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Why TFT LCD Screens Exhibit Color Deviation and Its Causes

Color distortion in TFT LCD screens can be attributed to several factors, each playing a role in influencing the display's color accuracy. Understanding these factors is crucial for both manufacturers and consumers. Here are three key contributors:

1. LED Backlight Batch Variations:

  • LED Backlight Batch Codes: The LEDs used in the backlighting of TFT LCD screens emit light that combines to produce white light. In the case of RGB white light LEDs, variations in the manufacturing batch can lead to subtle differences in color output. The white light wavelength specifications (X: 0.28~0.32, Y: 0.27~0.31) may slightly vary, causing deviations in color.

  • Effects on Color Representation: LEDs, being electronic optical devices, exhibit slight variations in color generation between different batch codes. These variations directly impact the color representation of the liquid crystal display, contributing to differences in color perception.

2. Polarizing Film Variability:

  • Construction of Polarizing Film: Polarizing films, composed of two layers of fiber materials, induce a polarizing effect. Their application in TFT LCD screens involves surface and film layers, each containing specific polarizing layers such as TAC layer, adhesive, separation film, protective film, and reflective film. These layers reflect different colors in various dimensions, contributing to the overall color effect.

  • Impact of Rotation Angles: The rotation angles of polarizing films, which may differ between batches, directly influence the final display result. Variability in the production batch of polarizing films can lead to color discrepancies in TFT LCD screens.

3. Varied Operating Voltage:

  • Differences in Working Voltage: Glass substrates in TFT LCD screens may have varying working voltages during the manufacturing process. While efforts are made to adjust the output voltage, achieving complete uniformity is challenging (typically within ±0.5V). As a result, it is recommended for users to have the flexibility to adjust brightness and contrast settings through applications or hardware.

  • Recommendations for User Adjustment: Given the nuanced impact of different batch codes on TFT screens, manufacturers advise users to incorporate features for adjusting brightness and contrast, either through applications or hardware settings, to achieve optimal visual results.

In conclusion, the color representation of TFT LCD screens is influenced by LED backlight batch variations, polarizing film characteristics, and differences in operating voltages. Manufacturers strive to address these factors to meet customer specifications, emphasizing the importance of batch uniformity to minimize color deviations across TFT screens. This understanding helps users make informed choices and appreciate the intricacies involved in TFT LCD screen manufacturing.



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