Circular Light Guide Plate Lighting Device with Parallel LED Groups
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Solution Overview
Problem
In lighting devices for display devices, if one light source disconnects, all light sources are turned off, causing display failure and luminance unevenness.
Innovation Solution
A lighting device configuration with two types of light sources, where one is connected in series and the other in parallel to a different power supply, arranged alternately around a circular light guide plate, ensuring that disconnection of one light source does not turn off the entire system and reduces luminance unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If all light sources are connected in series to simplify power supply connection, then device complexity is reduced, but reliability deteriorates because disconnection of one light source turns off all light sources
Solution Approach 1:
The light sources are divided into multiple groups (first light sources and second light sources) that are connected in parallel to different power supplies. Each group can operate independently, so disconnection of one group does not affect the others. This segmentation resolves the contradiction by maintaining simple power supply connections within each group while ensuring system reliability through parallel group configuration.
2Manufacturing precision
If light sources are arranged uniformly around the light guide plate, then manufacturing precision is improved, but luminance uniformity deteriorates due to luminance unevenness in the display
Solution Approach 1:
Different groups of light sources (first and second light sources) are arranged at different positions around the light guide plate, with each group having specific angular intervals. This creates local variations in light source distribution that compensate for luminance unevenness, achieving overall luminance uniformity while maintaining manufacturing precision through standardized 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 minimizes the impact of light source disconnection on display performance, maintaining luminance consistency and preventing dark areas in the display.
Implementation Method 1
a light guide plate having a light exit surface having a substantially circular shape and a light entrance surface extending along an entire periphery of an outer edge of the light exit surface
Data Source
AI summary
A lighting device includes a light guide plate (14) having a light exit surface (14A) having a substantially circular shape and a light entrance surface (14C) extending along an entire periphery of an outer edge of the light exit surface (14A), an LED (31A) opposite the light entrance surface (14C), and an LED (32A) that is opposite the light entrance surface (14C) and is connected in parallel to the LED (31A) and the LED (32A) is arranged opposite from the LED (31A) with having a center (C1) of the light exit surface (14A) therebetween.