LED Reflective Panel for Uniform Illumination on Display Boards
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Solution Overview
Problem
Conventional LED-based information display boards suffer from non-uniform lighting distribution and high glare levels, leading to discomfort and poor legibility, especially in applications like traffic signs where point light sources create multiple spaced light spots rather than continuous messages.
Innovation Solution
The use of light-extending light sources comprising a light emitting diode (LED) with a packaging lens and a reflective panel that directs light emission towards both the front and back sides of the display board, creating an expanded illuminated area for improved illuminance and legibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional through-hole LEDs are used as light sources, then the device complexity is low and manufacturing cost is reduced, but the illumination uniformity deteriorates and glare increases
Solution Approach 1:
The patent introduces a reflective panel positioned at the backside of the LED to reflect light toward the front illuminated area. This adds a new spatial dimension (backside reflection) to the light distribution, transforming the single-direction front illumination into a multi-directional illumination pattern that overlaps front and back illuminated areas to achieve more uniform lighting distribution across the display board.
Solution Approach 2:
The reflective panel serves as an intermediary element between the LED light source and the display board. It mediates the light distribution by capturing light from the LED and redirecting it to enhance the front illuminated area, thereby improving overall illumination uniformity without requiring changes to the LED structure itself.
2Area of stationary object
If conventional LEDs with small front illuminated area are used, then the light source size is reduced, but the legibility and visual comfort of displayed information deteriorate
Solution Approach 1:
The patent merges the front illuminated area and back illuminated area by using the reflective panel to redirect light from the backside to the front. This combining of two illuminated areas creates an expanded effective illuminated area that enhances the visibility and legibility of displayed information while maintaining a compact LED structure.
Solution Approach 2:
By utilizing the backside of the LED for light emission and reflection, the patent effectively doubles the useful illuminated area in the front viewing direction. This dimensional exploitation (using both front and back sides) increases the effective illuminated area without increasing the physical size of the LED component.
3Ease of manufacture
If conventional LEDs cause infinite contrast and glare, then the manufacturing cost is reduced, but the visual comfort and discomfort in use increase
Solution Approach 1:
The reflective panel is strategically positioned and angled to control light distribution in specific directions. By adjusting the local optical properties and geometry of the reflective panel, the system directs light uniformly across the display board while avoiding concentrated glare spots, thus reducing harmful glare effects without compromising manufacturing simplicity.
4Device complexity
If point light sources are arranged to form messages, then the device complexity is low, but the continuity and comfort of displayed information deteriorate
Solution Approach 1:
The reflective panel creates continuous light distribution by reflecting light from each LED to fill gaps between adjacent LED illuminated areas. This ensures continuous illumination across the entire message display area, eliminating the discontinuous spotted effect of conventional point light source arrangements and providing smooth, continuous visual information.
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 solution enhances illumination efficiency, provides better continuous lighting, and improves the comfort and clarity of message recognition on display boards by increasing both the illuminance and illuminated area, allowing for clearer and more comfortable reading of information.
Implementation Method 1
a reflective panel that is disposed on the light emitting side of the LED and located adjacent to the packaging lens; wherein a part of light emitted from the light emitting side is reflected by the reflective panel toward the display board at the backside of the LED
Data Source
AI summary
An information display board with improved display performance by light-extending light sources is revealed. The information display board includes a display board and a plurality of light-extending light sources each of which consists of a light emitting diode (LED) and a reflective panel. The LED has a light emitting side and a backside while the reflective panel is disposed on the light emitting side of the LED for reflecting a part of light emitted from the light emitting side to the display board on the backside to form an expanded area. Thus illuminance and illuminated area of information shown on the display board are increased. By continuous lighting generated, messages/information shown on the information display board such as traffic sign can be read more clearly and comfortably.