Backlight Module Annular Light-Shielding Structure for Perforated Displays
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Solution Overview
Problem
Perforated screens in mobile devices suffer from a bright band or edge effect around camera holes due to light reflection, which is difficult to mitigate without increasing costs by blackening the iron plate, leading to suboptimal display effects.
Innovation Solution
A backlight module design featuring a light guide plate, optical component with an inclined side end surface, and an annular light-shielding structure around the hole, which reduces light reflection and absorption, preventing bright edges by using an annular light-shielding tape and potentially a light-absorbing material on the side wall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a perforated screen is used to improve screen-to-body ratio, then the screen ratio is improved, but a bright band or edge effect appears around camera holes due to light reflection
Solution Approach 1:
The patent converts the harmful light reflection into a beneficial effect by using a light-shielding structure that redirects reflected light away from the display area. The side wall reflects light that would otherwise create bright edges, redirecting it to illuminate the display panel uniformly, thus converting the harmful reflection into useful illumination.
Solution Approach 2:
The light-shielding structure with a side wall acts as an intermediary element between the hole and the display area. It intercepts reflected light and redirects it, preventing the bright edge effect while maintaining the perforated screen design. The side wall serves as a mediator that transforms the light path to eliminate the harmful effect.
2Object-generated harmful factors
If the iron plate is blackened to reduce light reflection, then the bright edge effect is reduced, but the manufacturing cost increases
Solution Approach 1:
The patent uses a cost-effective light-shielding structure made from simple materials such as a bent back plate or adhesive tape instead of expensive blackening processes. This disposable-like approach uses inexpensive components to achieve the light-shielding effect, significantly reducing manufacturing costs while maintaining effectiveness.
Solution Approach 2:
The patent changes the geometric parameters of the back plate by bending it to form a side wall, or by adding a simple light-shielding tape, rather than changing the material properties through expensive blackening processes. This parameter change (shape modification) achieves the same light-shielding effect at lower cost.
3Object-generated harmful factors
If a light-shielding structure is added to prevent bright edges, then the display quality is improved, but the device complexity increases
Solution Approach 1:
The light-shielding structure serves multiple functions: it blocks light reflection to prevent bright edges, redirects light to improve display uniformity, and can be integrated with existing back plate structures. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent merges the light-shielding function with the existing back plate structure by bending part of the back plate to form a side wall, or by integrating the light-shielding tape with the hole structure. This merging approach combines multiple functions into a single integrated structure, minimizing the increase in device complexity.
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 minimizes the bright edge phenomenon around camera holes, enhancing display quality without increasing production costs by using an inclined optical component and light-shielding tape, ensuring uniform illumination and improved display effects.
Implementation Method 1
a light guide plate, wherein at least one side surface of the light guide plate is a light incident surface, the light incident surface is close to the light source unit, and the light guide plate is configured to guide the light to a display panel
Implementation Method 2
a light guide plate, wherein at least one side surface of the light guide plate is a light incident surface
Implementation Method 3
an optical component, attached to a light-exiting surface of the light guide plate and configured to uniformly irradiate the display panel with the light
Implementation Method 4
an optical component, attached to a light-exiting surface of the light guide plate and configured to uniformly irradiate the display panel with the light
Implementation Method 5
a side surface of the side wall that is close to the light guide plate is coated with a light absorbing material
Implementation Method 6
a bright band or edge effect around camera holes due to light reflection
Data Source
AI summary
A backlight module and a display device are provided. The backlight module includes: a light source unit; a light guide plate, for guiding light to a display panel; an optical component for uniformly irradiating the display panel; and a back plate, at least including a bottom plate, for accommodating the light guide plate, the light source unit, and the optical component. The light guide plate and the optical component are provided with a hole penetrating through the two, a part of the back plate at the hole is bent and inserted into the hole to form a side wall, a side end surface of the optical component close to the hole is inclined regarding an axis of the hole, and an annular light-shielding structure is around a top surface of the hole.