Display Device Light Guide Contact Portion Uniformity
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Solution Overview
Problem
In display devices with polymer dispersed liquid crystal layers, light emitted from multiple light sources does not sufficiently mix, leading to non-uniform brightness and darkness, potentially causing stripe-like visual recognition of brightness and darkness, which degrades display quality.
Innovation Solution
The display device incorporates a light-emitting module with multiple light sources and light guides arranged in specific configurations, where the light guides are in contact with each other and positioned to ensure even diffusion of light, with the contact portion equidistant from adjacent light-emitting points, preventing gaps that could reduce light utilization and cause luminance differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple light emitting elements are arranged spaced apart to provide illumination, then the light coverage area is improved, but the light mixing becomes insufficient leading to non-uniform brightness distribution
Solution Approach 1:
A light guide plate is introduced as an intermediary component between the spaced-apart light emitting elements and the display panel. The light guide plate receives light from multiple LED elements and redistributes it uniformly across the display area through internal reflection and diffusion, preventing direct visualization of individual light sources while maintaining broad coverage
Solution Approach 2:
The solution transitions from a one-dimensional arrangement of light sources to a two-dimensional light distribution system. The light guide plate spreads light in both lateral dimensions, converting point-source emission from spaced LEDs into a uniform areal illumination that covers the entire display surface
2Illumination intensity
If light guides are arranged in contact configuration to improve light mixing, then the light distribution uniformity is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The light guide plate employs an asymmetric thickness profile, being thicker at the light source side and thinner at the display side. This asymmetric design creates natural light diffusion gradients that compensate for minor positioning variations in the contact portions, reducing the impact of manufacturing tolerances on final uniformity
Solution Approach 2:
The invention modifies physical parameters of the light guide plate including varying thickness, refractive index gradients, and surface micro-structures. These parameter changes enable the system to achieve uniform light distribution through optical physics rather than relying solely on precise mechanical alignment of contact portions
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 suppresses the visual recognition of brightness and darkness non-uniformity, thereby improving display quality by ensuring uniform light distribution and reducing the risk of stripe-like artifacts.
Implementation Method 1
Light emitted from a plurality of light emitting elements arranged spaced apart propagates inside the light guide plate while diffusing
Implementation Method 2
a polymer dispersed liquid crystal layer as a light modulating layer. The light modulating element is disposed behind a light guide plate and scatters light incident from a side surface of the light guide plate
Data Source
AI summary
According to one embodiment, a display device includes a display panel and a light-emitting module. The light-emitting module includes a first light source having a first light-emitting point, a second light source having a second light-emitting point, a first light guide and a second light guide forming a contact portion in contact with the first light guide. The first light guide and the second light guide are arranged in a first direction, and a distance between the contact portion and the first light-emitting point along the first direction is equal to a distance between the contact portion and the second light-emitting point along the first direction.