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Sharp LM8V31 LCD Display

Sharp LM8V31: 8.4" 640x480 DSTN LCD. Engineered for clarity in industrial HMIs and MRO. High-contrast visibility and a reliable CCFL backlight ensure proven performance and maximum uptime.

· Categories: LCD Display
· Manufacturer: Sharp
· Price: US$
· Date Code: 2021+
. Available Qty: 188
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Whatsapp: 0086 189 2465 1869
Tags: 640x480sharp

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LM8V31 Specification

Sharp LM8V31 | High-Contrast STN LCD for Demanding Industrial HMIs

The Sharp LM8V31 is an 8.4-inch VGA monochrome display engineered for environments where data clarity, operational robustness, and long-term reliability are non-negotiable. While modern full-color displays dominate the consumer space, this DSTN (Dual-scan Super-twisted Nematic) panel holds a critical position in the world of industrial LCD displays. It delivers exceptional contrast and readability for essential human-machine interface (HMI) applications, offering a purpose-built solution that excels in its intended role.

Key Performance Specifications

Designed for straightforward integration and consistent performance, the Sharp LM8V31 provides the core specifications engineers require for industrial control and monitoring systems. The following table highlights its most critical operational parameters.

ParameterValue
Screen Size8.4 inch (21 cm) diagonal
Display TechnologyDSTN (Dual-scan Super-twisted Nematic) LCD
Resolution640 x 480 pixels (VGA)
Pixel Pitch0.267 x 0.267 mm
Active Area170.8 x 128.1 mm
Backlight System1 x Cold Cathode Fluorescent Lamp (CCFL)
InterfaceParallel Digital (4-bit)

For a complete breakdown of electrical ratings, timing diagrams, and mechanical drawings, you can Download the Sharp LM8V31 Datasheet.

An Engineer's Look at the LM8V31's Core Technology

Understanding the design choices behind the Sharp LM8V31 reveals why it remains a superior option for specific industrial use cases.

  • DSTN for Unambiguous Clarity: Unlike simple STN, the dual-scan architecture of this panel significantly improves contrast and reduces crosstalk between pixels. This results in crisp, high-contrast text and graphics, which is paramount for reducing operator error when displaying critical process values, alarms, or menu systems. It provides a stable, clear image without the complexity and higher power draw of an a-Si TFT (Amorphous Silicon) panel.
  • Reliable CCFL Backlighting: The integrated Cold Cathode Fluorescent Lamp (CCFL) is a proven technology known for its high brightness and predictable operational lifespan. In industrial settings, knowing a component's end-of-life behavior is crucial for scheduled maintenance. The CCFL system delivers bright, even illumination across the screen, ensuring readability under a variety of factory and lab lighting conditions.
  • Industry-Standard VGA Resolution: The 640x480 resolution is a cornerstone of industrial computing. This standard ensures seamless compatibility with a vast number of embedded systems, single-board computers, and legacy controllers without the need for complex scaling or driver development. It’s an ideal resolution for presenting information-dense interfaces without overwhelming the operator.

Proven Application Value Across Industries

The true value of the LM8V31 lies in its performance within its target applications, where it solves specific engineering challenges.

  • Industrial Control Panels: For CNC machines, injection molding controllers, and PLC interfaces, the LM8V31 provides an exceptionally clear and stable HMI. Its monochrome nature eliminates any potential for misinterpretation due to color shifting or washout, making it a safer choice for critical machine functions.
  • Medical and Test Equipment: In laboratory instruments and medical diagnostic devices, data integrity is everything. The high-contrast black-on-green (or blue) output ensures that numerical readouts and waveform data are presented without ambiguity, supporting accurate analysis and operation.
  • Legacy System Retrofit (MRO): This is a primary application. A vast amount of capital equipment in operation today was designed around this exact display format. The Sharp LM8V31 serves as a form, fit, and function drop-in replacement, enabling maintenance, repair, and overhaul (MRO) that extends the life of valuable machinery and avoids the immense cost of a complete system redesign. Ensuring proper maintenance can further extend the life of these critical assets.

Frequently Asked Questions for the Sharp LM8V31

Our engineers often receive questions about integrating legacy components into modern and existing systems. Here are two common points regarding the LM8V31.

  • What is the typical lifespan of the CCFL backlight?CCFL backlights are known for their durability, typically rated for 20,000 to 50,000 hours of operation before reaching half-brightness. This predictable degradation curve allows for scheduled replacement. The backlight and its associated inverter are modular, making service a practical option for extending the display's service life.
  • Is this display compatible with modern controllers like a Raspberry Pi?Not directly. The LM8V31 uses a parallel digital interface that was standard for its time, requiring multiple data lines and sync signals (HSYNC, VSYNC). Modern single-board computers typically output HDMI, DSI, or LVDS. To use this display with such a source, an intermediary controller board or FPGA would be required to convert the signal. For guidance on your specific application, it's always best to contact our technical team for expert advice.
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