Light Guide Plate Scattering Regions for Display Illumination
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Solution Overview
Problem
Conventional display apparatuses face issues with non-uniform brightness and the 'hot spot' phenomenon due to the need for additional light sources and light guide plate crowding, leading to space constraints and optical design inefficiencies, especially in transmissive and reflective display panels.
Innovation Solution
A display apparatus with a light guide plate featuring distinct first and second light scattering regions for the display and patterned regions, respectively, allowing for simultaneous illumination and reducing the hot spot phenomenon by extending the light mixing distance and improving light intensity distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an additional light source is used to illuminate the non-display area, then the non-display area receives sufficient illumination, but the light guide plate space is crowded and the display area may exhibit hot spot phenomenon
Solution Approach 1:
The light guide plate is segmented into multiple light scattering regions (first light scattering region for display area, second light scattering region for non-display area) with different optical properties. This segmentation allows each region to be optimized independently for its specific function, preventing the hot spot phenomenon while providing uniform illumination to both display and non-display areas.
Solution Approach 2:
Different regions of the light guide plate are assigned different local optical qualities through varying the light scattering layer configuration. The first light scattering region has different optical characteristics compared to the second light scattering region, allowing each area to have the precise light distribution properties needed for its specific purpose without interfering with other regions.
2Illumination intensity
If multiple light emitting diodes are arranged near the incident surface, then the display area is illuminated, but non-uniform light intensity distribution and hot spot phenomenon occur
Solution Approach 1:
A light scattering layer is introduced as an intermediary between the light emitting diodes and the display area. This light scattering layer diffuses the light from the point-source LEDs, transforming the concentrated light into a more uniform distribution across the display area, thereby eliminating the hot spot phenomenon caused by direct LED illumination.
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 enables efficient illumination of both display and patterned regions with reduced volume requirements and improved uniformity, minimizing the hot spot phenomenon and enhancing overall display quality.
Implementation Method 1
a light scattering layer, and a light absorbing layer. The optical microstructures are located on one of the first surface and the second surface of the light guide plate... a part of the light beam is scattered to the display region by the first light scattering region after entering the light guide plate
Data Source
AI summary
A display apparatus is provided. A display unit has a display region. A protecting cover has a patterned region, wherein the patterned region does not overlap the display region. A light guide plate is disposed between the display unit and the protecting cover and has a first light scattering region and a second light scattering region. The first light scattering region at least partially overlaps the display region, and the second light scattering region at least partially overlaps the patterned region. A light emitting unit emits a light beam to the light guide plate. After the light beam enters the light guide plate, a part of the light beam is scattered to the display region by the first light scattering region and another part of the light beam is scattered to the patterned region by the second light scattering region.