Causes and Solutions for Liquid Leakage in Small and Medium-Sized LCD Screens

    LCD screen leakage typically refers to the leakage of liquid/gel-like substances such as liquid crystal material or sealant from within the screen due to external forces or inherent material defects. Common symptoms include abnormal patches (such as black spots, white spots, or lines) or localized malfunctions in the display area. Lightly pressing the edge of the screen can cause a sensation of liquid flowing, which is common in LCD (liquid crystal display) screens. The following details common causes and solutions:

A. Common Causes of LCD Screen Leakage

The sealing performance of an LCD screen depends on the internal adhesive (such as OCA optical adhesive or frame sealant), the lamination process for the glass substrate (or flexible substrate), and the integrity of the outer protective structure. The core cause of leakage is seal failure, which can be categorized as follows:

1. Physical Impact or Pressure

· Severe impact (such as dropping or being squeezed) or scratches from sharp objects can cause the glass substrate (or the encapsulation layer of a flexible screen) to crack, compromising the internal sealing structure.

· Prolonged pressure (such as heavy objects pressing against the screen edges) can cause the sealant to age and crack, leading to slow leakage.

The LCD screen was not properly packaged during delivery, with no wooden frame placed outside the box for protection.

2. Manufacturing Defects

· During the production process, sealant (such as frame glue) may be unevenly applied, insufficiently thick, or incompletely cured (e.g., temperature/time requirements not met), resulting in insufficient initial seal strength.

· Misalignment of the glass substrates (e.g., misalignment of the CF (color filter) and TFT substrate in an LCD), resulting in tiny gaps at the edges.

· Internal microcracks caused by external pressure during assembly (e.g., over-tightening the screen to the middle frame).

3. High Temperature or Environmental Corrosion

· Prolonged exposure to high temperatures (e.g., direct sunlight, exposure in a car, or near a heater) can accelerate sealant aging (loss of elasticity and cracking), reducing sealing performance.

· Exposure to corrosive liquids (e.g., water, alcohol, detergents) or gases (e.g., strong acid or alkali vapors) can corrode the sealant or substrate edges, leading to leakage.

4. Natural Aging

· After years of use, the sealant on the screen gradually loses its adhesiveness due to UV exposure and oxidation, resulting in fine cracks (the encapsulation layer of flexible screens is particularly susceptible to environmental influences).

B. Key Measures to Prevent Leakage

· Avoid physical impact: Use a drop-resistant phone case/tablet cover with tempered glass (especially for curved screens, pay attention to edge protection); use foam or other packaging materials to protect the LCD glass.

· Keep away from high temperatures: Avoid direct sunlight, exposure to the sun in a car (do not leave the device in a car during summer), and keep it away from heat sources such as heaters and ovens.

· Properly clean the screen: Use a screen cleaner (or a soft cloth dampened with water) and gently wipe in the same direction to avoid liquid seeping into the edges and gaps of the screen. Do not use alcohol or disinfectants (which may corrode the sealant).

     Shenzhen Hongjia Technology has 12 years of industry experience, specializing in the research and development, production and sales of 1.14-inch to 10.1-inch LCD screens and matching touch screens. Our shipment packaging is all made of wooden frames, wrapped with foam, and well protected before shipment. The display screen is not damaged when it reaches the customer. We currently serve many Fortune 500 companies and have 36 months of after-sales service, which has received unanimous praise from customers.