Backlight Module Refractive Surface for Borderless Display
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Solution Overview
Problem
Existing backlight modules suffer from edge light leakage, which affects picture brightness and cannot be effectively mitigated without compromising overall brightness or border size, especially in portable electronic devices with shrinking screen borders.
Innovation Solution
A backlight module design featuring a light guide plate with a refractive surface and a diffusion film where the outer edge of the refractive surface is farther from the light guide incident surface than the inner edge, forming an inclined bonding surface that creates a dark area to prevent light leakage, allowing for a borderless design by altering the light path direction and reducing overflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fit clearance is reserved between the light guide plate and border of the backlight module, then assembly is easier, but light leakage occurs at the clearance edge
Solution Approach 1:
A sealing strip is introduced as an intermediary component between the light guide plate and the border. The sealing strip fills the fit clearance and prevents light leakage while maintaining the assembly ease benefit of the clearance design.
Solution Approach 2:
The border shading function is extracted and transferred to a dedicated sealing strip component. This allows the border to focus on structural support while the sealing strip specifically addresses the light leakage problem at the clearance.
2Object-generated harmful factors
If the border is enlarged to avoid light leakage, then light leakage is reduced, but the screen border size increases
Solution Approach 1:
Instead of uniformly enlarging the entire border, the sealing strip is applied locally at the critical clearance region between the light guide plate and border. This provides light leakage prevention exactly where needed without increasing the overall border area.
3Object-generated harmful factors
If the border is prepared from a black material, then light leakage is reduced by avoiding light reflection, but the overall brightness of the backlight module is greatly lowered
Solution Approach 1:
The black material is applied locally only to the sealing strip at the clearance region rather than the entire border. This provides light leakage prevention through reflection blocking only where needed, while the rest of the backlight module maintains high brightness.
Solution Approach 2:
The sealing strip acts as an intermediary that selectively blocks light reflection at the clearance without affecting the overall light output. It mediates between the need to prevent light leakage and the need to maintain brightness.
4Object-generated harmful factors
If a sealing strip is used to prevent light leakage, then light leakage is reduced, but restrictions on the sealing strip design are imposed
Solution Approach 1:
The sealing strip is designed as a composite structure combining black light-blocking material with adhesive properties. This integrates multiple functions (light leakage prevention, structural bonding, clearance filling) into a single component, reducing design constraints.
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
This design effectively reduces light leakage, maintains overall brightness, and eliminates restrictions on sealing strips and border shading, enabling a borderless display device with uniform light distribution.
Implementation Method 1
a peripheral edge of the light guide emergent surface being a refractive surface
Data Source
AI summary
The present application relates to a backlight module and a display device. The backlight module includes a light source, a light guide plate, and a diffusion film; the light guide plate includes a light guide incident surface facing the light source and a light guide emergent surface facing a light emitting direction, a peripheral edge of the light guide emergent surface is a refractive surface, and a distance from an outer edge of the refractive surface to the light guide incident surface is longer than a distance from an inner edge of the refractive surface to the light guide incident surface; and the diffusion film includes a diffusion incident surface and a diffusion emergent surface, and a shape of the diffusion incident surface is fitted to a shape of the light guide emergent surface. The direction and strength distribution of an emitting light path can be changed, and light leakage caused by ray overflow from a backplane due to ray concentration on the edge can be reduced. Moreover, by such a design, restrictions on a sealing strip and a border shading function can be eliminated, and technical support for “borderlessness” can be provided.