Shenzhen Chenghao TFT and Monochrome LCD Display Development and Manufacturing Processes
22 October, 2025
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Today, we will explain the common issue of screen ghosting on TFT IPS screens and how to address it effectively. Understanding this phenomenon can help users maintain optimal display performance and extend the lifespan of their devices.
What is Screen Ghosting?
Screen ghosting occurs when a certain interface remains on the display, and even after switching to a new screen, traces of the previous image remain visible. In simple terms, ghosting happens due to the slight deviation in the rotation angle of the liquid crystal molecules within the display panel.
For most users, this ghosting effect is minor and does not interfere significantly with normal operation. However, in cases where ghosting becomes pronounced, it can affect the visual experience and require attention.
Causes of Severe Ghosting
Severe ghosting is often related to incorrect voltage settings within the TFT IPS screen. There are four core voltage parameters that must be properly adjusted to ensure optimal performance:
AVDD – The positive supply voltage for the display.
VGH – The gate high voltage.
VGL – The gate low voltage.
VCOM – The common voltage that drives the liquid crystal molecules.
If any of these voltage values are misaligned or not set according to the product specifications, ghosting can appear more prominently and may interfere with normal usage.
How to Solve the Ghosting Problem
Solving ghosting is straightforward when the correct approach is followed:
Check the Product Specification Sheet: Refer to the datasheet provided by the manufacturer to understand the recommended voltage parameters for the specific TFT IPS screen.
Adjust Core Voltage Parameters: Set AVDD, VGH, VGL, and VCOM according to the specifications. This ensures the liquid crystal molecules operate at optimal angles, reducing image retention.
Set Parameters to the Optimal Level: For maximum performance, screen parameters can be set to their ideal values, which minimizes ghosting and improves overall display quality.
By carefully following these steps, severe ghosting can usually be eliminated, restoring the display to its intended clarity and responsiveness.
Conclusion
Screen ghosting is a common but manageable issue for TFT IPS displays. While minor ghosting is generally harmless, severe cases can be resolved by adjusting the key voltage parameters. Following the product specifications and ensuring proper voltage alignment can significantly improve display performance and reduce ghosting to the lowest level.
For more detailed information about TFT IPS screens and technical support, please visit our website at www.chenghaodisplay.com or contact our sales staff directly.
