Backlight Light-Eliminating Structure for Narrow Bezel Displays
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Solution Overview
Problem
Existing backlight sources in liquid crystal displays suffer from bright lines at the edges due to light rays being reflected back into the light-guiding plate, leading to increased brightness in local areas and reduced valid display area, particularly in mobile phone designs with narrow bezels.
Innovation Solution
A backlight source design featuring a light-guiding plate with a glue frame forming a light-eliminating structure, including protrusions, inclined surfaces, and light-absorbing layers to absorb and redirect light rays exiting from non-light-incidence sides, thereby reducing reflections and improving image quality without increasing the overlapping area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional backlight source structure is used, then the structure is simple and easy to manufacture, but bright lines appear at the edges due to light ray reflections
Solution Approach 1:
The patent converts the harmful reflected light rays into beneficial effects by using light-absorbing materials to absorb the reflected light, preventing it from re-entering the light-guiding plate and forming bright lines. The reflected light that would otherwise be harmful is now absorbed and converted into heat, eliminating the bright line defect.
Solution Approach 2:
The patent introduces light-absorbing materials as intermediary elements between the reflective surfaces and the light-guiding plate. These materials act as mediators that intercept and absorb the reflected light rays, preventing them from causing bright lines while maintaining the overall structural simplicity of the backlight source.
2Object-affected harmful factors
If light-absorbing materials are added to eliminate bright lines, then image quality improves, but manufacturing complexity increases
Solution Approach 1:
The patent applies light-absorbing materials only in specific localized areas where reflected light rays are most problematic, rather than throughout the entire backlight structure. This selective application maintains image quality improvement while minimizing the increase in manufacturing complexity.
Solution Approach 2:
The patent uses composite structures combining light-guiding materials with light-absorbing materials in specific configurations. This allows the backlight source to maintain its light-guiding function while locally incorporating light-absorbing properties to eliminate bright lines, balancing performance improvement with manufacturing feasibility.
3Object-affected harmful factors
If the overlapping area of optical film material is increased to shield light rays, then bright lines are reduced, but the valid display area decreases
Solution Approach 1:
The patent extracts and removes the problematic reflected light rays from the system using light-absorbing materials positioned at strategic locations, rather than using large overlapping optical films. This extraction approach eliminates bright lines without sacrificing display area, as the light-absorbing materials occupy minimal space.
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 design effectively eliminates bright lines by reducing the amount of light rays reflected back into the light-guiding plate, maintaining a larger display area and enhancing image quality while accommodating narrow bezels in mobile devices.
Implementation Method 1
a first light-absorbing layer is formed on a surface on the side of the protrusion facing the back plate
Implementation Method 2
an angle between the inclined surface, and a part for forming the light-shielding groove, of the surface of the back plate facing the protrusion, is an obtuse angle, so that a part of the light rays exiting from the non-light-incidence side are reflected to the second light-absorbing layer
Data Source
AI summary
This disclosure relates to the field of display technologies, and discloses a backlight source and a display device, and the backlight source includes a back plate, a glue frame installed on the back plate, a light-guiding plate located in an accommodating space surrounded by the glue frame, and an optical film material located on the side of the light-guiding plate away from the back plate, and arranged overlapping with the light-guiding plate, wherein at least one of sides of the light-guiding plate is a light incidence side, and other sides are non-light-incidence sides; and at least one of the non-light-incidence sides, and the glue frame form together a light-eliminating structure configure to eliminate at least a part of light rays exiting from the non-light-incidence side.