Under-Screen Display Panel Light Guide Column to Eliminate Black Ring
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Solution Overview
Problem
The appearance of a black ring in the display panel area corresponding to the camera module due to light leakage and conventional adhesive-dispensing and backlighting affects the overall appearance of terminals.
Innovation Solution
A display panel design incorporating a light guide column with a reflective coating in the through hole of the backlight module to reflect back light emitted from the backlight's film layers, ensuring minimal light leakage and normal camera imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a through hole is provided in the backlight module to accommodate the camera module, then the camera can be positioned under the screen, but light leaks from the cross-section of the light guide plate causing a black ring to appear in the display panel area
Solution Approach 1:
A light guide column is introduced as an intermediary component to fill the through hole in the backlight module. This light guide column acts as a mediator between the camera module and the light guide plate, preventing light leakage at the through hole cross-section while maintaining the under-screen camera positioning. The light guide column's refractive index is designed to match or exceed that of the light guide plate, ensuring effective light guidance and preventing black ring formation.
Solution Approach 2:
The refractive index parameter of the light guide column is specifically optimized to be greater than or equal to that of the light guide plate. This parameter change ensures that light traveling through the light guide plate will be refracted into the light guide column rather than leaking out, thereby preventing the black ring effect while maintaining the through hole structure for camera accommodation.
2Ease of manufacture
If conventional adhesive-dispensing and backlighting are used, then the backlight module can be assembled, but the display effect is significantly impacted and a black ring appears in the camera module area
Solution Approach 1:
The light guide column serves as an intermediary that replaces the need for complex adhesive-dispensing processes in the through hole area. By filling the through hole with a light-guiding material, the assembly process is simplified while simultaneously improving display quality by eliminating the black ring effect caused by conventional adhesive methods.
3Ease of manufacture
If the diameter of the light guide column is made smaller than the through hole to allow assembly, then the light guide column can be installed, but a gap remains that may affect light guidance effectiveness
Solution Approach 1:
The diameter difference between the light guide column and through hole is precisely controlled within the range of 50-150 μm. This parameter optimization allows the light guide column to be successfully installed while maintaining effective light guidance. The small gap is sufficient for assembly tolerance but small enough to prevent significant light leakage, especially when combined with the refractive index matching principle.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively eliminates the black ring caused by light leakage, enhancing the camera's imaging quality and improving the terminal's appearance.
Implementation Method 1
a light guide column with a reflective coating in the through hole of the backlight module to reflect back light emitted from the backlight's film layers
Data Source
AI summary
A display panel and a terminal. The display panel includes a liquid crystal array matrix cell, a backlight module, a light guide column, and an electrochromic module. A through hole is formed in the backlight module, and the through hole is used for accommodating the light guide column. The liquid crystal array matrix cell is located on a first side of the backlight module, the electrochromic module is located on a second side of the backlight module, and the first side of the backlight module and the second side of the backlight module are opposite sides.