OLED Array Substrate Layout for Wide-Angle Color Uniformity
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Solution Overview
Problem
Existing top-emission OLED display panels suffer from color shift and luminance decay asymmetry under large view angles due to the structure of the OLED device, causing color coordinates to deviate and luminance to attenuate unevenly with changing view angles.
Innovation Solution
The array substrate design includes pixel regions with sub-pixels arranged in a manner where signal lines are positioned differently in first and second areas relative to a virtual center line, ensuring symmetrical luminance decay and complementary color shifts across adjacent pixel regions, thereby reducing asymmetry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If signal lines are positioned on one side of light-emitting units in conventional OLED displays, then the device structure is simple and easy to manufacture, but color shift asymmetry and luminance decay asymmetry occur under large view angles
Solution Approach 1:
The patent applies asymmetry principle by intentionally creating mirror-image asymmetric arrangements of signal lines in adjacent pixel regions. Specifically, in first pixel regions, signal lines are positioned on a first side of the light-emitting unit, while in second pixel regions, signal lines are positioned on a second side (mirror image). This asymmetric design compensates for the inherent asymmetric luminance decay of OLEDs at large view angles, thereby reducing color shift asymmetry and improving color accuracy without complicating the manufacturing process.
2Device complexity
If OLED devices use conventional signal line arrangement, then device complexity is low, but color shift phenomenon and luminance decay asymmetry are unavoidable under large view angles
Solution Approach 1:
The patent implements asymmetry by configuring signal lines in adjacent pixel regions to be mirror images of each other. In first pixel regions, signal lines are arranged on one side of the light-emitting unit, while in second pixel regions, they are arranged on the opposite side. This creates a controlled asymmetric structure that compensates for the natural asymmetric luminance decay of OLEDs, reducing color shift phenomenon and improving display reliability under large view angles while maintaining relatively simple device complexity.
Solution Approach 2:
The patent applies local quality principle by differentiating the signal line arrangement in different pixel regions. Instead of using a uniform arrangement throughout the display, the patent creates local variations where adjacent pixel regions have mirror-image signal line configurations. This local differentiation allows each region to compensate for its specific viewing angle characteristics, thereby improving overall display color accuracy without requiring complete redesign of the entire device structure.
3Ease of manufacture
If all pixel regions use the same signal line arrangement, then manufacturing consistency is high, but color asymmetry occurs across the display under large view angles
Solution Approach 1:
The patent resolves this contradiction by introducing controlled asymmetry through mirror-image arrangements. While maintaining consistent manufacturing processes, the patent configures signal lines in first pixel regions and second pixel regions as mirror images of each other. This approach preserves manufacturing consistency (as the mirror-image pattern can be implemented through standardized photomask designs) while achieving color uniformity across the display by compensating for viewing angle-induced color asymmetry.
Solution Approach 2:
The patent applies segmentation by dividing the display into first pixel regions and second pixel regions with different signal line arrangements. This segmentation allows each region type to have optimized signal line configurations that, when combined in a mirror-image pattern, achieve overall color uniformity. The segmentation strategy enables differentiated local arrangements while maintaining manufacturability through repetitive patterns.
Data Source
AI summary
An array substrate includes pixel regions each including at least one sub-pixel. The sub-pixel includes: a light-emitting unit and a signal line corresponding thereto. The signal line extends along a second direction. The light-emitting unit includes a first electrode. The pixel regions include first and second pixel regions adjacent to each other in a first direction. The at least one sub-pixel at least includes a sub-pixel of a first light-emitting color. Each sub-pixel includes a first area and a second area respectively on two sides of a virtual center line. The virtual center line passes through a center of the light-emitting unit in the first direction and extends along the second direction. In sub-pixels of the first light-emitting color of the first and second pixel regions, projections of signal lines on the base substrate fall into projections of the first and second areas on the base substrate, respectively.