Light Guide Groove Structures for Backlight Luminance Uniformity
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Solution Overview
Problem
Conventional mix-type backlight modules suffer from uneven luminance due to corner dark areas, which affect the overall luminous uniformity.
Innovation Solution
A surface light source assembly is introduced, featuring a light guide plate with groove structures that reflect a portion of the light emitted from the light source outside the light emission angle range, improving luminance uniformity by redistributing light to dark areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a mix-type backlight module uses light guide plates to replace secondary lenses, then the overall thickness is reduced, but corner dark areas appear causing uneven luminance
Solution Approach 1:
The patent applies local quality by creating different surface structures at different locations on the light guide plate. Specifically, groove structures are formed at specific positions (such as corners and edges) where light distribution needs improvement, while other areas maintain their original smooth surface. This localized modification allows the light guide plate to redirect light preferentially to dark corner areas, improving luminance uniformity without changing the overall thin design.
Solution Approach 2:
The patent introduces a new dimensional approach by adding groove structures that create three-dimensional surface features on the light guide plate. These grooves form light-redirecting pathways that guide light from bright areas to dark corner areas, effectively using the vertical dimension of the groove depth to control light distribution in the horizontal plane, thereby improving luminance uniformity while maintaining the thin profile.
2Illumination intensity
If groove structures are added to the light guide plate, then luminance uniformity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by optimizing the groove structures with specific parameters including groove depth (D1), groove width, groove spacing, and groove patterns. By carefully controlling these parameters, the light redirecting effect is maximized to improve luminance uniformity. The parameters are designed to achieve the desired optical effect while remaining compatible with existing manufacturing capabilities, thus balancing performance improvement with manufacturing feasibility.
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 solution enhances luminance uniformity in backlight modules by uniformly emitting light from the light guide plate, reducing corner dark areas and improving the overall light emission profile.
Implementation Method 1
The light guide plate has a plurality of groove structures located within the light emission angle range of the light emitting surfaces to reflect a portion of a light emitted from the light emitting surfaces to outside the light emission angle range
Data Source
AI summary
A backlight module includes a plurality of surface light source assembly. Each surface light source assembly includes a light source with a plurality of light emitting surfaces having a light emission angle range each; a light guide plate with a bottom surface having a groove for receiving the light source, a light exit surface opposite to the bottom surface, and at least one side surface between the bottom surface and the light exit surface; and a plurality of groove structures configured to reflect a portion of a light emitted from the light emitting surfaces to outside their light emission angle range.