Adjustable Beam Expanding Plates for LCD Visual Angle Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current liquid crystal display (LCD) backlight modules have a fixed visual angle, which is inadequate for varying user scenarios, as they either consume excess energy when only one person is viewing or fail to provide sufficient brightness when multiple people are viewing simultaneously.
Innovation Solution
A backlight system with adjustable visual angle is achieved by incorporating beam expanding plates with periodic curved surfaces, allowing the upper and lower sub-plates to be adjusted parallelly, enabling control over the visual angle of the light beam emitted by the backlight module without increasing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the visual angle of the liquid crystal display is set to a large range to accommodate multiple viewers, then the viewing demand of multiple users is satisfied, but unnecessary energy consumption occurs when only one user is present
Solution Approach 1:
The patent applies the dynamics principle by making the beam expanding plate adjustable rather than fixed. The plate can be positioned at different locations along the optical path to dynamically change the visual angle range. When multiple users are present, the plate is positioned to expand the beam for a large visual angle; when one user is present, it is repositioned to maintain a narrow visual angle, thus adapting to different viewing scenarios without wasting energy.
Solution Approach 2:
The patent uses parameter changes by varying the position of the beam expanding plate to control the visual angle range. By changing the plate's location parameter along the optical path, the system adjusts the beam expansion degree, thereby controlling whether the display presents a narrow or wide visual angle to match the number of viewers and optimize energy consumption.
2Device complexity
If the visual angle is fixed within a specific range (e.g., ±(30°-60°)), then the display structure is simple, but it cannot adapt to varying user scenarios requiring different viewing angles
Solution Approach 1:
The patent transforms the fixed visual angle structure into a dynamic one by introducing an adjustable beam expanding plate. This plate can be repositioned along the optical path to change the visual angle range, allowing the display to adapt between narrow and wide viewing angles while maintaining a relatively simple overall structure without requiring complex optical systems.
3Adaptability or versatility
If a beam expanding plate with adjustable position is introduced to achieve variable visual angle, then the adaptability to different viewing scenarios is improved, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the beam expanding plate into multiple sub-plates that can be independently positioned. Each sub-plate corresponds to a specific visual angle range, allowing selective activation of only the necessary segments based on the number of viewers. This reduces the overall complexity compared to a fully continuous adjustable system while maintaining adaptability.
Solution Approach 2:
The patent uses local quality by implementing different beam expansion characteristics at different regions of the display. The beam expanding plate is positioned to provide localized beam expansion only where needed, rather than uniformly expanding the entire beam. This allows the system to achieve variable visual angles with minimal structural changes and reduced complexity.
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 solution allows for adjustable irradiation range without increasing energy consumption, ensuring adequate brightness for both single and multiple viewers by controlling the visual angle of the light beam, thus enhancing the practicality of LCD displays.
Implementation Method 1
each beam expanding plate includes an upper beam expanding sub-plate and a lower beam expanding sub-plate each having the same periodic curved surface structure
Data Source
AI summary
The present invention discloses a backlight system and a display device. In the backlight system, corresponding at least one beam expanding plate is arranged at the emergent side of a backlight module, and include a horizontal beam expanding plate and/or a vertical beam expanding plate, wherein each beam expanding plate includes an upper beam expanding sub-plate and a lower beam expanding sub-plate having the same periodic curved surface structures, the upper beam expanding sub-plate and the lower beam expanding sub-plate are arranged in parallel in such a manner that periodic curved surface structures are back-to-back against each other, and the relative position of the upper beam expanding sub-plate and the lower beam expanding sub-plate in the horizontal direction can be adjusted parallelly within a set range.