Curved-Surface LCD Cover Plate Design for Light Leakage Prevention
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Solution Overview
Problem
Existing curved-surface liquid crystal displays face issues with light leakage due to deformation of glass substrates and concentrated stress during bending, particularly in IPS and ADS modes, leading to polarization state changes and light leakage problems.
Innovation Solution
A curved-surface liquid crystal display design featuring a planar backlight module and liquid crystal display panel with a concave cover plate fixed through a frame, where the cover plate has a concave first surface and a convex second surface, or vice versa, to maintain light propagation direction and reduce stress, thereby preventing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the liquid crystal display panel is bent into an arc to achieve curved-surface design, then the curved-surface display effect is improved, but the glass substrates deform causing polarization state changes and light leakage
Solution Approach 1:
The patent divides the curved-surface structure into separate components: the liquid crystal display panel remains planar while the cover plate is bent into an arc shape. This segmentation allows the curved display effect to be achieved without deforming the glass substrates of the liquid crystal panel, thereby preventing polarization state changes and light leakage.
Solution Approach 2:
The patent transfers the curvature from the liquid crystal display panel to the cover plate, effectively moving the curved-surface design to a different dimensional layer. The planar liquid crystal panel is protected from bending stresses while the arc-shaped cover plate provides the desired curved display appearance.
2Shape
If the liquid crystal display panel is bent to achieve curved-surface design, then the curved display shape is improved, but concentrated stress at peripheral portions causes severe light leakage
Solution Approach 1:
The patent separates the structural components so that the liquid crystal display panel remains planar and free from bending stresses, while the cover plate absorbs all curvature-related stresses. This segmentation eliminates concentrated stress at the peripheral portions of the liquid crystal panel that would otherwise cause severe light leakage.
Solution Approach 2:
The frame acts as an intermediary structure that supports the arc-shaped cover plate while maintaining the planar liquid crystal display panel. This intermediary arrangement allows the curved shape to be achieved without transmitting bending stresses to the liquid crystal panel's glass substrates.
3Shape
If the liquid crystal display panel is bent into an arc, then the curved-surface design is achieved, but the glass substrates experience tensile and compression forces
Solution Approach 1:
The patent divides the curved-surface structure into distinct components where only the cover plate is bent into an arc while the liquid crystal display panel with glass substrates remains planar. This segmentation protects the glass substrates from tensile and compression forces that would weaken them.
Solution Approach 2:
Instead of bending the liquid crystal display panel to achieve curvature, the patent inverts the approach by keeping the liquid crystal panel planar and bending the cover plate. This inversion protects the glass substrates from mechanical stresses while still achieving the desired curved-surface design effect.
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 effectively prevents light leakage and maintains the viewing angle by ensuring that light does not change direction after passing through the cover plate, addressing the stress and deformation issues associated with bending the liquid crystal display panel.
Implementation Method 1
the first surface being concave... ensures that light does not change direction after passing through the cover plate
Data Source
AI summary
The disclosure relates to a curved-surface liquid crystal display, comprising a backplane, a backlight module, a liquid crystal display panel and a frame, the backlight module and the liquid crystal display panel both being of a planar structure, the backlight module being provided within the backplane, the liquid crystal display panel being provided on the light emergent side of the backlight module, the curved-surface liquid crystal display further comprising a cover plate fixed onto the liquid crystal display panel through the frame, the cover plate comprising a first surface deviating from the liquid crystal display panel and a second surface facing the liquid crystal display panel, the first surface being concave. The curved-surface liquid crystal display provided by the disclosure implements the curved-surface design with the cover plate having a curved-surface structure, further avoiding the problem of light leak caused by the bending of the liquid crystal display panel.