Sharp LQ121S1LG55 12.1 Inch TFT LCD Panel

The Sharp LQ121S1LG55 is a 12.1-inch industrial TFT-LCD module designed for equipment requiring an 800 × 600 SVGA display. It uses a-Si TFT-LCD technology with a TN, Normally White, Transmissive display mode and provides a traditional 4:3 format. The panel has a 246.0 × 184.5 mm active display area and approximately 82 PPI pixel density.

The display offers a typical luminance of 330 cd/m² and a typical contrast ratio of 450:1. It supports 16.2 million colors with approximately 72% NTSC color coverage. The panel provides viewing angles of 70° left, 70° right, 50° up, and 60° down under the specified CR ≥ 10 condition. It also features an antiglare surface and 3H hard coating.

The LQ121S1LG55 uses a 1-channel, 8-bit LVDS interface with a 20-pin connector and operates from a typical 3.3V supply. It uses two CCFL backlight lamps with a specified 50,000-hour life, while the backlight driver is not integrated into the module. The supplied product page identifies the unit as refurbished and provides a 3-month warranty.

The LQ121S1LG55 is particularly relevant for replacing original displays in compatible industrial PCs, HMI systems, automation equipment, instrumentation, monitoring equipment, and other legacy systems where the exact electrical and mechanical configuration needs to be maintained.

Key Features

• Sharp LQ121S1LG55 industrial TFT-LCD module
• 12.1-inch diagonal display
• 800 × 600 SVGA resolution
• Approximately 82 PPI pixel density
• 4:3 aspect ratio
• a-Si TFT-LCD technology
• TN, Normally White, Transmissive display mode
• 246.0 × 184.5 mm active display area
• 330 cd/m² typical luminance
• 450:1 typical contrast ratio
• 16.2M supported colors
• Approximately 72% NTSC color coverage
• RGB vertical stripe pixel arrangement
• Antiglare surface treatment
• 3H hard coating
• 1-channel, 8-bit LVDS interface
• 20-pin connector
• 60 Hz refresh rate
• 3.3V typical supply
• Two CCFL backlight lamps
• 50,000-hour specified backlight life
• External backlight driver required
• -10°C to 75°C operating temperature
• -30°C to 75°C storage temperature
• Refurbished condition
• 3-month warranty

Technical Specifications

The specifications above are based primarily on the supplied product page and cross-checked against available technical references for the exact LQ121S1LG55 model.

12.1 Inch 800 × 600 SVGA Display

The Sharp LQ121S1LG55 features a 12.1-inch diagonal display with an 800 × 600 SVGA resolution. Its 246.0 × 184.5 mm active area follows the traditional 4:3 format used in many industrial computers, HMI systems, measuring instruments, and legacy embedded systems.

The approximately 82 PPI pixel density is suitable for displaying machine parameters, numerical readings, menus, alarms, status information, control interfaces, charts, and other industrial operating information.

For replacement applications, the screen size and resolution should only be treated as part of the compatibility check. The active area, outline dimensions, mounting arrangement, connector, LVDS pinout, supply voltage, backlight system, and controller requirements should also match the original equipment.

Display Technology

The LQ121S1LG55 uses amorphous silicon TFT-LCD technology with a TN, Normally White, Transmissive display mode. This configuration is characteristic of many industrial and legacy LCD modules.

The panel uses an RGB vertical stripe arrangement and supports 16.2 million colors with approximately 72% NTSC color coverage.

The TN display technology provides the optical characteristics specified for this model. When replacing the panel, a display using a different technology, such as IPS, should not be assumed to provide identical viewing characteristics or electrical compatibility.

Brightness and Contrast

The LQ121S1LG55 has a typical luminance of 330 cd/m² and a typical contrast ratio of 450:1. These specifications describe the display's brightness and its ability to differentiate between darker and brighter areas of an image.

The specified viewing angles are 70° left, 70° right, 50° up, and 60° down under the CR ≥ 10 condition. The specified viewing direction is 6 o'clock.

The display surface uses antiglare treatment and 3H hard coating. These surface characteristics can be useful in industrial environments where ambient reflections and routine handling are considerations.

Interface and Connector

The Sharp LQ121S1LG55 uses a single-channel, 8-bit LVDS interface through a 20-pin connector. The panel operates from a typical 3.3V supply and supports a 60 Hz refresh rate.

Available technical documentation identifies the 20-pin connector as a Hirose DF14-series connection. The technical documentation also identifies the connector as carrying the LVDS display signals, 3.3V power, ground, and control connections.

A 20-pin connector does not automatically guarantee compatibility with another LCD. The complete LVDS pinout, signal mapping, channel configuration, voltage requirements, timing, connector orientation, and controller electronics must be checked before installation.

This is particularly important for legacy LCD replacements because two displays with the same connector count can have different electrical configurations.

Backlight

The LQ121S1LG55 uses two CCFL backlight lamps with a specified life of 50,000 hours. The backlight driver is not integrated into the LCD module and requires suitable external drive circuitry.

The technical documentation describes the backlight as an integral CCFL system with replaceable lamps and without a built-in backlight driver.

When replacing this panel in legacy equipment, the existing CCFL inverter or backlight driver should be checked for compatibility. The backlight system should be evaluated separately from the LVDS signal interface.

An LED-backlit LCD should not be assumed to be a direct replacement for the LQ121S1LG55 simply because it has the same 12.1-inch size and 800 × 600 resolution.

Mechanical Dimensions

The LQ121S1LG55 has an active display area of 246.0 × 184.5 mm and a bezel area of approximately 249.0 × 187.5 mm. Its overall dimensions are approximately 276.0 × 209.0 × 11.0 mm, with a maximum specified mass of 660 g.

These dimensions are important when installing the LCD into an existing industrial enclosure. The original equipment should be checked for sufficient clearance around the display, mounting points, connector, and CCFL wiring.

Two 12.1-inch SVGA displays may share the same resolution and active area but still differ in outer dimensions, thickness, mounting arrangement, or connector location. Therefore, physical measurements should be compared before ordering.

Operating Temperature

The LQ121S1LG55 is specified for an operating temperature range of -10°C to 75°C and a storage temperature range of -30°C to 75°C. Available technical references also specify a maximum vibration level of 1.0G, equivalent to approximately 9.8 m/s².

These environmental specifications apply to the LCD module. The controller, power supply, CCFL inverter, cables, and equipment enclosure may have different temperature limitations.

For installations exposed to temperature extremes, the complete display assembly and surrounding electronics should be evaluated against their respective specifications.

Industrial Applications

The Sharp LQ121S1LG55 is suited to industrial and embedded systems that require a 12.1-inch SVGA display with a single-channel LVDS interface and CCFL backlight.

Potential applications include:

• Industrial PCs
• HMI systems
• Industrial control panels
• CNC machine interfaces
• Factory automation equipment
• Machine monitoring systems
• Process control equipment
• Measuring instruments
• Industrial instrumentation
• Embedded computing systems
• Industrial monitoring equipment
• Medical equipment with compatible display electronics
• Operator interface terminals
• Legacy industrial machinery
• Equipment requiring replacement of an original 12.1-inch SVGA LCD

The actual suitability depends on the electrical, mechanical, environmental, controller, and backlight requirements of the target equipment.

Compatibility and Replacement Note

The Sharp LQ121S1LG55 is a legacy LCD module and should be selected for replacement only after comparing its complete specifications with the original display.

Before purchasing or installing the panel, verify:

• Exact original LCD model and suffix
• 12.1-inch screen size
• 800 × 600 resolution
• Active display area
• Bezel opening
• Overall dimensions
• Panel thickness
• Mounting holes and mounting arrangement
• Connector type and location
• 20-pin connector configuration
• Complete LVDS pinout
• Single-channel, 8-bit LVDS configuration
• Display timing requirements
• LCD supply voltage
• CCFL backlight configuration
• CCFL inverter requirements
• Backlight current and voltage requirements
• Controller compatibility
• Operating temperature requirements
• Mechanical clearance inside the equipment

A similar 12.1-inch size, 800 × 600 resolution, or 20-pin connector does not automatically mean that another LCD is a direct replacement.

Connector type alone is not sufficient to establish compatibility. The exact model and suffix, active area, dimensions, mounting, LVDS pinout, voltage, timing, backlight system, inverter, and controller compatibility should all be verified.

The LQ121S1LG55 technical documentation identifies the panel as a 1-channel, 8-bit LVDS module using a 20-pin connector and a 3.3V supply, making these specifications particularly important when replacing an existing panel.

For legacy replacement applications, compare the model number printed on the original LCD with LQ121S1LG55 and verify the complete technical specifications before ordering.

Product Details

Product: Sharp LQ121S1LG55 LCD Module
Brand: Sharp
Model: LQ121S1LG55
Display Size: 12.1 inches
Resolution: 800 × 600 pixels, SVGA
Panel Type: a-Si TFT-LCD, LCM
Display Type: Color TFT-LCD Module
Display Mode: TN, Normally White, Transmissive
Interface: LVDS, 1 channel, 8-bit
Connector: 20-pin
Brightness: 330 cd/m² typical
Contrast Ratio: 450:1 typical
Supply Voltage: 3.3V typical
Backlight: 2 × CCFL
Backlight Life: 50,000 hours
Backlight Driver: External driver required
Operating Temperature: -10°C to 75°C
Storage Temperature: -30°C to 75°C
Touch Screen: No touchscreen specified
Condition: Refurbished
Warranty: 3 months

Handling and Installation Precautions

The LQ121S1LG55 contains delicate LCD glass, a front polarizer, driver electronics, and CCFL backlight circuitry. Handle the module carefully during removal, inspection, and installation.

• Avoid applying pressure directly to the LCD glass.
• Do not scratch or damage the front polarizer.
• Keep sharp tools and hard objects away from the display surface.
• Power off the equipment before connecting or disconnecting the LCD.
• Handle the 20-pin LVDS connector carefully.
• Do not rotate or tilt the connector during insertion or removal.
• Verify the complete LVDS pinout before applying power.
• Confirm the required 3.3V supply before installation.
• Verify the LVDS channel configuration and timing.
• Confirm the CCFL inverter and backlight requirements.
• Do not connect or disconnect the backlight while power is applied.
• Be aware that CCFL backlight circuits can involve high-voltage drive circuitry.
• Follow appropriate ESD precautions when handling the module.
• Keep water and moisture away from the display.
• Wipe away water drops immediately to help prevent discoloration or spots.
• Avoid dropping, bending, or striking the LCD panel.
• Do not place excessive mechanical stress on the rear circuit board or connectors.
• Do not open or modify the LCD module unnecessarily.
• Provide adequate clearance for the LVDS connector and CCFL cables.
• Confirm that the equipment operates within the specified temperature range.

Frequently Asked Questions

What is the Sharp LQ121S1LG55?

The Sharp LQ121S1LG55 is a 12.1-inch a-Si TFT-LCD module with an 800 × 600 SVGA resolution, TN Normally White display mode, single-channel 8-bit LVDS interface, and CCFL backlight.

What is the resolution of the LQ121S1LG55?

The LQ121S1LG55 has an 800 × 600 pixel SVGA resolution.

What is the screen size of the LQ121S1LG55?

The Sharp LQ121S1LG55 has a 12.1-inch diagonal display with a 246.0 × 184.5 mm active display area.

What type of display is the LQ121S1LG55?

It is an a-Si TFT-LCD module using TN, Normally White, Transmissive display technology.

What is the brightness of the LQ121S1LG55?

The typical luminance is 330 cd/m².

What is the contrast ratio of the LQ121S1LG55?

The typical contrast ratio is 450:1.

What interface does the LQ121S1LG55 use?

The panel uses a single-channel, 8-bit LVDS interface.

How many pins does the LQ121S1LG55 connector have?

The LQ121S1LG55 uses a 20-pin LVDS connector. Connector count alone does not establish compatibility, so the complete pinout and electrical configuration should be verified before installation.

What type of backlight does the LQ121S1LG55 use?

The panel uses two CCFL backlight lamps with a specified 50,000-hour life. The backlight driver is not integrated into the module and suitable external drive circuitry is required.

Does the LQ121S1LG55 have a touchscreen?

No touchscreen is specified for the LQ121S1LG55. It is supplied as an LCD display module without an integrated touch panel.

What are the dimensions of the LQ121S1LG55?

The active display area is 246.0 × 184.5 mm, while the overall dimensions are approximately 276.0 × 209.0 × 11.0 mm. The maximum specified weight is 660 g.

What is the operating temperature of the LQ121S1LG55?

The specified operating temperature range is -10°C to 75°C, while the storage temperature range is -30°C to 75°C.

Can the LQ121S1LG55 be used as a replacement LCD?

It can be considered for compatible industrial and embedded equipment requiring a 12.1-inch 800 × 600 TFT-LCD with a single-channel 8-bit LVDS interface. Before installation, verify the exact model and suffix, dimensions, mounting, 20-pin LVDS pinout, supply voltage, timing, CCFL backlight requirements, inverter, and controller compatibility. A similar screen size, resolution, or connector does not automatically guarantee direct compatibility.