OLED Wiring Layout Reduces Luminance Unevenness
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Solution Overview
Problem
Display devices with OLEDs often experience luminance unevenness due to mismatches between the current corresponding to image signals and the drive current supplied to organic light emitting elements, leading to decreased image quality.
Innovation Solution
A display device configuration featuring a pixel with an organic light emitting element and a pixel circuit, along with specific wiring arrangements to control the current, including first, second, and third signal wirings that are arranged in a manner to reduce parasitic capacitance and simplify the layout, thereby minimizing luminance unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional wiring arrangements are used to supply control signals to pixel circuits, then the layout is simple, but parasitic capacitance increases causing luminance unevenness
Solution Approach 1:
The patent introduces a third wiring layer (EM signal wiring) arranged in the second direction (vertical) that intersects with the first and second wirings arranged in the first direction (horizontal). This dimensional arrangement allows the EM signal wiring to pass between the first and second wirings, reducing parasitic capacitance between them while maintaining a compact layout structure.
Solution Approach 2:
The patent applies different wiring arrangements in different spatial regions. Specifically, the third wiring is positioned to be closer to the first wiring than to the second wiring in certain regions, creating asymmetric local configurations that optimize signal integrity and reduce parasitic capacitance effects in critical areas.
2Manufacturing precision
If more wirings are added to control pixel circuits independently, then luminance control precision improves, but device complexity increases
Solution Approach 1:
The third wiring (EM signal wiring) serves multiple functions: it controls the emission timing of the organic light emitting element, acts as a reference signal for the pixel circuit, and helps reduce parasitic capacitance between the first and second wirings. This multi-functional design improves luminance control precision without proportionally increasing device complexity.
Solution Approach 2:
The patent combines the emission control function and the parasitic capacitance reduction function into a single third wiring structure. By merging these functions into one element rather than adding separate components, the design achieves improved luminance control precision while minimizing the increase in device complexity.
Data Source
AI summary
An object is to provide a display device of an organic light emitting type suppressing luminance unevenness. The display device includes: a pixel including an organic light emitting element and a pixel circuit that controls a current supplied to the organic light emitting element; a first wiring 41 and a second wiring 42 supplying a first signal used for controlling the pixel circuit to the pixel circuit; and a third wiring 43 suppling a second signal used for controlling the pixel circuit to the pixel circuit. The first wiring 41 to the third wiring 43 are arranged inside an area in which the pixel circuit is arranged in a first direction, and the third wiring 43 is arranged between the first wiring 41 and the second wiring 42.