Light Guide Plate Virtual Source Homogeneity
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Solution Overview
Problem
Existing light emission arrangements using multiple lenses and LEDs face issues such as individual LED recognition, high local luminosity, and non-uniform light distribution, which are not adequately addressed by assigning each LED to a separate lens.
Innovation Solution
The solution involves distributing and mixing light from multiple LEDs using light distribution means to create virtual light sources, which are then coupled into lenses with light decoupling structures on a light guide plate, allowing for more homogeneous light emission and avoiding high local luminosity by adapting the dimensions of virtual light sources to match lens entry areas, and using a grating to enhance light mixing and emission control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If each LED is individually assigned to a lens, then the light distribution can be controlled precisely, but the LEDs remain recognizable as individual light sources and produce high local luminous intensities
Solution Approach 1:
Multiple LEDs are merged into a common light guide plate, and multiple light entry areas of lenses are merged to share a common virtual light source. This combining approach distributes the light from multiple LEDs across multiple lens entry areas, preventing high local luminous intensity while maintaining precise light distribution control through the optical system.
Solution Approach 2:
A light guide plate is introduced as an intermediary between the LEDs and the lenses. The light guide plate receives light from multiple LEDs and distributes it to multiple light entry areas of lenses, creating virtual light sources. This intermediary component enables precise light distribution control while eliminating the direct one-to-one mapping that causes high local luminous intensity.
2Ease of operation
If each LED is individually assigned to a lens, then the light can be directed within a desired angular range, but the individual LED recognition and non-uniform light distribution occur
Solution Approach 1:
The patent merges multiple LEDs into a common light guide plate and merges multiple lens light entry areas to share common virtual light sources. This merging creates uniform light distribution across all lens areas while preserving the ability to control light direction within desired angular ranges through the optical design of the light guide plate and lens arrangement.
3Illumination intensity
If virtual light sources are created by distributing light from multiple LEDs, then light emission homogeneity is improved, but additional light distribution means are required
Solution Approach 1:
The light guide plate serves multiple functions simultaneously: it acts as a light distributor to create virtual light sources, provides structural support for the lens arrangement, and enables precise light direction control. This multi-functionality achieves improved light emission homogeneity without proportionally increasing device complexity, as a single component performs multiple critical roles.
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 approach results in improved light emission homogeneity, reduced local luminosity, and enhanced control over light distribution, enabling efficient illumination of workspaces or areas requiring high brightness while maintaining a pleasant appearance from various viewing angles.
Implementation Method 1
light is coupled laterally into a planar light guide and distributed along it
Implementation Method 2
The light is then emitted in a direction perpendicular to the light guide plate by means of so-called microlenses
Implementation Method 3
The light is then emitted in a direction perpendicular to the light guide plate by means of so-called microlenses
Implementation Method 4
light decoupling structures on a light guide plate, allowing for more homogeneous light emission and avoiding high local luminosity
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to an arrangement for emitting light having a planar arrangement of lenses (20), which each have a light entry region (21) and a light exit region (22); light sources in the form of LEDs (15), the light of which is emitted via the lenses (20); and light distribution means, which face the light entry regions (21) of the lenses (20) and which distribute the light emitted by the LEDs (15) and couple said light into the light entry regions (21) of the lenses (20).