.

Next-Generation Memory Architecture

STM32V8 introduces a redesigned memory subsystem that reduces latency and maximizes instruction throughput.
Built on the advantages of the 18nm geometry, the architecture features:

  • High-bandwidth instruction cache
  • Tightly-coupled memory for real-time critical functions
  • Large on-chip SRAM for compute-heavy workloads
  • Fast non-volatile memory enabling rapid boot times

This enables the MCU to sustain high processing frequencies without the bottlenecks typically found
in traditional embedded architectures.

Advanced Security: Designed for Industrial and IoT Trust

As security becomes an increasingly important component of edge computing, STM32V8 incorporates a
full suite of hardware-level protections:

  • Arm TrustZone-M with isolated secure world
  • Secure boot and secure firmware update
  • Cryptographic accelerators (AES, SHA, ECC)
  • Secure key storage and tamper detection
  • High-reliability memory protection units

These capabilities make STM32V8 suitable for applications involving safety, payment, medical systems,
and critical IoT devices.

Connectivity Built for Modern Industrial Systems

The STM32V8 family integrates a rich set of modern industrial-grade peripherals, enabling high-bandwidth
communication and deterministic control:

  • Ethernet with TSN (Time-Sensitive Networking)
  • High-Speed USB
  • CAN FD for automotive and robotics
  • SPI/QSPI/OSPI for external memory expansion
  • Advanced ADC/DAC with low noise

These features allow the MCU to seamlessly integrate into factories, automotive ECUs, and IoT gateways.

How STM32V8 Compares to Previous Generations

Feature STM32H7 STM32V8
Process Node 40nm 18nm
Core Cortex-M7 Cortex-M85
AI / DSP Capability Moderate Very high (Helium + advanced FPU)
Security Basic TrustZone Extended, with full hardware isolation
Power Efficiency Good Excellent due to 18nm
Target Applications High-end MCU tasks AI, advanced industrial, robotics

Key Application Areas for STM32V8

1. Industrial Automation

With TSN Ethernet, real-time deterministic performance, and advanced motor-control capabilities,
STM32V8 is ideal for PLCs, servo drives, robotic controllers, industrial sensors, and factory gateways.

2. Edge AI and Machine Learning

Thanks to the Cortex-M85 Helium vector extension, the MCU can run:

  • AI inference models
  • Sensor fusion algorithms
  • Predictive maintenance logic
  • High-speed anomaly detection

3. Automotive Embedded Systems

The combination of CAN FD, improved safety features, and deterministic processing makes it suitable for:

  • ADAS support modules
  • Body control systems
  • Vehicle gateways
  • Real-time safety monitoring

4. Smart Consumer Electronics

Devices requiring high responsiveness and enriched UI—such as smart appliances, entertainment systems,
and interactive interfaces—benefit from the MCU’s strong compute capability and low power operation.

5. Medical and Healthcare Devices

The MCU’s precision ADCs, strong security, and real-time reliability suit medical monitors,
diagnostic platforms, biosignal processing devices, and portable lab equipment.

Why STM32V8 Matters for the Future of Embedded Systems

The introduction of the STM32V8 marks a shift in the MCU industry. It brings microcontrollers closer to the
performance domain once reserved for entry-level application processors, while preserving the low power,
deterministic behavior, and ecosystem advantages of the STM32 platform.

For developers, it means:

  • Running significantly more complex algorithms on MCU hardware
  • Reducing the need for separate AI accelerators or co-processors
  • Lower BOM cost for high-performance systems
  • Long-term migration path with high backward compatibility

For companies, STM32V8 represents an opportunity to build smarter, more power-efficient,
and cost-optimized products across a wide range of markets.

Conclusion

With its 18nm process technology, Arm Cortex-M85 core, advanced security, and rich connectivity features,
the STM32V8 marks a major evolution in the MCU landscape.
STMicroelectronics is positioning the V-series as the next major performance tier in the STM32 roadmap,
capable of supporting the next generation of industrial automation, AI-enabled devices, robotics,
and advanced embedded systems.

As developers explore the capabilities of STM32V8, it is clear that this new family will enable
a wave of innovation at the edge—where real-time performance, energy efficiency, and intelligent processing
are more important than ever.

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Outdoor Readability: Optical Bonding for Industrial Applications

Embedded Systems, IPS Screen, TFT-LCD Displays

When designing displays for outdoor or semi-outdoor environments, one of the biggest challenges engineers face is ensuring visibility under bright ambient light.
The human eye perceives contrast — not brightness — so even a 1500-nit screen can appear washed out if strong sunlight causes glare and internal reflections.
This is where optical bonding becomes a game-changer.
It not only improves readability but also enhances mechanical durability and environmental resistance, which are critical for industrial applications.

Optical-bonding DIsplay

Understanding the Challenge of Outdoor Readability

In a typical TFT LCD module, there are multiple layers — LCD cell, air gap, touch panel, and cover glass.
Each air-glass interface reflects a portion of incoming light, usually around 4% per surface.
In outdoor lighting conditions where sunlight can exceed 100,000 lux, these reflections add up, creating glare that significantly reduces contrast.
As a result, even high-brightness backlights struggle to overcome ambient reflections.

For example, a 1000-nit LCD in direct sunlight may deliver an effective contrast ratio below 3:1 — far below the recommended minimum of 10:1 for human visual comfort.
Engineers can increase the backlight power, but that introduces heat, shortens LED lifespan, and consumes more energy — not ideal for battery-powered or compact devices.

In addition to optical bonding, many engineers also choose advanced panel technologies like IPS, which naturally offer better viewing angles and stable color reproduction under sunlight.When combined with bonding techniques, industrial IPS display solutions deliver superior outdoor readability and visual consistency across wide temperatures and angles.
IPS technology provides superior viewing angles, stable color reproduction, and better light transmission compared with TN or VA panels — making it a strong foundation when combined with optical bonding for outdoor industrial use.

What Is Optical Bonding?

Optical bonding is the process of using a transparent adhesive material to eliminate the air gap between the LCD surface and the cover glass or touch panel.
The adhesive — typically a silicone gel or optically clear resin (OCR) — matches the refractive index of glass, minimizing internal reflection.
By filling the gap, it allows light to pass through with less scattering, improving both contrast and sharpness.

There are two common optical bonding methods:

  • Full optical bonding — The adhesive fills the entire gap between the display and cover glass, achieving maximum optical and structural benefits.
  • Edge bonding — Adhesive is applied only along the border to reduce cost and simplify rework, but optical performance is less effective.

How Optical Bonding Improves Readability

The most direct benefit of optical bonding is the significant reduction of internal reflection.
By removing the air interface, the reflectance between the LCD and glass drops from approximately 8% to less than 1%.
This directly improves contrast ratio and color saturation under bright conditions.

1. Reduced Reflection

Without bonding, incident light reflects between multiple surfaces inside the module.
These reflections not only reduce contrast but also create a “double image” effect — the mirror-like reflection of external objects on the glass surface.
Optical bonding eliminates these reflections, resulting in crisp visuals even under direct sunlight.

2. Enhanced Contrast Ratio

The perceived contrast ratio can improve by 200–400% depending on ambient conditions.
Users experience deeper blacks, more accurate colors, and improved legibility of fine text.
In industrial or outdoor environments where quick visual recognition is critical — such as dashboards, marine control panels, or medical devices — this improvement directly enhances usability.

3. Improved Durability and Shock Resistance

Because the cover glass is firmly attached to the LCD module, optical bonding strengthens the entire structure.
It prevents dust or moisture from entering the gap and provides additional mechanical protection against vibration and shock.
For ruggedized industrial displays, this added robustness is just as valuable as improved optics.

4. Wider Operating Temperature and Environmental Resistance

Air gaps can cause condensation or fogging when temperature fluctuates rapidly — a common scenario in outdoor installations.
The bonding adhesive eliminates this void, effectively preventing fogging and maintaining clear visibility across a wider temperature range.

Optical Bonding vs. Air Gap: A Practical Comparison

Let’s compare a standard air-gap LCD with an optically bonded version under sunlight:

Parameter Air-Gap LCD Optically Bonded LCD
Internal Reflection ≈ 8% < 1%
Contrast Ratio (Outdoor) 3:1 – 5:1 10:1 – 15:1
Readability Under Sunlight Poor to Fair Good to Excellent
Condensation Risk High (due to air gap) None
Mechanical Strength Moderate High

These quantitative improvements translate into real-world advantages — not only better visibility but also longer lifespan and reduced field maintenance.

Industrial Applications of Optical Bonding

Optical bonding has become a standard for industrial displays used in demanding environments where clarity and reliability are mission-critical.
Some common use cases include:

  • Outdoor kiosks and ticketing machines — Readability under sunlight ensures users can operate the interface without frustration.
  • Marine and vehicle displays — Reduced reflection helps operators see clearly even under glare from the sea or windshield.
  • Medical equipment — Eliminates fogging in high-humidity operating rooms and improves hygiene by sealing the surface.
  • Industrial automation panels — Enhanced durability and touch accuracy improve long-term reliability.

As the trend toward digital control and data visualization continues, more sectors — from logistics terminals to agriculture — are adopting bonded displays for their superior performance.

Optical Bonding Materials and Methods

The effectiveness of optical bonding largely depends on the adhesive material and process control.
The two most common materials are:

  • Optically Clear Adhesive (OCA) — A pressure-sensitive adhesive film used mainly for small to medium displays. Offers excellent clarity and easy reworkability.
  • Optically Clear Resin (OCR) — A liquid material that cures under UV light, ideal for large panels or complex shapes. Provides superior adhesion and environmental stability.

Key process parameters include degassing, alignment precision, UV curing time, and cleanliness of the bonding environment.
Even tiny air bubbles or dust particles can compromise optical quality, so many manufacturers perform bonding in Class 1000 clean rooms.

When Should You Choose Optical Bonding?

While optical bonding adds cost compared to traditional lamination, the performance benefits often justify the investment.
Consider optical bonding if your application involves:

  • Outdoor or semi-outdoor installation (sunlight exposure)
  • Wide temperature and humidity variations
  • High vibration or mechanical shock
  • Touch interaction with thick cover glass
  • High-brightness backlight (≥ 800 nits)

For mission-critical or high-end products, the combination of visibility, durability, and reliability makes optical bonding an indispensable part of the display design.

Future Trends: Anti-Reflection and Hybrid Bonding Technologies

The next evolution of optical bonding integrates multiple technologies for even better optical performance.
Anti-reflective (AR) coatings on cover glass further reduce surface reflection to below 0.5%, while anti-fingerprint (AF) coatings improve surface cleanliness.
Some manufacturers are also exploring hybrid bonding — combining OCA for optical layers and structural adhesive for reinforcement — to achieve both reworkability and strength.

Another promising development is vacuum bonding for large-format industrial displays, which ensures uniform adhesive distribution and eliminates micro-bubbles even on panels above 15 inches.

round display

Conclusion

In environments where sunlight, temperature fluctuations, and mechanical stress are everyday realities, optical bonding transforms a standard display into a reliable industrial-grade solution.
It enhances readability, durability, and user experience — all while protecting the display from the harsh elements of outdoor use.

For industries ranging from transportation to medical imaging and factory automation, investing in optical bonding technology means fewer maintenance issues and longer operational life.
As display performance expectations continue to rise, optical bonding will remain one of the most effective and proven ways to ensure outdoor readability and reliability.

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LCD vs OLED: Choosing the Right Display for Embedded Systems

Embedded Systems, TFT-LCD Displays

In the fast-evolving world of embedded systems and consumer devices, the discussion of LCD vs OLED has become one of the most important technology debates. Developers and product designers are constantly weighing the trade-offs: should they choose the proven reliability and lower cost of LCD, or go for the stunning image quality and modern appeal of OLED? Understanding these differences is essential for making the right decision in both consumer electronics and embedded applications.

This article explores how both display technologies work, their advantages, their trade-offs, and how to make the right choice for your specific application.
LCD-Vs-OLED

1. Basic Working Principles

  • LCD (Liquid Crystal Display): Relies on a backlight that shines through a liquid crystal layer. The crystals modulate light to create colors and images.
  • OLED (Organic Light Emitting Diode): Each pixel emits its own light, removing the need for a backlight.

This fundamental difference drives most of the real-world performance gaps between the two technologies.

2. Visual Quality: Contrast and Blacks

OLED panels excel in contrast. Since pixels can switch off individually, dark scenes look truly black, not just dark gray. This results in breathtaking contrast and depth.

  • OLED: Deep blacks, infinite contrast, wide viewing angles.
  • LCD: Good brightness, but sometimes suffers from washed-out shadows.

However, modern LCDs using IPS or local dimming can narrow this gap significantly.

3. Color Accuracy

OLED displays often deliver richer colors and wider gamuts, but LCD panels enhanced with quantum dots also provide highly accurate color reproduction.

  • OLED: High saturation, deeper reds and blues, consistent performance across angles.
  • LCD: Easier to calibrate, more neutral color tones, stable in bright environments.

4. Viewing Angles and Clarity

One area where OLED has a decisive lead is viewing angle consistency. From any perspective, image quality remains intact. LCDs, by contrast, may exhibit some backlight bleed and reduced clarity at oblique angles.

5. Durability and Longevity

When used in embedded applications, longevity is critical:

  • OLED: Prone to burn-in and pixel degradation over time, especially with static content.
  • LCD: More reliable in continuous-use scenarios such as industrial automation or kiosks.

6. Energy Efficiency

The energy profile differs depending on content:

  • OLED: Very efficient with dark themes but consumes more when displaying bright, white-heavy content.
  • LCD: Power draw is more consistent, as the backlight remains active regardless of displayed image.

7. Cost and Availability

LCD panels are generally cheaper and easier to source, making them an attractive option for cost-sensitive projects. OLED panels are more expensive due to complex manufacturing and lower yields, though prices are gradually falling.

8. Choosing the Right Technology

Scenario Best Choice
High-contrast media applications OLED
Industrial 24/7 operation LCD
Budget-limited hardware design LCD
Premium consumer products OLED

Conclusion

Neither LCD nor OLED is universally “better”—it depends on the product’s use case. OLED offers unmatched visuals for premium or multimedia-driven applications, while LCD delivers robustness and affordability, especially valuable for industrial and embedded systems.

To dive deeper into how embedded displays are applied in real-world products, more technical resources are available at
LCD entry on Rocktech.
For a neutral overview of display technology history, check the
LCD entry on Wikipedia.

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