Angled Optical Member Prevents Display Panel Scratching
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Solution Overview
Problem
In large-area liquid crystal display devices, the optical member such as a diffusive plate, when subjected to vibrations, tends to swing and potentially scratch the display panel, leading to deteriorated image quality due to non-uniform brightness and direct contact with polarizers.
Innovation Solution
The optical member is disposed at an angle to the display panel, with varying distances from its ends to the panel, and supported by frame members and reflective plate, preventing swinging and ensuring uniform light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the optical member is disposed parallel to the display panel and held by frame members, then the structure is simple and easy to manufacture, but the optical member swings when vibrations are applied and may touch the display panel causing scratching
Solution Approach 1:
The optical member is disposed at an angle (e.g., 5-15 degrees) relative to the display panel rather than parallel, creating an asymmetric configuration. This angular disposition prevents the optical member from swinging into contact with the display panel during vibrations, as the contact points are offset, thereby eliminating the scratching problem while maintaining structural simplicity
Solution Approach 2:
The solution introduces a angular dimension to the disposition of the optical member. Instead of merely adjusting the distance in one dimension (parallel spacing), the optical member is tilted at an angle, adding a rotational dimension to the configuration. This angular adjustment creates a geometric relationship where vibration-induced swinging does not result in contact with the display panel
2Reliability
If the optical member is disposed at an angle to prevent swinging, then reliability improves, but the structure becomes more complex
Solution Approach 1:
The angular disposition creates an asymmetric structure where the optical member is tilted relative to the display panel. This asymmetry is achieved through simple geometric configuration rather than complex mechanisms, maintaining manufacturing ease while preventing vibration-induced contact
Solution Approach 2:
The invention changes the disposition parameter from parallel (0 degrees) to an angled configuration (e.g., 5-15 degrees). This parameter change in the angular orientation achieves the vibration prevention function without requiring additional components or complex structural modifications
Data Source
AI summary
There is disclosed a display device having a display panel which is prevented from being scratched if an optical member such as a diffusive plate located behind the display panel swings. The display device has the display panel, an array of light sources disposed behind the display panel, and the optical member disposed between the display panel and the array of light sources. The distance between a first end of the optical member and the display panel is set greater than the distance between a second end of the optical member and the display panel, the second end being opposite to the first end.