Light Guide Plate Edge Reflection for Narrow Backlight Frames
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Solution Overview
Problem
Edge light-type backlight devices suffer from light leakage through the opposite edge surface of the light guide plate, leading to reduced brightness and increased frame width due to the need for a wide light blocking layer.
Innovation Solution
A lighting device with a light guide plate and a light reflecting portion on the opposite edge surface to reflect light back into the plate, reducing leakage and allowing for a narrower frame width by minimizing the light blocking layer's width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a wide light blocking layer is used to block light leaking through the opposite edge surface, then brightness uniformity is improved, but frame width increases
Solution Approach 1:
The invention converts the harmful light leakage through the opposite edge surface into a beneficial effect by applying a light reflecting portion to the opposite edge surface. The reflected light is redirected back into the light guide plate, where it can exit through the light exit surface, thereby improving brightness uniformity without requiring a wide light blocking layer, thus maintaining a narrow frame width.
2Length of stationary object
If the frame width is reduced, then device thickness is improved, but light leakage control becomes more difficult
Solution Approach 1:
The invention applies a light reflecting portion specifically to the opposite edge surface of the light guide plate, creating a localized functional modification. This targeted approach allows for precise control of light leakage at the critical location without requiring changes to the overall frame structure, enabling narrow frame width while maintaining effective light leakage control.
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 reduces light leakage and maintains brightness while minimizing the frame width by using a light reflecting portion on the light guide plate's opposite edge surface, enhancing the performance of edge light-type backlight devices.
Implementation Method 1
The light reflecting portion is disposed on at least the opposite edge surface and reflects light travelling within the light guide plate toward the opposite edge surface
Data Source
AI summary
A backlight device 13 includes LEDs 22, a light guide plate 24, and a light reflecting portion 34. The light guide plate 24 is a plate member and includes a light entrance surface 24a, an opposite edge surface 24d, and a light exit surface 24b. The light entrance surface 24a is an edge surface of the plate member and opposite the LEDs 22 and light emitted by the LEDs 22 enters the light guide plate 24 through the light entrance surface. The opposite edge surface 24d is another edge surface of the plate member that is on an opposite side from the light entrance surface 24a. The light exit surface 24b is a plate surface of the plate member and the light entering through the light entrance surface 24a exits the light guide plate 24 through the light exit surface. The light reflecting portion 34 is disposed on at least the opposite edge surface 24d and reflecting light travelling within the light guide plate 24 toward the opposite edge surface 24d.