2026-07-16Welcome back to Redot's comprehensive LED video screen terminology series! In Part 1, we laid the foundation with basic concepts like LED, pixel pitch, and SMT. In Part 2, we explored brightness, grayscale, contrast ratio, and color temperature. If you have been following along, you are already well ahead of most industry newcomers.
Today, in Part 3, we are diving into the technical performance parameters that separate high-end display panel LED solutions from budget alternatives. These are the specifications that directly impact visual quality, installation flexibility, and long-term reliability. Whether you are involved in LED panels display sourcing, system integration, or technical sales, mastering these terms will elevate your professional credibility.
Let us continue our learning journey with 9 more essential definitions.
The frame rate determines the smoothness of video playback. Common values include:
60 Hz – Standard for high-quality video content and live broadcasts
For professional applications, a 60 Hz frame rate is now the baseline for acceptable motion quality on any LED panels for display.
Refresh rate is the number of times the LED screen re-scans and re-displays the entire image per second, also measured in Hertz (Hz).
This is one of the most critical specifications for any LED video screen.
Camera-friendly performance – eliminates moiré patterns when filming
High refresh: 1,920 Hz, 3,840 Hz, or even 7,680 Hz – essential for professional rental, broadcast studios, and events where cameras are present
For studios and live-event productions that require video recording or live broadcasting, a refresh rate of at least 3,840 Hz is strongly recommended to avoid unsightly moiré patterns on camera screens. High refresh rates also significantly reduce eye fatigue for audiences watching the panel LED display for extended periods.
These two concepts are often confused, but they define different things:
The viewing angle of an LED video screen is the maximum angle (measured from the perpendicular center line, or "normal") at which the screen's brightness drops to 50% of its center-front brightness. It includes both horizontal and vertical directions.
Most modern display panel LED screens offer a viewing angle of 140° ~ 160° (both horizontally and vertically).
The best viewing angle is the range within which the screen displays the most saturated colors, no color shift, and the sharpest details – without any distortion or color cast.
Vertical: Approximately 120° centered on the screen.
When planning your installation, always position the audience within the best viewing angle range to deliver the intended visual impact. Viewing angle is acceptable for peripheral viewers, but the prime viewing zones should fall within the best angle.
The optimal viewing distance is the distance from the screen at which the viewer can see the entire LED video screen without any color shift, and where the image appears sharpest – without perceiving individual pixel dots.
Optimal Viewing Distance (meters) ≈ Pixel Pitch (mm) × 1.5 ~ 3.0
P6.9 LED panel Optimal distance = 10.35 ~ 20.7 meters
When viewers stand within this range, their eyes naturally blend the pixels into a smooth, continuous image. Selecting the right pixel pitch based on your venue's viewing distance is a fundamental rule in LED panels display design.
In the LED video screen industry, an out-of-control pixel refers to any pixel that does not behave according to the control signal. These are typically categorized into three types:
Flickering pixels: Intermittently flashing or unstable
The overall out-of-control pixel rate directly determines the quality and usability of the display panel LED. For premium LED panels for display, manufacturers maintain extremely low defective pixel rates (often < 1/10,000).
These two drive methods define how the LED video screen controls its pixels:
Each pixel is independently and directly controlled by the driver IC on a point-to-point basis.
Disadvantages: Higher component count, higher cost, generates more heat.
Indicator: A static-drive PCB does not require row-scan control circuits.
Pixels are controlled on a point-to-column basis using time-division multiplexing (e.g., 1/16 scan, 1/32 scan).
The screen relies on the persistence of vision – each row lights up in sequence rapidly.
Disadvantages: Lower brightness (brightness decreases as scan rate increases), lower stability, poorer display quality, higher flicker risk.
Indicator: A scanning-drive PCB requires row-scan control circuits.
For high-end rental, broadcast, and fine-pitch indoor applications, static drive is always preferred despite the higher cost. For large outdoor billboards where the audience is far away and cost is a major factor, scanning drive may be acceptable.
The driver IC outputs a fixed, predetermined current regardless of load variations (within its operating range).
Advantage: Provides consistent current to each LED, eliminating brightness differences caused by variations in LED chip internal resistance. This ensures excellent uniformity.
The driver IC outputs a fixed, predetermined voltage regardless of load variations.
With the advancement of technology, constant-voltage drive has been largely replaced by constant-current drive in modern LED displays. Constant-current drive solves the critical problem where differences in LED chip resistance caused uneven current distribution – leading to patchy brightness. Today, virtually all professional LED video screen panels use constant-current drive as the industry standard.
When a computer outputs a digital video signal, the relationship between the digital value and the actual light output of an LED is not linear. If this signal is displayed directly on an LED video screen without correction, the image will suffer from color distortion – dark areas may appear too dark, and bright areas may lack detail.
Non-linear correction (for example Gamma correction) is a process applied in the control system. It uses a non-linear function (such as a Gamma curve) to re-map the original video signal before sending it to the display panel LED.
It achieves:
Natural, lifelike images that match human visual perception
Because the input (signal) and output (display brightness) follow a non-linear relationship, this process is called non-linear correction. Always verify that your LED panels display system supports advanced Gamma correction for professional image quality.
These three terms are often mixed up, but they represent distinct concepts in LED video screen electrical engineering:
The rated voltage is the standard design voltage at which the electrical equipment operates normally and at its best performance. Under this voltage, the LED screen delivers its specified brightness, color accuracy, and stability. It is a fixed value determined by the manufacturer.
The operating voltage is the actual voltage value that the equipment is currently experiencing during real-time operation. Due to power grid fluctuations or internal load changes, the operating voltage typically falls within a permissible range (e.g., within ±10% of the rated voltage).
The supply voltage must remain stable within the allowed range of the rated voltage. If the supply voltage is too high or too low, the equipment will malfunction, become unstable, or be permanently damaged. Proper power management is non-negotiable in any professional panel LED display installation.
Congratulations! With Part 3 complete, we have now covered a total of 28 essential terms about the LED video screen industry. From basic definitions to deep technical parameters like Gamma correction, drive modes, and voltage specifications, you now have a robust vocabulary to navigate this exciting field.
These terms are not just academic – they are practical tools that will help you:
Deliver better value to your customers
