Blog Details

In the selection process of LED display projects, specification sheets serve as a "universal language" for technical communication. Behind these seemingly cold numbers lie a comprehensive reflection of product performance, application scenarios, and long-term reliability. This article disassembles each technical indicator, its selection logic, and practical value based on the specification sheet of a fully flip-chip COB fine-pitch LED display, enabling you to easily understand the "technical manual" of LED displays.

I. Module & Unit Composition: The "Basic Building Blocks" of the Display

An LED display is not a single panel but is assembled from modules and unit cabinets step by step. These parameters directly determine the splicing accuracy, operation and maintenance convenience, and installation compatibility of the display.

1. Pixel Structure: Fully Flip-Chip COB Packaging

SMD packaging involves soldering individual lamp beads onto a PCB board. In contrast, fully flip-chip COB (Chip On Board) directly solders LED chips onto the PCB board via flip-chip bonding, followed by overall encapsulation with an adhesive layer. This process offers the following advantages: no bonding wires or exposed solder joints, significantly enhanced resistance to impact, moisture, and oxidation, making it particularly suitable for close-viewing scenarios.

2. Pixel Pitch & Pixel Density

Pixel Pitch (mm): The distance between two adjacent LED pixels, measured in millimeters. It is the core indicator determining image sharpness. A smaller value means denser pixels, delivering finer images without graininess when viewed up close.

Pixel Density (dots/m²): The total number of pixels per square meter of display area, typically expressed as dots per square meter. A smaller pixel pitch results in more pixels per unit area and higher pixel density, delivering finer details and a grain-free viewing experience for high-definition close-view scenarios. Conversely, low pixel density leads to noticeable graininess, suitable only for long-distance viewing.

3. Module/Unit Resolution & Dimensions

Module Resolution: The horizontal × vertical pixel count of a single module (e.g., 160×180, 120×135), defining the basic display capability of the module.

Unit Resolution: The total pixel count of a single cabinet, formed by module splicing (e.g., 640×360, 480×270), directly influencing the final resolution of the entire display.

Unit Dimensions: The physical size of the cabinet (e.g., 600×337.5×39.75mm). Standardized cabinet dimensions are critical for seamless splicing and determine installation compatibility (e.g., matching with steel structures and control room space).

4. Module/Unit Weight

The specification sheet lists module weight and unit weight, key indicators during installation. Weight affects not only the load-bearing design of steel structures but also the safety of transportation and hoisting.

II. Optical Parameters: The "Core Experience Indicators" Determining Display Quality

Optical parameters directly define the display’s image quality, the most intuitive user experience, and a core comparison dimension for selection.

1. Brightness & White Balance Brightness

Brightness (nits): Luminance per unit area, measured in nits. A white balance brightness of ≥550~600 nits, as specified in the sheet, is mainstream for indoor displays, meeting the needs of conference rooms, command centers, and similar scenarios while avoiding visual fatigue from excessive brightness.

Brightness Uniformity (≥97%): A critical indicator representing brightness consistency across different areas of the display. A higher value eliminates issues like "uneven brightness" or "dark corners."

2. Color Temperature & Color Gamut

Color Temperature (K): Adjustable from 3000K to 10000K, enabling the display to switch from warm white (3000K, yellowish) to cool white (10000K, bluish). This adapts to various ambient lighting conditions—6500K standard color temperature is common for conference rooms, while stage scenes allow mood adjustment via color temperature tuning.

Color Gamut: COB packaging supports a wider color gamut coverage, paired with precise chromaticity uniformity control of ±0.003, ensuring true color reproduction and eliminating color distortion.

3. Viewing Angle & Emission Point Deviation

Viewing Angle (Horizontal/Vertical ≥160°): Within 160° from the display center, brightness and color show no significant attenuation, suitable for multi-viewer scenarios such as large conference rooms and command hall

Emission Point Center Deviation (<3%): Controls positional offset of LED pixels. Smaller deviation results in straight, jagged-free spliced lines with no misalignment—a key process indicator for high-end displays.

4. Contrast Ratio

A contrast ratio of 10000:1, as specified, is critical for image layering. High contrast delivers purer blacks and brighter whites, with rich light and dark details. Dark images and text appear sharp-edged without a hazy effect.

5. Calibration Capability

Support for single-pixel brightness and color calibration means the display undergoes pixel-by-pixel correction before delivery, correcting brightness and color deviations of individual LEDs to ensure uniform brightness and color across the entire screen—a mandatory feature for high-end LED displays.