Curved Display Panel Cell Thickness Adjustment for Light Leakage
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Solution Overview
Problem
Existing curved displays experience uneven brightness due to light leakage caused by bending, known as Curved L0 Mura, which affects the display's image quality and viewing experience.
Innovation Solution
A curved display panel design with spacers arranged between the array substrate and color film substrate, where the cell thickness varies between the central and peripheral regions, and spacer heights or distribution densities are adjusted based on a light leakage index to offset optical retardation inconsistencies, thereby reducing light leakage and brightness inconsistencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the curved display panel is bent to achieve a curved shape, then the viewing angle and panoramic image effect are improved, but light leakage and uneven brightness (Curved L0 Mura) occur in the peripheral regions
Solution Approach 1:
The patent applies local quality by making the cell thickness non-uniform across different regions of the curved display panel. Specifically, the cell thickness in peripheral regions is designed to be different from that in the central region, allowing each region to have optimized optical properties suitable for its location. This resolves the light leakage issue in peripheral regions while maintaining the curved shape and wide viewing angle benefits.
Solution Approach 2:
The patent changes the physical parameter of cell thickness from a uniform value to a spatially varying value. By adjusting the cell thickness parameter differently in central and peripheral regions, the optical retardation is compensated for the curved geometry, thereby reducing light leakage and uneven brightness while preserving the curved display's viewing advantages.
2Ease of manufacture
If the cell thickness is made uniform across the curved display panel, then the manufacturing process is simplified, but light leakage and brightness unevenness occur due to bending-induced optical retardation
Solution Approach 1:
The patent implements local quality by designing different cell thicknesses for different regions. The peripheral regions have optimized cell thickness to compensate for bending-induced optical retardation, while the central region maintains its original thickness. This regional differentiation improves brightness uniformity without significantly complicating the manufacturing process.
Solution Approach 2:
The patent introduces spatial variation in the cell thickness parameter to address brightness uniformity issues. By changing the cell thickness parameter based on position (smaller or larger in peripheral regions depending on the light leakage index), the optical performance is improved while maintaining reasonable manufacturing complexity.
3Illumination intensity
If the spacer height or distribution density is adjusted to reduce light leakage, then the brightness uniformity is improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by adjusting spacer height or distribution density specifically in peripheral regions where light leakage occurs, rather than uniformly across the entire panel. This localized adjustment improves brightness uniformity while minimizing the increase in device complexity, as only specific regions require modified spacer configurations.
Solution Approach 2:
The patent changes the spacer parameters (height or distribution density) in a spatially selective manner. By adjusting these parameters only in peripheral regions based on the light leakage index, the patent achieves brightness uniformity improvement with controlled device complexity, avoiding unnecessary modifications in the central region.
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 effectively minimizes light leakage and enhances brightness uniformity across the curved display panel, improving the overall display effect by adjusting cell thickness and spacer distribution to match specific light leakage conditions.
Implementation Method 1
a light leakage index which is a product of a designed cell thickness of the curved display panel and a refractivity difference of liquid crystal birefringence
Data Source
AI summary
The embodiments of the present invention provide a curved display panel and a curved display. The curved display panel comprises an array substrate and a color film substrate arranged oppositely, a plurality of spacers arranged between the array substrate and the color film substrate, a first curved side edge and a second curved side edge opposite to the first curved side edge. A cell thickness of a central region is different with a cell thickness of a peripheral region closed to the first curved side edge or the second curved side edge, such that a light leakage amount of the peripheral region is smaller than a first preset value. The curved display comprises the curved display panel provided by the embodiment of the invention.