Surface Light Source Device with Partition Wall Cutouts for Luminance Uniformity
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Solution Overview
Problem
Existing surface light source devices for local dimming technologies face challenges in reducing unevenness of luminance at cell boundaries while minimizing power consumption, as they often require excessive light emission control and multiple light sources to be turned on.
Innovation Solution
A surface light source device comprising a light source substrate, a light guide plate, and a partition frame with a lattice-shaped partition wall that includes cutout portions, allowing for local adjustment of luminance and reducing the number of active light sources by enabling light sharing between adjacent cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light guide plate is divided into multiple cells with complete partition walls to prevent light leakage between cells, then luminance uniformity within each cell is improved, but luminance unevenness at boundary portions increases and power consumption increases
Solution Approach 1:
The partition wall is designed with different structures at different locations: the first partition wall has light blocking portions to prevent light leakage, while the second partition wall has light transmitting portions to allow light sharing between adjacent cells. This local differentiation resolves the contradiction by applying different optical properties to different regions of the partition wall.
Solution Approach 2:
Instead of completely blocking light at all partition walls, the invention applies partial light blocking only where necessary (first partition wall) while allowing light transmission in other areas (second partition wall). This partial action reduces power consumption by enabling light sharing while still maintaining luminance uniformity where needed.
2Object-generated harmful factors
If the partition wall is made opaque to prevent light emission from one cell to adjacent cells, then light leakage is suppressed, but luminance at boundary portions is reduced causing unevenness
Solution Approach 1:
The partition wall structure differentiates between light blocking portions and light transmitting portions at different locations. The light blocking portions prevent light leakage while the light transmitting portions maintain luminance at boundary portions, resolving the contradiction through spatial differentiation of optical properties.
Solution Approach 2:
The second partition wall with light transmitting portions acts as an intermediary that allows controlled light sharing between adjacent cells. This intermediary structure enables light to pass through selectively, preventing complete blockage while still suppressing excessive light leakage.
3Illumination intensity
If multiple light sources are turned on in each cell to ensure sufficient luminance, then luminance uniformity is maintained, but power consumption increases
Solution Approach 1:
Adjacent cells share light through the light transmitting portions of the partition walls, effectively merging the optical fields of neighboring cells. This allows a single light source in one cell to contribute luminance to adjacent cells, reducing the total number of active light sources needed and thereby reducing power consumption.
Solution Approach 2:
Light emitted from a light source serves multiple functions: it illuminates the originating cell and simultaneously contributes to illuminating adjacent cells through light sharing. This multi-functionality reduces the need for separate light sources in each cell, lowering overall power consumption.
4Ease of manufacture
If the partition wall is made thin to reduce manufacturing complexity, then manufacturing ease is improved, but structural strength and light blocking performance deteriorate
Solution Approach 1:
The partition wall is segmented into multiple functional portions: light blocking portions and light transmitting portions. This segmentation allows each portion to be optimized for its specific function while maintaining overall structural integrity, balancing manufacturing ease with structural strength and optical performance.
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 effectively reduces luminance unevenness at cell boundaries and minimizes power consumption by allowing cells with different luminance requirements to share light, thereby reducing the number of active light sources needed.
Implementation Method 1
The light guide plate is provided on the light source substrate and emits, from a specific emission surface, light entered from the plurality of light sources
Data Source
AI summary
A surface light source device includes a light source substrate in which a plurality of light sources capable of being driven independently of one another are disposed, a light guide plate provided on the light source substrate to emit, from a specific emission surface, light entered from the plurality of light sources, and a partition frame having a partition wall for dividing the light guide plate into a plurality of cells. The partition wall of the partition frame partially has cutout portions. The light guide plate is connected between adjacent cells through the cutout portions of the partition wall.