It's the same model, but the display color is different? Here's the reason

Have you ever encountered this situation: Display screens from the same batch appear to have different colors when placed side by side? Some people even wonder if color differences are guaranteed between different batches. This isn't necessarily the case. To understand this, we must first understand what determines the color of a display screen.

Main reasons:
1. Backlight System: Backlight is the "base color" of the display screen. LEDs are categorized as cool or warm: cool LEDs have a bluish tint, while warm LEDs have a yellowish tint. Even with identical parameters, LEDs from different batches can exhibit subtle differences. Furthermore, the film materials used in the backlight module (such as diffuser and brightness enhancement film) can significantly affect color.

2. The liquid crystal material and polarizer in the LCD panel are equally critical: polarizers come in various finishes, such as matte, frosted, and glossy, resulting in completely different visual effects. The consistency of the liquid crystal material directly determines display stability.

3. Different brands of polarizers have different base colors, resulting in differences in the color of the corresponding display screen.

4. Material Consistency and Quality Control: Under normal circumstances, color variations between displays of the same model and specification are controlled within industry tolerances. If a discrepancy is noticeable to the naked eye, it often indicates a problem in a specific process, such as material substitution. Other Influencing Factors: In addition to the main causes listed above, some easily overlooked factors can also cause color variations: Display driver IC and gamma settings: Differences in IC factory parameters or improper gamma curve adjustment can lead to inconsistent color reproduction. FPC and circuit differences: Differences in circuit impedance or power supply stability can cause slight deviations. Optical bonding process: Batch variations in the transmittance and curing performance of OCA or water-based adhesives used in full bonding can also affect color. Environmental factors: Ambient light color temperature, screen surface reflection, and viewing angle variations can all lead to different color perceptions. Accumulated material tolerances: Even if individual materials are within tolerance, the cumulative differences in multiple processes can amplify visible color variations. Lifespan and aging: Backlight LEDs gradually degrade over time, especially blue light, which degrades more rapidly, leading to a yellowish tint after long-term use.

In summary: Display color isn't determined by a single factor; it's the combined effects of multiple processes, including backlighting, LCD, and polarizers, combined with process and environmental factors. Small variations are considered normal tolerances, but significant color differences often stem from irregularities in the supply chain.