Comprehensive Analysis of Light Leakage Phenomenon in LCD Display Screen
Date:2025-09-04
LCD Light Bleeding refers to the phenomenon of unwanted light spots or halos appearing at the edges or corners of a LCD screen when displaying dark or black images. This is due to the leakage caused by incomplete control of the light from the backlight module.
Analysis of Reasons for Light Leakage
1. Structural design factors
o Uneven border pressure causes deformation of the light guide plate
o Insufficient assembly accuracy of backlight module
o There is a small gap between the rubber frame and the panel
2. Material quality issues
o Uneven material of light guide plate
o Poor quality of reflection and diffusion sheets
o Aging or insufficient performance of sealing materials
3. Process issues
o Stress generated during the assembly process
o Deviation in the installation position of the backlight source
o The packaging process is not perfect
Classification of Leakage Types
Type | Performance characteristics | Common locations |
Edge light leakage | A strip-shaped halo appears around the screen | Four sides of the display screen |
Corner light leakage | Fan shaped light spots appear in the corners of the screen | Four corner area |
Point like light leakage | Fan shaped light spots appear in the corners of the screen | Any position |
Pressure leakage | Temporary light leakage when pressing the screen | Compressed area |
Testing methods and standards
Professional testing methods:
Display pure black images in a completely black environment.
Measure the brightness value of the leakage area using a luminance meter.
• Evaluate according to ISO 9241-307 standard.
Industry acceptance standards:
Edge leakage width ≤ 2mm.
The brightness of the light leakage area shall not exceed 15% of the center brightness.
No obvious point like light leakage.
Solutions and preventive measures
For users:
Adjusting the screen angle can sometimes reduce visual impact.
2. Avoid applying external pressure to the screen.
3. Use appropriate brightness settings.
Solutions and preventive measures
For users:
Adjusting the screen angle can sometimes reduce visual impact.
Avoid applying external pressure to the screen.
Use appropriate brightness settings.
Industry Status and Development
With the advancement of display technology, the problem of light leakage has been significantly improved:
Mini LED backlight technology significantly reduces light leakage.
Direct backlight has better light leakage control than side entry backlight.
OLED technology fundamentally eliminates the problem of light leakage.
Consumer response suggestions
1. Understand the light leakage performance of the product before purchasing.
2. Check if the manufacturer's warranty policy covers the issue of light leakage.
3. For professional purposes (such as graphic design), choose high-end series products.
4. Reasonable Expectations - LCD screens with no light leakage are extremely rare.
summary
LCD screen light leakage is an inherent characteristic of LCD technology, and it is extremely difficult to completely eliminate it. But with technological advancements and process improvements, the problem of light leakage in modern display screens has been greatly reduced. Consumers should have reasonable expectations and awareness of light leakage issues when choosing products based on actual usage and budget.
