Display Device Asymmetric Pixel Arrangement Viewing Angle
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Solution Overview
Problem
Display devices using light emitting elements, such as organic EL, face issues with non-uniform luminance and tint due to the arrangement of light emitting areas and contact holes, leading to degradation in display characteristics when viewed from different angles, as the orientation and shape of these areas cause variations in reflected light intensity and color.
Innovation Solution
The arrangement of light emitting areas and colored areas with predetermined planar shapes having no rotational symmetry, and varying rotation angles, ensures that the luminance and tint appear uniform across different viewing directions by dispersing and homogenizing differences in full-color pixels, where the direction from colored areas to contact holes also varies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light emitting areas are arranged in the same orientation with long sides aligned, then manufacturing is simplified, but display characteristics degrade due to non-uniform luminance and tint when viewed from different angles
Solution Approach 1:
The patent applies asymmetry by arranging light emitting areas with different orientations (rotated at different angles) rather than all in the same orientation. This asymmetric arrangement prevents the formation of dominant reflection directions, thereby reducing viewing angle dependence and improving display characteristics while maintaining manufacturing feasibility through systematic pattern design.
Solution Approach 2:
The patent segments the display into multiple types of pixel groups, where each group contains light emitting areas with specific orientation patterns. By dividing the display into these segmented groups with different characteristics, the overall reflection uniformity is improved while maintaining ease of manufacture through modular design.
2Ease of manufacture
If light emitting areas are shifted from openings of the black matrix, then contact holes can be positioned, but reflected light intensity varies depending on viewing direction causing non-uniform luminance
Solution Approach 1:
The patent applies local quality by creating different arrangement patterns for light emitting areas in different pixel groups. Each local region (pixel group) has its own characteristic orientation pattern, which when combined across the entire display, achieves overall luminance uniformity while allowing contact holes to be properly positioned in each local region.
3Ease of manufacture
If colored areas have fixed rotation angles in all pixels, then manufacturing is simplified, but tint varies depending on viewing direction
Solution Approach 1:
The patent applies asymmetry to colored areas by assigning different rotation angles to colored areas in different pixel groups. This asymmetric arrangement prevents dominant reflection directions for any single color, thereby maintaining tint consistency across different viewing directions while maintaining manufacturing simplicity through systematic pattern assignment.
4Ease of manufacture
If light emitting areas have rectangular shapes with cut corners, then contact holes can be positioned, but reflected light creates viewing angle dependence
Solution Approach 1:
The patent converts the potentially harmful effect of sharp corners (which create strong reflections) into a beneficial pattern by systematically arranging different orientations of these shaped areas. The corner reflections from different orientations cancel each other out, transforming the harmful reflection effect into a uniform appearance across viewing angles.
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
This arrangement results in consistent luminance and tint across all viewing directions, improving display characteristics by minimizing the impact of contact holes on light reflection and emission patterns.
Implementation Method 1
a light emitting element layer which is in contact with the plurality of pixel electrodes in such a way that the plurality of openings form a plurality of light emitting areas
Implementation Method 2
a color filter layer having a black matrix that forms light blocking areas
Implementation Method 3
external light is reflected off the contact holes, and the direction in which intense reflected light is visible varies depending on the positions of the contact holes relative to the light emitting areas
Data Source
AI summary
In a display device, light emitting areas and colored areas each have a predetermined planar shape having no rotational symmetry so that rotation of the area by an angle greater than or equal to 0° but smaller than 360° does not produce an initial shape of the area and are so arranged as to have different types of rotation angle. The colored areas are grouped based on a set of the colored areas of colors different from one another to forma plurality of full-color pixels. The full-color pixels are so arranged that the rotation angle of the colored areas of the same color have different types. In the full-color pixels of the same type, the colored areas of the same color have the same rotation angle. In the full-color pixels of different types, the colored areas of the same color have different rotation angles.