Transflective Diffusion Sheet for Dual-Sided Display Luminance
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Solution Overview
Problem
Double-sided display devices face challenges in maintaining optimal luminance across both display panels when operating in environments with varying ambient light conditions, leading to inefficient light energy use and unclear displays due to mismatched luminance levels.
Innovation Solution
A diffusion sheet with a transflective layer, comprising alternating reflective and transmissive regions, is integrated into a backlight module to uniformly distribute light between two display panels, ensuring each panel receives adequate luminance by transmitting and reflecting light accordingly, and a diffusion structure increases the emergent angle of light for improved viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a single backlight module is used to illuminate both display panels, then the product thickness is reduced, but the luminance of the two display panels becomes substantially the same which cannot adapt to different ambient light conditions
Solution Approach 1:
The single backlight module is segmented into two independent backlight modules, each capable of independently controlling luminance. This allows each display panel to have adjustable luminance that can adapt to different ambient light conditions on each side of the device.
Solution Approach 2:
The luminance of each backlight module is made dynamically adjustable through independent control circuits and driving units. This enables the luminance to change in real-time based on ambient light conditions, transforming a static lighting system into a dynamic one that adapts to environmental changes.
2Illumination intensity
If the luminance of display panels is increased to be visible in high-luminance environments, then visibility in bright environments is improved, but light energy is wasted when ambient light is low
Solution Approach 1:
Light sensors detect ambient light intensity and provide feedback to control circuits, which then adjust the luminance of each backlight module accordingly. This feedback mechanism ensures the display luminance matches ambient conditions, preventing energy waste in dark environments while maintaining visibility in bright environments.
Solution Approach 2:
The luminance parameter of each backlight module is dynamically changed based on ambient light conditions. The system transitions between different luminance states (high for bright environments, low for dark environments) to optimize both visibility and energy efficiency.
3Strength
If reflective material is applied to the entire surface, then light reflection is maximized, but light transmission to the display panel is reduced
Solution Approach 1:
The surface is segmented into alternating reflective regions and transmissive regions. The reflective regions reflect light to improve viewing angles and reduce glare, while the transmissive regions allow light to pass through to the display panel, ensuring both reflection and transmission functions are achieved simultaneously.
Solution Approach 2:
Different regions of the surface are assigned different optical properties: some areas have high reflectivity to redirect light, while other areas have high transmissivity to allow light passage. This local differentiation of material properties enables simultaneous optimization of both reflection and transmission.
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 ensures both display panels maintain optimal luminance levels, even in environments with differing ambient light conditions, achieving clear displays and efficient light energy use by compensating for luminance differences and enhancing light distribution.
Implementation Method 1
The transflective layer transmits a portion of light incident from the second surface
Implementation Method 2
reflects another portion of the light incident from the second surface
Implementation Method 3
The diffusion structure includes a plurality of particles, and each particle has a radius of about 0.001 um to 0.1 um
Data Source
AI summary
A diffusion sheet, a backlight module and a double-sided display device are provided. A transflective layer is provided on one surface of a substrate layer. On one hand, a portion of the light incident from an opposite side of the substrate layer is transmitted to a first display panel via the diffusion sheet; on the other hand, another portion of the light is reflected back to the light guide plate and enters a second display panel on another side of the double-sided backlight module.