Content last revised on January 29, 2026
Sharp LQ057Q3DC02: 5.7-inch QVGA TFT-LCD for Industrial HMIs
The Sharp LQ057Q3DC02 is a 5.7-inch a-Si TFT-LCD module engineered for robust performance in demanding industrial and commercial applications. Delivering clear, consistent visuals through its combination of high brightness and a wide operating temperature range, it provides a reliable display solution for human-machine interfaces (HMIs), process controllers, and instrumentation. Its core value lies in its durability and stable optical performance, ensuring readability and operational longevity. With a 320x240 QVGA resolution and 350 cd/m² brightness, the LQ057Q3DC02 is built for environments where consistent, long-term display performance is a primary design requirement.
Key Parameter Overview
Decoding the Specs for Operational Reliability
The technical specifications of the Sharp LQ057Q3DC02 are tailored for integration into systems where durability and consistent visual output are critical. The combination of its thermal resilience and optical characteristics makes it a suitable candidate for a variety of embedded display applications.
| Parameter | Value | Engineering Significance |
| Panel Size | 5.7 inch | Provides a compact yet readable screen area for data and control interfaces. |
| Resolution | 320(RGB)×240 [QVGA] | Offers sufficient pixel density for clear graphical user interfaces and text in typical industrial control systems. |
| Brightness | 350 cd/m² (Typ.) | Ensures good visibility in typical indoor industrial and commercial lighting conditions. |
| Contrast Ratio | 60:1 (Min.) | Delivers clear differentiation between light and dark elements on screen. |
| Operating Temperature | -10 ~ 70 °C | A key feature highlighting its suitability for unconditioned environments like factory floors or enclosed kiosks. |
| Backlight System | 1 pcs CCFL, 50K hours (Typ.) | The Cold Cathode Fluorescent Lamp backlight is specified for a long operational life, reducing the need for maintenance. |
| Signal Interface | Parallel RGB (1 ch, 6-bit) | A standard interface that simplifies integration with a wide range of microcontrollers and display drivers. |
Download the LQ057Q3DC02 datasheet for detailed specifications and performance curves.
Application Scenarios & Value
System-Level Benefits in Industrial Control and Instrumentation
The LQ057Q3DC02 is best suited for applications where operational reliability over a long lifecycle is more critical than cutting-edge resolution or color depth. Its robust design addresses the common engineering challenge of specifying a display for environments with fluctuating temperatures and demanding duty cycles.
A prime application is in industrial HMI panels for manufacturing lines or process control systems. In these settings, a display must remain clearly legible and fully functional whether the facility is in a cold startup phase or running at peak thermal load. The LQ057Q3DC02's wide operating temperature range of -10°C to 70°C directly solves this problem, eliminating the need for complex and costly environmental control systems within the enclosure. The 350 cd/m² brightness ensures that status indicators, alarms, and control menus are easily readable under typical factory floor lighting. The display's specified 50,000-hour backlight lifetime supports the goal of creating low-maintenance, long-service-life equipment. For systems requiring a similar form factor but with higher resolution for more detailed graphics, the G057VN01 V2 offers VGA resolution.
Frequently Asked Questions (FAQ)
What is the primary benefit of the -10 to 70°C operating temperature range?
This wide temperature range allows the LQ057Q3DC02 to be deployed in environments without climate control, such as factory floors, outdoor-housed equipment, or transportation systems, ensuring reliable operation during both cold starts and sustained high-heat conditions.
How does the CCFL backlight's 50,000-hour lifetime impact system design?
This long operational life is a critical factor for total cost of ownership. It means the backlight is engineered to last for over 5.7 years of continuous 24/7 operation, minimizing downtime and maintenance costs associated with backlight replacement in long-life industrial equipment.
Is an external inverter required for the backlight?
Yes, the datasheet specifies that the CCFL backlight requires an external DC/AC inverter, which is not built into the module. This is a key consideration for system integrators who must account for the additional component and its power supply in their design.
What does the 6-bit Parallel RGB interface imply for development?
A 6-bit parallel interface is a straightforward, widely supported standard for embedded systems. It allows for direct connection to many common microcontrollers and FPGAs, simplifying hardware design and software driver development. It supports up to 262,144 colors, which is sufficient for the graphical needs of most industrial HMIs.
Industry Insights & Strategic Advantage
Meeting the Demand for Durability in Established Industrial Systems
In an industry landscape increasingly focused on high-resolution, multi-touch displays, the Sharp LQ057Q3DC02 maintains its relevance by serving a critical niche: the market for durable, long-lifecycle components for established industrial infrastructure. Many industrial control systems, medical diagnostic tools, and test and measurement devices are designed with service lives exceeding a decade. For these applications, component reliability and backwards-compatibility often outweigh the appeal of the latest consumer-grade display technologies.
The LQ057Q3DC02's feature set aligns perfectly with this strategic need. Its robust temperature range and long-life CCFL backlight provide the longevity and resilience required to minimize total cost of ownership. As OEMs continue to support and maintain extensive installed bases of equipment, the demand for reliable, form-fit-function replacement displays remains strong. The LQ057Q3DC02 provides a stable solution that avoids costly redesigns and re-qualifications, offering a strategic advantage for system longevity and serviceability.
Technical Deep Dive
Analyzing the Impact of Optical and Mechanical Design Choices
The performance of the Sharp LQ057Q3DC02 is a direct result of specific design choices in its optical and mechanical construction. The use of a TN (Twisted Nematic) panel is a key factor in its specification. While modern IPS panels offer wider viewing angles, TN technology provides a cost-effective solution with faster response times, which is perfectly adequate for the graphical user interfaces found in many industrial controllers where rapid video playback is not a primary requirement. The specified response time of 30/50 ms (Tr/Td) is sufficient to prevent noticeable ghosting for typical HMI animations and status changes.
Mechanically, the module's outline of 144 x 104.6 x 12.4 mm defines a standard footprint for 5.7-inch displays, facilitating its use as both a new component and a drop-in replacement in existing designs. The surface treatment, featuring a hard coating (3H) and an anti-reflection layer, is a critical feature for industrial usability. The hard coating provides essential protection against scratches from styluses or accidental contact in a busy environment. The anti-reflection layer improves screen readability by diffusing ambient light, reducing glare from overhead factory lighting—a simple but crucial feature for reducing operator eye strain and improving accuracy.
From an integration standpoint, the choice of a standard 33-pin connector for the parallel RGB signals simplifies the physical connection to the main controller board. This adherence to established interface standards is a significant benefit for engineers, as it reduces design complexity and leverages existing, well-understood technologies. This design philosophy prioritizes reliability and ease of integration over novel but potentially more complex interface protocols.
A Strategic Choice for Long-Term System Support
For engineering and procurement teams tasked with maintaining the operational readiness of long-deployed industrial systems, the LQ057Q3DC02 represents a component choice rooted in practicality and long-term value. Its proven technology, robust environmental specifications, and adherence to standard interfaces ensure it can be integrated with minimal system disruption, providing a dependable solution that supports the extended lifecycles common in the industrial sector.
