Backlight Module Light Shielding Layer for Narrow Bezel Displays
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Solution Overview
Problem
In display devices with narrow bezel structures, light scattering at the end edge of the optical film leads to a light halo problem at the border of the viewable area, as existing solutions fail to effectively shield the scattered light.
Innovation Solution
A backlight module comprising a light guide plate, a light source, an optical film set, and at least one light shielding layer, where the light shielding layer is disposed on the end surfaces of the optical film set to absorb or block scattered light, reducing the light scattering phenomenon and preventing the light halo issue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the bezel width is reduced to enlarge the viewable area, then the display area is increased, but light scattering at the optical film end edge causes light halo problems at the border of the viewable area
Solution Approach 1:
A light shielding layer is introduced as an intermediary component between the optical film and the display panel border. This layer specifically targets and blocks the scattered light at the optical film end edge, preventing it from reaching the display panel and causing light halo problems, while not affecting the overall viewable area
Solution Approach 2:
The light shielding layer is applied locally only at the end edge region of the optical film where light scattering occurs, rather than covering the entire optical film. This localized treatment effectively blocks scattered light at the problem area while maintaining the optical performance of the rest of the display
2Object-affected harmful factors
If a light shielding layer is added to block scattered light, then the light halo problem is reduced, but the device complexity increases
Solution Approach 1:
The light shielding layer utilizes black or dark-colored material that naturally absorbs and blocks light. By leveraging the light-blocking properties of dark colors, the patent achieves effective scattered light reduction without requiring complex multi-layer optical structures or active control mechanisms
Solution Approach 2:
The light shielding layer can be implemented as a simple adhesive tape or coating that is easy to apply and remove. This disposable-like component provides effective light shielding without the need for permanent, complex structural modifications to the backlight module
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 implementation of the light shielding layer at the end surfaces of the optical film set in the backlight module effectively minimizes light scattering, ensuring a uniform picture by preventing light from being scattered out of the end surface, even in narrow bezel display devices, thus enhancing the overall display quality.
Implementation Method 1
the light shielding layer is disposed on the end surfaces of the optical film set to absorb or block scattered light
Data Source
Figure 1
Figure 2~4
AI summary
A backlight module includes a light guide plate, a light source, an optical film set and at least one light shielding layer. The light guide plate has a light incident surface and a light emitting surface adjacent to the light incident surface. The light source is disposed beside the light incident surface. The optical film set includes a first surface, a second surface and at least one end surface. The first surface and the second surface are opposite to each other. The at least one end surface is connected to the first surface and the second surface. The optical film set is disposed on the light emitting surface of the light guide plate. The first surface faces the light emitting surface. The at least one light shielding layer is disposed on the at least one end surface. A display device using the backlight module is also provided.