Double-Sided Display Tilt and Diffusion for Uniform Brightness
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Solution Overview
Problem
Dual display devices with display panels mounted on both surfaces of a backlight unit experience issues with non-uniform brightness and deteriorated image quality due to tilting angles and viewer location, leading to a sense of transparency difference.
Innovation Solution
The dual display device includes first and second display panels tilted at a predetermined angle with respect to the backlight unit, accompanied by diffusion sheets or polarizing plates with matching haze on their back surfaces to ensure uniform brightness and improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If display panels are mounted parallel to both surfaces of the shared backlight unit, then device complexity is reduced, but image quality deteriorates depending on viewer's viewing location
Solution Approach 1:
The display panels are mounted at tilted angles (e.g., 15-45 degrees) relative to the backlight unit surfaces rather than parallel to them. This asymmetric mounting configuration allows viewers to view the display panels from opposite sides at comfortable angles, improving image quality and viewing comfort while maintaining the shared backlight unit structure.
2Ease of operation
If display panels are mounted at a predetermined tilt angle, then viewing comfort is improved, but brightness uniformity deteriorates
Solution Approach 1:
Diffusion sheets are positioned at specific locations (between the display panels and the backlight unit) to locally modify light distribution. These diffusion sheets scatter light uniformly across the display panel surfaces, compensating for the brightness non-uniformity introduced by the tilted mounting configuration and ensuring even brightness distribution while maintaining the tilt angle for comfortable viewing.
3Ease of operation
If display panels are mounted at a predetermined tilt angle, then viewing comfort is improved, but image quality deteriorates due to transparency difference
Solution Approach 1:
Diffusion sheets with specific optical properties (haze ratio of 30-70%) are positioned between the display panels and the backlight unit to locally control light scattering. This local modification ensures uniform light distribution across the tilted display panels, preventing transparency differences and maintaining consistent image quality while preserving the comfortable viewing angles.
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 reduces power consumption, prevents a sense of transparency difference, and ensures uniform brightness and enhanced image quality by optimizing panel tilt and using diffusion or polarizing elements.
Implementation Method 1
a first diffusion sheet disposed on a back surface of the first display panel facing the first light exit surface of the backlight unit
Implementation Method 2
a first polarizing plate disposed on the back surface of the first display panel facing the first light exit surface of the backlight unit
Data Source
AI summary
Disclosed is a dual display device. The dual display device includes a backlight unit having a light guide plate; a first display panel disposed on a first light exit surface of the backlight unit; and a second display panel disposed on a second light exit surface of the backlight unit opposite the first light exit surface, wherein the first display panel and the second display panel are mounted so as to be tilted at a predetermined angle with respect to the backlight unit. Accordingly, it is possible to reduce power consumption of the dual display device and to improve image quality.