Planar Light Source Switching Layout for Uniform Luminance
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Solution Overview
Problem
Planar light sources with light-emitting elements like LEDs often experience non-uniform luminance due to varying distances and numbers of adjacent light sources, leading to uneven illumination across the emitting surface.
Innovation Solution
A light-emitting module configuration where light sources in two regions are alternately lit with different current durations to balance luminance, with the first region having more adjacent light sources and thus higher luminance, and the second region having fewer adjacent light sources and lower luminance, using a switching circuit to adjust the polarity and duration of the drive power source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If light sources are arranged in a two-dimensional planar configuration, then the light-emitting surface area is increased, but the luminance uniformity deteriorates due to varying distances and numbers of adjacent light sources
Solution Approach 1:
The light-emitting surface is divided into multiple regions (first region with higher luminance and second region with lower luminance) based on the number of adjacent light sources. Each region is independently controlled by assigning different current durations to light sources in different regions, thereby achieving uniform overall luminance while maintaining a large light-emitting surface area
Solution Approach 2:
Different current durations are applied to light sources depending on their local position and the number of adjacent light sources. Light sources in the first region (with more adjacent light sources) are controlled with shorter current durations, while light sources in the second region (with fewer adjacent light sources) are controlled with longer current durations, creating local quality differences that result in uniform global luminance
2Ease of operation
If all light sources emit light simultaneously with the same current duration, then the device operation is simplified, but the luminance uniformity across the light-emitting surface deteriorates
Solution Approach 1:
The light sources are driven in a periodic alternating manner where the polarity of the drive power source is switched between first and second time periods. During the first time period, light sources in the first region emit light with a first current duration while light sources in the second region do not emit light. During the second time period, the roles are reversed. This periodic action achieves luminance uniformity while maintaining relatively simple device operation
Solution Approach 2:
The current duration for each light source is dynamically adjusted based on its region. Instead of using a fixed current duration for all light sources, the system dynamically changes the current duration according to the region (first region uses first current duration, second region uses second current duration), thereby achieving luminance uniformity while keeping the control mechanism relatively simple
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 achieves more uniform luminance across the entire light-emitting surface by independently controlling the light sources in each region, reducing unevenness and enhancing overall illumination consistency.
Implementation Method 1
a first light source, a second light source, and a third light source... Each light source emits light in response to application of current
Data Source
AI summary
A light-emitting module includes a first terminal, a second terminal, a first light source, a second light source, and a third light source. The first light source is connected between the first terminal and the second terminal. The second light source and the third light source are connected between the first terminal and the second terminal, in anti-parallel with the first light source. The first, second, and third light sources are aligned in a first direction along a light-emitting surface, with the first light source between the second light source and the third light source.