Light-Guide Plate Inserting Portion for LED Light Leakage Control
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Solution Overview
Problem
Conventional light-guide plates in LCD devices suffer from light leakage due to manufacturing tolerances, leading to reduced optical efficiency and display quality, as the gap between the LED and the light-guide plate is often larger than designed, causing some light to escape instead of being directed to the LCD panel.
Innovation Solution
A light-guide plate with inserting portions that match the size and shape of the LEDs, allowing them to be securely fixed, reducing the gap and preventing light leakage, and incorporating a reflecting plate and optical members to enhance brightness and optical efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a gap is designed between the LED and the light-guide plate to prevent light leakage, then light leakage is reduced, but manufacturing tolerance causes the gap to become larger, resulting in increased light leakage
Solution Approach 1:
A gap filling material is introduced as an intermediary substance between the LED and the light-guide plate. This material fills the gap created by manufacturing tolerances, ensuring intimate contact between the LED and light-guide plate without requiring precise gap control, thereby preventing light leakage while accommodating manufacturing variations
Solution Approach 2:
The optical properties of the gap region are changed by introducing a material with specific refractive index and optical characteristics. This parameter change ensures that light is properly coupled from the LED into the light-guide plate, preventing leakage while maintaining compatibility with standard manufacturing tolerances
2Loss of energy
If the gap between the LED and the light-guide plate is made smaller to improve optical efficiency, then light transmission is improved, but manufacturing tolerance causes the gap to become larger, reducing optical efficiency
Solution Approach 1:
The gap filling material serves as a mediator that maintains a consistent optical interface between the LED and light-guide plate despite manufacturing tolerances. This intermediary ensures optimal light coupling and transmission efficiency without requiring ultra-precise gap control, thereby maintaining high optical efficiency while accommodating normal manufacturing variations
Solution Approach 2:
The gap filling material is installed beforehand to compensate for and cushion against the effects of manufacturing tolerances. This pre-compensation ensures that even when the actual gap deviates from the ideal dimension due to manufacturing variations, the optical efficiency is maintained at high levels
3Stability of the object's composition
If the LED is securely fixed to the light-guide plate to maintain position, then brightness deviation is reduced, but the structure becomes more complex
Solution Approach 1:
The gap filling material simultaneously serves multiple functions: it fills the gap, provides optical coupling, and acts as an adhesive to secure the LED to the light-guide plate. By merging these functions into a single material and step, the structure remains simple while achieving stable LED positioning without requiring separate fixing 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 improves optical efficiency by ensuring all light from the LEDs is directed to the LCD panel, reducing brightness deviations and enhancing display quality by minimizing light leakage and maintaining the LEDs' position, thus improving the overall brightness and image quality of the LCD device.
Implementation Method 1
a light-guide plate for guiding light that is provided from the light source toward the LCD panel
Implementation Method 2
A light-diffusing pattern may be formed at a side surface of the inserting portion
Data Source
AI summary
A light-guide plate includes a body for guiding incident light, and at least an inserting portion penetrating a portion of the body, wherein at least a light source for providing the light-guide plate with the light is inserted into the inserting portion. The inserting portion can be formed at an end portion of the body. A side surface of the body can be recessed to form the inserting portion. A light-diffusing pattern can be formed at a side surface of the inserting portion, and the side surface of the inserting portion is substantially parallel with the side surface of the body.