Cover Reflective Layer Layout for Stray-Light Display Contrast
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Solution Overview
Problem
Conventional reflective or transflective display apparatuses suffer from poor display contrast and color performance due to stray light formation caused by the air gap between the protective cover and light guide plate, leading to a decline in image clarity.
Innovation Solution
A display apparatus design featuring a reflective layer between the light source and cover, along with a reflective sheet and diffusion or refractive layers, which suppresses stray light and enhances light distribution, combined with a light absorbing layer to define the display area and improve illumination uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective cover is affixed on the side of the light guide plate to protect the front light module, then the front light module is protected, but stray light forms due to the air gap between the protective cover and light guide plate, leading to poor display contrast and color performance
Solution Approach 1:
A reflective layer is introduced as an intermediary component between the protective cover and the light guide plate. This reflective layer serves dual functions: it maintains the protective air gap structure while reflecting stray light back toward the display panel, thereby eliminating the harmful effect of the air gap without compromising the protection function
Solution Approach 2:
The air gap that originally caused stray light problems is retained for protection purposes, but the reflective layer converts the harmful stray light into beneficial reflected light that enhances display quality. The previously harmful reflection off the air gap is transformed into controlled, useful light reflection
2Illumination intensity
If the light source is disposed adjacent to the cover to meet illumination requirements, then illumination is provided, but stray light is generated on the surface of the light guide plate
Solution Approach 1:
The reflective layer is strategically positioned at specific locations where stray light generation is most problematic, such as along the edges and surfaces near the light source. This localized application of reflectivity addresses stray light issues at their source while maintaining overall illumination quality
Solution Approach 2:
The reflective layer acts as an intermediary between the light source and the surrounding structures, capturing stray light that would otherwise escape or create glare and redirecting it toward the display panel, thereby converting potential harm into useful 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 effectively maintains display quality by reducing stray light and enhancing brightness uniformity, thus improving contrast and color performance while meeting illumination requirements.
Implementation Method 1
a reflective layer is disposed on a first surface of the cover facing the frame, and is located between the light source and the cover. The reflective layer extends between the light source and the display panel
Implementation Method 2
the display apparatus further includes a diffusion layer disposed on the first surface or a second surface facing away from the first surface of the cover and overlapping the display area
Implementation Method 3
the display apparatus further includes a refractive layer disposed on the first surface or a second surface facing away from the first surface of the cover and overlapping the display area. The refractive layer is provided with a plurality of optical microstructures on a surface facing away from the cover
Data Source
AI summary
A display apparatus including a frame, a cover, a display panel, a light source and a reflective layer is provided. The cover is connected to the frame to form an accommodating space. The display panel is disposed in the accommodating space. The light source is disposed on the frame and adjacent to the cover. The reflective layer is disposed on a first surface of the cover facing the frame, and is located between the light source and the cover. The reflective layer extends between the light source and the display panel, and does not overlap a display area of the display apparatus.