LED displays play a pivotal role in our daily lives, and their vibrant, colorful presence is everywhere. Whether it's single-color, dual-color, or full-color displays, for home use, commercial promotion, or public transportation, LED displays add convenience and vibrancy to our lives. This is all thanks to people's pursuit of a better life, their demand for perfection in LED display colors, and continuous technological advancements.

Among the technologies supporting the color performance of LED displays, chromatic processing technology is the key to determining the quality of the display. This includes base color wavelength selection, white field color temperature adjustment, color reproduction (color space conversion), chromatic uniformity correction, and multi-primary color processing. Let’s explore these technologies and their applications in detail.

 1. Base Color Wavelength Selection

For single-primary color LED displays, selecting the appropriate base color wavelength is crucial. In certain industries, the choice of base colors must follow specific regulations. For instance, in the securities industry, red typically represents a stock price increase, green indicates a decrease, and yellow signals no change. In the transportation industry, national standards strictly regulate that blue-green wavelengths signify "go," while red wavelengths mean "stop."

 2. White Field Color Temperature Adjustment for LED Displays

The color of a light source is often represented by its color temperature. When the light emitted by a source matches the color of light radiated by a black body at a certain temperature, that temperature is considered the light source's color temperature. The white field color temperature of an LED display refers to the color temperature when a white image is displayed.

Different color temperatures evoke different feelings: below 3000K, the light gives a warm feeling, 3000K-5000K provides a cool sensation, and above 5000K conveys a cold impression. Color temperatures below 3000K are ideal for creating a warm atmosphere, commonly used in home lighting, while color temperatures above 5000K are often applied in places requiring bright lighting, such as meeting rooms. Adjusting the color temperature of an LED display can be achieved by changing the current, adjusting the brightness of the three colors, or modifying the display’s component parameters.

 3. Color Reproduction (Color Space Conversion) Technology

In television broadcasting, there are often discrepancies between the chromatic coordinates of an LED display and the standard TV chromatic coordinates, leading to inaccurate color reproduction, especially when rendering skin tones, which can appear too red. Color reproduction technology compresses the chromatic coordinates of the LED display to fit the PAL or NTSC chromatic coordinates used in television broadcasting, achieving accurate color reproduction. For example, Nova Technology's NovaLCT-Mars software can perform this function.

 4. Chromatic Uniformity Correction Technology

Due to the luminance and color dispersion of LED lights, even strictly categorized LED lamps will exhibit differences in brightness and color. This discrepancy can cause uniform color displays to appear with varying brightness levels across the same color on the LED screen. To achieve optimal display performance, chromatic uniformity correction is required for each LED light. Nova's point-by-point correction system enables precise chromatic correction, ensuring the brightness and color of each LED lamp are highly consistent, thereby enhancing the overall display effect.

Before correction: LED display screen

After correction using Nova's point-by-point correction system

 5. Multi-primary Color Processing

Traditional LED displays typically use red, green, and blue (RGB) primary colors to mix and display various colors. Multi-primary color processing technology expands on this by introducing one or more additional primary colors (such as yellow or cyan), which extends the color gamut and enhances the accuracy and saturation of the displayed colors. For example, in four-primary color televisions, adding yellow as a primary color allows for the perfect rendering of golden tones.

Comparison of golden color effects under RGB and four-primary color technologies in Sharp televisions