Off-axis Pixel Black Matrix for Wide Viewing Angle LCDs
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Solution Overview
Problem
Display devices face limitations in viewing angles, with brightness and color shifting as the viewing angle increases, particularly in larger displays or closer viewing distances, leading to reduced image quality.
Innovation Solution
A display device design featuring a black matrix with strategically positioned openings that allow light to pass through at specific angles, ensuring that the viewer aligns with the peak intensity distribution of each pixel, thereby maintaining image quality across the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the size of the display device increases, then the display area increases, but the viewing angle decreases and image quality deteriorates
Solution Approach 1:
The patent divides each pixel into multiple regions (first region and second region) with different light output characteristics. Each region is optimized to emit light in specific directions, creating local quality variations that collectively improve the overall viewing angle of the display device while maintaining large display area.
2Manufacturing precision
If the viewing distance decreases, then the display detail becomes more visible, but the viewing angle decreases and image quality deteriorates
Solution Approach 1:
By creating different regions within each pixel that emit light in different directions, the patent enables viewers at close distances to see detailed pixel structures while maintaining proper light distribution across the display, preventing viewing angle deterioration even when viewing distance decreases.
3Manufacturing precision
If the black matrix blocks more light to improve pixel definition, then the viewing angle decreases due to reduced light output
Solution Approach 1:
The patent creates different regions within each pixel (first region and second region) that emit light in different directions. The black matrix selectively blocks light from different sides of each pixel, and the multiple regions ensure that sufficient light reaches the viewer while maintaining pixel definition, thus resolving the contradiction between pixel definition and brightness.
Solution Approach 2:
Each pixel is segmented into multiple regions with different light output characteristics. This segmentation allows the black matrix to block light selectively from different sides while maintaining overall brightness through the combined light output from all regions, improving pixel definition without sacrificing viewing angle or brightness.
4Illumination intensity
If the black matrix openings are positioned to align with pixel centers, then the light output is maximized, but the viewing angle decreases for off-center pixels
Solution Approach 1:
The patent creates asymmetric light output characteristics within each pixel by dividing it into different regions. The first region and second region emit light in different directions, allowing the black matrix openings to be positioned at pixel centers while still directing light appropriately for off-center viewing positions, thus maintaining both light output and viewing angle consistency.
Solution Approach 2:
Different regions within each pixel are optimized for different viewing directions. This local quality variation ensures that even when black matrix openings are positioned at pixel centers, light is emitted in multiple directions to accommodate off-center viewing positions, maintaining viewing angle consistency across the display.
Data Source
AI summary
A display device includes a plurality of pixels arranged across a display area of a display device, and a black matrix configured to block a portion of light outputted by each pixel of the plurality of pixels. The black matrix is configured to allow light from the second pixel having a first output intensity distribution having a peak intensity corresponding to a first direction to pass through, and to allow light from the first pixel having a second output intensity distribution having a peak intensity corresponding to a second direction to pass through.