E-Paper Display Viewing Angle Filter for Light Leakage Control
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Solution Overview
Problem
E-paper display panels in large-sized applications, such as outdoor advertising boards, suffer from light leakage at large viewing angles, causing discomfort and potentially affecting traffic safety due to direct light emission from the light source.
Innovation Solution
A display device design incorporating a viewing angle limiting structure between the light source and the cover plate, which suppresses direct light emission without blocking the display region, using a viewing angle filter or optical coating to limit the viewing angle to less than 30 degrees, thereby reducing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light source is independently disposed in front of the E-paper display panel, then the display device can achieve good display effects and energy efficiency, but light leakage occurs at large viewing angles causing discomfort and affecting traffic safety
Solution Approach 1:
A viewing angle limiting structure is introduced as an intermediary component between the light source and the peripheral visible region of the cover plate. This structure selectively blocks light rays that would cause leakage while allowing display light to pass through, thus resolving the contradiction between achieving good display effects and preventing light leakage at large viewing angles
Solution Approach 2:
The viewing angle limiting structure is specifically positioned in the peripheral visible region of the cover plate, creating a localized solution that addresses light leakage only where it occurs without affecting the central display region. This local intervention allows the light source to maintain its independent front disposition for optimal display effects while eliminating harmful light leakage at the periphery
2Object-affected harmful factors
If the viewing angle limiting structure is disposed on the peripheral visible region of the cover plate, then light leakage is suppressed, but the device complexity increases
Solution Approach 1:
The viewing angle limiting structure can be implemented as a thin film or coating layer on the peripheral visible region of the cover plate, rather than a bulky three-dimensional component. This thin-film approach suppresses light leakage effectively while minimizing the increase in device complexity and maintaining a sleek overall structure
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 enhances display quality by minimizing light leakage at large viewing angles, ensuring comfortable viewing and maintaining traffic safety by reducing visual stimulation, particularly in outdoor applications.
Implementation Method 1
The viewing angle limiting structure includes a viewing angle filter. The viewing angle of the viewing angle limiting structure is less than and equal to 30 degrees.
Implementation Method 2
The viewing angle limiting structure includes an optical coating.
Implementation Method 3
The light source includes light-emitting elements located at two opposite sides of the visible region. The light-emitting elements are disposed facing each other, and a light emitted by the light-emitting elements is suitable for mixing in the accommodating space between the E-paper display panel and the cover plate.
Implementation Method 4
The E-paper display panel is disposed inside the accommodating space, wherein the E-paper display panel has a display region
Data Source
AI summary
A display device including a housing, a cover plate, an E-paper display panel, a light source, and a viewing angle limiting structure is provided. The cover plate and the housing define an accommodating space. The cover plate has a visible region and a border region surrounding the visible region. The E-paper display panel is disposed inside the accommodating space and has a display region. In a viewing direction perpendicular to the E-paper display panel, a boundary of the display region is retracted inwardly with respect to a boundary of the visible region, so that the visible region of the cover plate has a center visible region aligned with the display region and a peripheral visible region located between the center visible region and the border region. The light source is disposed inside the accommodating space and located at the border region. A distance between the E-paper display panel and the cover plate is greater than a distance between the light source and the cover plate. The viewing angle limiting structure is located on a light propagating path from a light-emitting surface of the light source to the peripheral visible region of the cover plate.