Light Guide Thin Film Irregular Protrusion Alignment
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Solution Overview
Problem
Thinner light guide plates in display devices often develop irregular structures during manufacturing, which negatively impact light guiding effects, and existing micro or dot structures are ineffective in mitigating the influence of these irregular protrusions, especially when the height difference is significant relative to the plate's thickness.
Innovation Solution
A display device design featuring a light guide thin film with irregular protrusion structures and a light source that emits light parallel to the stripe feature direction of these protrusions, reducing the intensity and uniformity of light affected by the irregularities, with the light source's orientation determined by inspecting the film's surface using microscopes to optimize light beam direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the thickness of the light guide plate is reduced to achieve thinned and flexible display devices, then the display device becomes thinner and more flexible, but the irregular protrusion structures on the surface have a more significant negative impact on the light guiding effect
Solution Approach 1:
The patent changes the orientation parameter of the light source relative to the irregular structures. By aligning the light source parallel to the stripe feature direction of the irregular protrusions rather than perpendicular to it, the light guiding effect is improved despite the thin plate thickness. This parameter change allows the system to achieve both thinness and acceptable light guiding performance.
2Reliability
If dot structures or micro structures are added to the light guide plate to improve light guiding, then the light distribution is enhanced, but they cannot reduce or eliminate the influence of irregular protrusion structures
Solution Approach 1:
The patent extracts and addresses the specific problem of irregular protrusion structures by identifying their stripe feature direction and aligning the light source accordingly. Rather than adding more complex structures like dot patterns, the solution extracts the key characteristic (stripe direction) and uses it to optimize the light source orientation, achieving simplicity and effectiveness simultaneously.
3Illumination intensity
If the light source is oriented perpendicular to the stripe feature direction of irregular protrusions, then the light emitting area is maximized, but intense and non-uniform light is generated due to the irregular structures
Solution Approach 1:
The patent inverts the conventional approach by orienting the light source parallel to the stripe feature direction instead of perpendicular to it. This counterintuitive orientation reduces the impact of irregular protrusions and produces more uniform light, while still maintaining adequate light emission through the thin light guide plate.
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 minimizes the impact of irregular protrusions on light guiding by aligning the light beam with the protrusion structures, reducing intense and non-uniform light output, even when the height difference is substantial compared to the film's thickness.
Implementation Method 1
The light source is configured to emit a light beam traveling in a direction parallel with the stripe feature direction of the irregular protrusion structure
Data Source
AI summary
A display device includes a display panel, a front light module, and a cover structure. The front light module is located on the display panel. The front light module includes a light guide thin film and a light source. The light guide thin film has a thickness. The light guide thin film includes a top surface and an irregular protrusion structure located on the top surface. The irregular protrusion structure has a stripe feature direction in a plan view, and the irregular protrusion structure has a height difference. The light source is configured to emit a light beam traveling in a direction parallel with the stripe feature direction of the irregular protrusion structure. The cover structure is located on the front light module.