Curved Groove Light Guide Plate for Backlight Brightness
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Solution Overview
Problem
Conventional light source modules with microstructures on light guide plates suffer from light loss due to the destruction of total reflection, requiring additional optical films to direct light beams, which increases costs and reduces brightness.
Innovation Solution
A light guide plate with curved inclined reflective surfaces on its second surface, allowing light beams to be reflected towards a predetermined direction, potentially reducing or eliminating the need for optical films by enhancing optical efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If microstructures are disposed on the surface of the light guide plate to control light emission, then the light emission direction can be controlled, but the total reflection effect is destroyed and light loss occurs
Solution Approach 1:
The patent employs curved grooves with curved inclined reflective surfaces instead of flat microstructures. The curved geometry allows light to be reflected multiple times while maintaining total internal reflection, preventing light loss while still controlling emission direction. The curved surfaces guide light obliquely toward the upper surface without destroying the total reflection effect.
Solution Approach 2:
The patent introduces a vertical dimension by creating grooves that extend into the light guide plate material. This three-dimensional structure provides additional pathways for light reflection and control, allowing light to be directed toward the upper surface through multiple reflection angles without compromising total internal reflection.
2Illumination intensity
If a prism sheet is disposed on the upper surface of the light guide plate to direct light beams forward, then the light emission direction is improved, but light loss increases due to additional reflections and transmissions
Solution Approach 1:
The patent extracts and eliminates the need for separate prism sheets by integrating the light direction control function directly into the light guide plate structure through curved grooves. This integration removes the additional optical component that caused light loss while maintaining the desired forward emission direction.
Solution Approach 2:
The patent merges the functions of the light guide plate and the prism sheet into a single integrated structure. The curved grooves on the light guide plate perform both light guidance and light direction control, eliminating the need for separate optical components and reducing light loss.
3Illumination intensity
If additional optical films are used to direct light beams, then the light emission direction can be controlled, but the device complexity and costs increase
Solution Approach 1:
The light guide plate structure itself provides the light direction control function through its curved groove design, eliminating the need for separate optical films. The structure serves its own dual function of guiding and directing light without requiring additional components.
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 reduces light loss and costs by directing light beams efficiently, providing a smoother light distribution suitable for wide viewing angles and applications like liquid crystal display backlights.
Implementation Method 1
Each of the curved grooves has a curved inclined reflective surface and a curved light-back-surface connected to each other. The curved inclined reflective surface inclines with respect to the first surface. The curved inclined reflective surface is capable of reflecting the light beam from the light incident surface to the first surface.
Implementation Method 2
after the light beam emitted by the light emitting device is guided from a side surface of the light guide plate into the light guide plate, the light beam is totally reflected continually by the upper and lower surfaces of the light guide plate
Data Source
AI summary
A light guide plate includes a first surface, a second surface, at least a light incident surface, and a plurality of groove sets. The second surface is opposite to the first surface. The light incident surface connects the first surface and the second surface. The groove sets are separately disposed on the second surface. Each of the groove sets includes a plurality of curved grooves. Each of the curved grooves has a curved inclined reflective surface and a curved light-back-surface. The curved inclined reflective surface is inclined with respect to the first surface. The curved grooves of each of the groove sets curve towards a same curving direction. The curved inclined reflective surface of one of two curved grooves is connected to the curved light-back-surface of the other one of the two curved grooves. A backlight module is also provided.