Optical Sheet Prism Patterns for Curved Display Light Control
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Solution Overview
Problem
Curved display apparatuses face challenges in maintaining display quality, particularly in terms of white angle difference (WAD), brightness, and color coordinate variation, due to the distortion of light as it exits from curved areas, leading to reduced display performance compared to flat areas.
Innovation Solution
Incorporating optical sheets with varying first and second optical patterns, including prisms of different shapes and sizes, that refract light exiting from the display panel to maintain the direction and quality of light, thereby ensuring consistent brightness and color across both flat and curved display areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a curved display area is implemented, then the display apparatus can be flexibly shaped and adapted to various forms, but the display quality deteriorates due to light distortion, white angle difference, and color coordinate variation
Solution Approach 1:
The optical sheet is divided into multiple regions with different optical patterns: a first optical pattern (prisms) for the curved display area and a second optical pattern (flat surface) for the flat display area. This segmentation allows each region to be optimized independently for its specific function, maintaining display quality in curved areas while preserving the adaptability of various display shapes.
Solution Approach 2:
Different optical properties are applied to different locations on the optical sheet. The curved display area receives a first optical pattern with specific prism configurations to correct light distortion, while the flat display area receives a second optical pattern. This local differentiation ensures that each area has the appropriate optical characteristics for its function, resolving the contradiction between curved shape adaptability and display quality.
2Manufacturing precision
If optical patterns are added to correct light direction, then display quality is maintained, but the device complexity increases due to additional optical sheets and patterns
Solution Approach 1:
Multiple optical functions are merged into a single optical sheet. The first optical pattern (prisms for light direction control), the second optical pattern (flat surface for normal areas), and the dummy layer (for structural support and optical uniformity) are all integrated into one component. This merging reduces the total number of separate optical components while maintaining the necessary functions to correct light distortion and maintain display quality.
Solution Approach 2:
The optical sheet serves multiple functions simultaneously: it controls light direction in curved areas through the first optical pattern, maintains normal optical properties in flat areas through the second optical pattern, and provides structural support through the dummy layer. This multi-functionality reduces the need for separate components, thereby reducing device complexity while maintaining display quality.
3Reliability
If prisms with varying inclination angles are used, then light direction is precisely controlled to maintain white angle difference property, but the manufacturing precision requirements increase
Solution Approach 1:
The inclination angles of the prisms are systematically varied according to their position in the curved display area. Prisms closer to the curved edge have different inclination angles than those near the flat area, allowing precise control of light direction to maintain the white angle difference property. This parameter variation is designed to compensate for the varying light distortion across the curved surface, improving reliability while managing manufacturing precision requirements through a systematic gradient approach.
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 maintains the white angle difference property and prevents color coordinate variation in curved display areas, thereby enhancing the overall display quality by ensuring consistent light direction and color fidelity across the entire display panel.
Implementation Method 1
The first optical pattern overlapping the curved display area and configured to change a traveling direction of light exiting from the display panel
Data Source
AI summary
A display apparatus includes: a display panel including a flat display area and a curved display area; and an optical sheet on the display panel. The optical sheet includes a first optical pattern overlapping the curved display area and configured to change a traveling direction of light exiting from the display panel.