Light Guide Plate Asymmetric Microstructures Dark State Stripe Elimination
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Solution Overview
Problem
Display devices with reflective panels and light guide plates experience degradation in display quality due to stripe patterns formed by reflected light in dark states, caused by multi-layer material interfaces.
Innovation Solution
A display device design incorporating a light guide plate with microstructures on the top surface and lenticular structures on the bottom surface, along with optical adhesive layers of lower refractive index, which are integrally formed and arranged to reduce the consistency of reflected light travel direction, enhancing color saturation and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If microstructures are formed on the top surface of the light guide plate to increase light guide effect, then color saturation is improved, but stripe patterns are formed on the display screen in dark state
Solution Approach 1:
The patent employs asymmetric microstructures on the top surface of the light guide plate, where the microstructures have different shapes or orientations in different regions. This asymmetry disrupts the formation of periodic stripe patterns while maintaining effective light guidance, thereby improving color saturation without causing display defects in dark states.
Solution Approach 2:
The patent applies different microstructure designs to different local regions of the light guide plate. By optimizing the microstructure parameters (such as size, shape, or density) in specific areas, the light guide effect is enhanced where needed while minimizing stripe pattern formation in critical display regions.
2Object-affected harmful factors
If lenticular structures are added on the bottom surface to disperse reflected light, then stripe patterns are eliminated, but device complexity increases
Solution Approach 1:
The patent combines the lenticular structures on the bottom surface with the microstructures on the top surface into an integrated light guide plate design. By merging these two functional elements into a single component, the patent eliminates stripe patterns through effective light dispersion while avoiding the complexity of separate assemblies or additional layers.
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 disperses reflected light, eliminating ray-like textures in dark states and improving display quality by ensuring incident light enters perpendicularly, while the refractive index difference between layers enhances color saturation.
Implementation Method 1
A refractive index of the first optical adhesive layer is lower than a refractive index of the light guide plate
Implementation Method 2
the reflected light generated when the light passes through the multi-layer material interface to form stripe patterns
Implementation Method 3
makes the incident light enter the reflective display panel nearly perpendicularly through the asymmetric microstructures on the top surface of the light guide plate and the lenticular structures on the bottom surface
Data Source
AI summary
A display device includes a reflective display panel, a light guide plate, a light source, and a first optical adhesive layer. The light guide plate is located on the reflective display device. The light guide plate has a top surface, a bottom surface and a light incident surface connecting the top surface and the bottom surface. The light guide plate further includes multiple microstructures located on the top surface and multiple lenticular structures located on the bottom surface. The light source faces the light incident surface of the light guide plate. The first optical adhesive layer is located below the light guide plate and in contact with the lenticular structure. A refractive index of the first optical adhesive layer is lower than a refractive index of the light guide plate.