Surface Emitting Light Source Wall Height Design
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Solution Overview
Problem
Surface-emitting light sources experience sudden luminance changes due to light leakage from active to adjacent inactive light-emitting regions, causing unclear displays in devices like personal computers and tablets.
Innovation Solution
A surface-emitting light source design featuring light-emitting regions with a light-guide portion and a light-reflective member having unit first wall portions with a central portion of reduced height compared to end portions, minimizing light leakage and maintaining uniform luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a light-reflective member with uniform height walls is used, then light reflection efficiency is improved, but light leakage to adjacent regions increases causing sudden luminance change
Solution Approach 1:
The light-reflective member employs a non-uniform wall height design where the central portion has a different height than the end portions. This local variation in geometry allows the central region to reflect light back into the active light-emitting region while the reduced-height end portions minimize light leakage into adjacent inactive regions, thus resolving the contradiction between reflection efficiency and light leakage prevention.
Solution Approach 2:
The light-reflective member is segmented into distinct height zones: a central portion with one height and end portions with another height. This segmentation allows different regions of the same component to perform different functions - the central portion maximizes light reflection while the end portions control light leakage, thereby solving the technical contradiction.
2Measurement precision
If grooves with reflective layers are formed at outer edges of light-emitting regions, then contrast ratio is maintained, but light leakage between regions still occurs due to total reflection at light guide plate surface
Solution Approach 1:
The light-reflective member acts as an intermediary component between the light guide plate and the external environment. By positioning this reflective structure at the outer edges of light-emitting regions with varied wall heights, it mediates the light paths - maintaining contrast ratio through the reflective layer in grooves while the specific geometry controls total reflection effects to prevent light leakage into adjacent regions.
3Area of stationary object
If light-emitting regions are arranged adjacently for compact design, then device area is reduced, but light leakage between adjacent regions causes unclear display
Solution Approach 1:
The light-reflective member uses local quality variation with different wall heights at different locations. The central portion's height is optimized for light reflection within active regions, while the end portions' reduced height specifically addresses light leakage control at the boundaries between adjacent light-emitting regions, enabling compact arrangement without display degradation.
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
The design effectively reduces light leakage between adjacent regions, preventing sudden luminance changes and enhancing display clarity by ensuring consistent illumination.
Implementation Method 1
a light-reflective member disposed below the light-guide portion. The light-reflective member has a first wall portion disposed at an outer periphery of each of the plurality of light-emitting regions
Implementation Method 2
due to total reflection at the upper surface of the light guide plate, some components of the light may enter into adjacent light-emitting regions
Data Source
AI summary
A surface-emitting light source includes a plurality of light-emitting regions each of which includes light sources, wherein each of the plurality of light-emitting regions can be turned on individually. Each of the light-emitting regions is adjacent to each other and includes a light-guide portion that is provided in adjacent light-emitting regions and covers the light sources, and a light-reflective member disposed below the light-guide portion. The light-reflective member has a first wall portion disposed at the outer periphery of each of the light-emitting regions. The first wall portion includes one or more unit first wall portions each of which corresponds to a respective one of the light sources located at the outer periphery of each of the light-emitting regions. The unit first wall portion located at the two adjacent light-emitting regions has a central portion having a height smaller than a height of both end portions.