Light Source Device Radial Intensity Zones Shadow Reduction
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Solution Overview
Problem
In display technologies, the use of LEDs in a matrix form often results in shadows between cross-pitches or at corners, degrading display quality due to non-uniform light distribution.
Innovation Solution
A light source device with a specific light field shape is designed, featuring a light field center surrounded by radially arranged intense, moderate, and dim light regions, with the light source devices positioned on a backlight module in a matrix form to minimize shadows and enhance optical uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If LEDs are arranged in a matrix form to achieve compact display structure, then device miniaturization is improved, but shadow formation between cross-pitches and at corners occurs, degrading display quality
Solution Approach 1:
The light field of each LED is segmented into multiple intensity zones (first light field with higher intensity, second light field with lower intensity) to create a gradient distribution pattern. This segmentation allows the light to transition smoothly between adjacent LEDs, reducing shadow formation while maintaining compact matrix arrangement.
Solution Approach 2:
Different regions of the light field are assigned different quality characteristics - the center region (first light field) has higher intensity while the peripheral regions (second light field) have lower intensity. This local quality differentiation ensures that adjacent LEDs do not create harsh shadows at their boundaries, improving overall display uniformity.
2Illumination intensity
If secondary optical design is applied to LEDs to achieve specific light characteristics, then light field control is improved, but device complexity increases due to additional lenses and optical elements
Solution Approach 1:
The patent merges the light field shaping function directly into the LED emission characteristics by creating a specific light field pattern (first and second light fields with different intensities) rather than using separate optical elements. This integration achieves precise light distribution control without adding complex lens systems or additional optical components.
Data Source
AI summary
The present invention discloses a light source device applied to a display module. The light source device produces an emission light field which forms a light field shape when projected in a normal direction onto a planar surface substantially parallel to a placement plane of the light source device. The light field shape includes a light field center, more than three intense light regions, and more than three dim light regions. The intense light regions and the dim light regions are alternately disposed, and radially arranged around the light field center. A light brightness at a predetermined distance from the light field center in the dim light region is less than 90% of a light brightness at the predetermined distance from the light field center in the intense light region.