Display Panel Unit Region Segmentation for Viewing Angle Control
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Solution Overview
Problem
Display devices struggle to maintain consistent image quality across different viewing angles, particularly in private viewing modes where narrower viewing angles are required to prevent personal information leakage.
Innovation Solution
A display device with a panel design featuring distinct light emitting regions and a light blocking pattern, where the number and size of unit regions vary to provide consistent color purity and luminance, and an optical member to manage external light reflectance, allowing for operation in both normal and private modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a display device uses a conventional uniform light emitting region design, then the manufacturing process is simple, but the color purity varies significantly at different viewing angles
Solution Approach 1:
The light emitting region is divided into multiple unit regions arranged in a matrix pattern. Each unit region has the same width but different lengths, creating segmented structures that control light emission at different viewing angles. This segmentation allows the display to maintain consistent color purity across wide and narrow viewing angles by selectively emitting light from appropriate unit regions.
Solution Approach 2:
Different unit regions within the light emitting region are designed with different dimensions (width and length) to provide localized optical characteristics. The varying lengths of unit regions create different emission patterns for different viewing angles, while the uniform width maintains consistency. This local quality variation enables the display to achieve both wide viewing angle color purity and narrow viewing angle privacy protection.
2Adaptability or versatility
If a display device provides wide viewing angle for normal use, then user accessibility is improved, but personal information may be visible to bystanders
Solution Approach 1:
The display device dynamically switches between two operational modes: a normal viewing mode with wide viewing angle for general accessibility, and a private viewing mode with narrow viewing angle for privacy protection. The light emitting elements are selectively controlled to emit light from different unit regions depending on the operating mode, enabling the display to adapt to different usage scenarios and prevent information leakage when needed.
3Manufacturing precision
If the light emitting regions are made with different dimensions to control viewing angles, then color purity is maintained, but the manufacturing precision requirement increases
Solution Approach 1:
The unit regions are designed with controlled variations in length while maintaining uniform width. This parameter change strategy allows the display to achieve different emission characteristics for different viewing angles. The systematic variation in unit region dimensions creates a gradient effect that maintains color purity across viewing angles while providing the necessary privacy protection in narrow viewing angle mode.
Data Source
AI summary
A display device includes a display panel that includes a first region and a second region, each of that includes first to third light emitting regions and a non-light emitting region, and that includes first to third light emitting elements that provide different colors of light to corresponding first to third light emitting regions, at least one insulation layer disposed on the display panel, a light blocking pattern disposed on the insulation layer, and that overlaps the non-light emitting region, and a passivation layer that covers the light blocking pattern, wherein each of the first to third light emitting regions of the second region includes a plurality of unit regions, and each of the unit regions has the same width in one direction, and has a width smaller than the width of each of the first to third light emitting regions of the first region in the one direction.