Light Guide Plate Lattice Design for Narrow Frame Displays
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Solution Overview
Problem
In electronic products with narrow frames, the edge reflective effect caused by the proximity of the light guide plate to the visible area results in a striking bright belt around the edge of the display, negatively impacting the display effect.
Innovation Solution
A light guide plate design featuring lattice regions on both the light-exiting and light-reflecting surfaces, where the second lattice portion on the light-exiting surface redirects light to the center, reducing peripheral brightness and improving display uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the light guide plate is positioned close to the visible area to achieve narrow frame design, then the frame width is reduced, but an edge reflective effect occurs causing a bright belt around the edge of the display
Solution Approach 1:
The patent applies different surface treatments to different regions of the light guide plate. Specifically, the peripheral portion of the light-exiting surface is left without lattice points to reduce light extraction in this region, while the central region maintains lattice points for normal light extraction. This local differentiation eliminates the bright belt effect at the edges while preserving display quality in the central visible area.
2Object-generated harmful factors
If light-absorbing processing is applied to the peripheral portion of the light-exiting surface to eliminate the bright belt, then the edge reflective effect is removed, but light losses occur reducing overall display efficiency
Solution Approach 1:
Instead of using light-absorbing materials that cause energy loss, the patent creates a local quality difference by simply not forming lattice points in the peripheral region. This allows light to remain trapped in the light guide plate through total internal reflection and be redirected to the central region, eliminating the bright belt without absorbing light energy.
Solution Approach 2:
The patent converts the potentially harmful edge reflection into a beneficial effect by allowing light that would have exited at the edge to instead be reflected back into the light guide plate and redirected to the central region. The peripheral region without lattice points acts as a mirror, converting what would be light loss into useful light delivery to the display area.
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
Effectively reduces the brightness of the peripheral portion of the light-exiting surface, enhancing the display effect by redirecting light to the center, thus eliminating the bright belt and improving overall display performance.
Implementation Method 1
the light, which is emitted by the LED light source 2, enters into the light guide plate main body through the first lateral surface 13 thereof, and refracts out through an edge of the light-exiting surface 12
Implementation Method 2
after the reflection of the second lateral surface 14 of the light guide plate main body
Data Source
AI summary
A light guide plate, a backlight module, and a display device are disclosed. The light guide plate includes a main body, which includes a light-reflecting surface and a light-exiting surface, a first lattice portion arranged on the light-reflecting surface, and a second lattice portion arranged on the light-exiting surface. The light-exiting surface includes a lattice region formed on a peripheral portion thereof, and a central light-exiting region that is surrounded by the lattice region. The second lattice portion covers the lattice region. According to the present disclosure, the brightness of the peripheral portion of the light-exiting surface can be reduced effectively, and thus the display effect of the electronic products including the light guide plate can be improved.