Symmetrical Pixel Circuit Layout for Uniform Display Brightness
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Solution Overview
Problem
Existing display devices face challenges in achieving improved display quality and efficiency, particularly in the design and layout of pixel circuits, which affect the performance and symmetry of transistors and capacitors, leading to potential issues in brightness control and image quality.
Innovation Solution
The display device incorporates a substrate with pixel circuit areas arranged along specific directions, featuring line-symmetrical transistors and capacitors, including driving, compensation, and initialization transistors, with optimized wiring configurations to enhance symmetry and efficiency, and uses silicon-based semiconductor materials for the semiconductor layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pixel circuits are designed with conventional asymmetric layouts, then manufacturing is simpler, but display quality and brightness control uniformity deteriorate
Solution Approach 1:
The patent applies asymmetry in reverse - it deliberately creates symmetric layouts where traditional asymmetric designs would suffice. By making the pixel circuits and transistor arrangements symmetric with respect to the light-emitting element, the patent achieves uniform electrical characteristics and improved display quality, while the symmetry itself simplifies the design process and manufacturing alignment requirements
2Ease of manufacture
If transistor layouts are asymmetric, then device fabrication is easier, but brightness control uniformity and image quality worsen
Solution Approach 1:
The patent employs symmetric arrangements of transistors relative to the light-emitting element, ensuring that electrical paths and capacitance distributions are uniform. This symmetry guarantees consistent brightness control across different pixels while maintaining fabrication simplicity through standardized symmetric patterns that are easier to align and manufacture
3Productivity
If pixel circuits use non-symmetrical arrangements, then design and fabrication are simpler, but image quality and display performance deteriorate
Solution Approach 1:
The patent utilizes symmetric pixel circuit arrangements where transistors and capacitors are positioned symmetrically with respect to the light-emitting element. This symmetry ensures uniform electrical characteristics and consistent image quality across the display, while the standardized symmetric design actually improves design efficiency through template-based fabrication and reduced alignment complexity
Data Source
AI summary
A display device includes a substrate including a first and second pixel circuit area adjacent to each other; a pixel circuit on the substrate and including a first pixel circuit in the first pixel circuit area, a second pixel circuit in the second pixel circuit area; and a light-emitting element connected to the pixel circuit, wherein each of the pixel circuits includes: a first transistor connected to a driving voltage line and the light-emitting element and for supplying current to the light-emitting element; a second transistor connected to a data line and the first transistor; a third transistor connected to a gate and terminal of the first transistor; and a fourth transistor connected to the gate of the first transistor and a first initialization voltage line; and the third and fourth transistors of the first pixel circuit are line-symmetrical to those the second pixel circuit.