Spread Illuminator Light-Reflecting Member Circuit Board
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Solution Overview
Problem
Conventional sidelight-type spread illuminating apparatuses experience light leakage due to the absorption of light by the circuit board, leading to reduced brightness and uniformity of illumination, especially when the thickness of the light guide plate is minimized.
Innovation Solution
A spread illuminating apparatus with a light-reflecting member on the circuit board, where the light-reflecting member extends forward and rearward from the center of the light-emitting surface to reflect light entering the gap between the light-emitting surface and the incident light surface, and a pedestal with inclined surfaces to guide light efficiently into the light guide plate, reducing absorption and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the circuit board is tightly fixed to the inclined surface of the light guide plate to fix LED positioning, then the positioning stability is improved, but light leakage increases and brightness decreases
Solution Approach 1:
A light-reflecting member is introduced as an intermediary between the circuit board and the light guide plate. This member reflects light that would otherwise leak through the circuit board back into the light guide plate, thereby maintaining positioning stability while improving brightness and reducing light leakage.
2Length of stationary object
If the light guide plate thickness is minimized to achieve thinner display devices, then the device thickness is reduced, but light leakage through the circuit board increases
Solution Approach 1:
The light leakage that occurs when the light guide plate is thinned is converted into a beneficial effect by using a light-reflecting member to redirect the leaked light back into the light guide plate. This transforms the harmful light loss into useful illumination, allowing thin design without sacrificing brightness.
3Ease of manufacture
If the LED light-emitting surface is not parallel to the incident light surface due to circuit board fixation, then the positioning is simplified, but light entry efficiency decreases
Solution Approach 1:
The light-reflecting member serves as a mediator that compensates for the non-parallel arrangement. It reflects light from the LED onto the incident light surface of the light guide plate, maintaining efficient light entry even when the LED surface is not perfectly parallel due to simplified positioning.
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 configuration increases the brightness and uniformity of illumination by minimizing light leakage and ensuring efficient light introduction into the light guide plate, even with thinner light guide plates.
Implementation Method 1
a light-reflecting member on the circuit board, where the light-reflecting member extends forward and rearward from the center of the light-emitting surface to reflect light entering the gap between the light-emitting surface and the incident light surface
Implementation Method 2
a pedestal with inclined surfaces to guide light efficiently into the light guide plate
Data Source
AI summary
A spread illuminating apparatus includes a point light source with a light-emitting surface, a circuit board with a mounting surface on which the point light source is mounted, and a light guide plate with an incident light surface and an emitting surface. The circuit board is arranged as that at least a partial portion of the circuit board extends beyond an area where the point light source is mounted so as to be superposed on the light guide plate, a light-reflecting member is arranged on the mounting surface, and a region of the mounting surface in which the light-reflecting member is arranged includes a first region that extends forward from a position corresponding to the center of the light-emitting surface of the point light source.