Connection Electrode Layout for Uniform Sub-Pixel Luminance
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Solution Overview
Problem
Display devices face challenges in achieving uniform luminance across sub-pixels due to variations in the number and arrangement of light-emitting elements, leading to differences in luminance between sub-pixels.
Innovation Solution
The display device selectively connects light-emitting elements in a designated manner using electrodes with main and subsidiary portions, ensuring a uniform number of light-emitting elements in each sub-pixel's emission area, with the connection electrodes having different widths and spacings to control the connection of light-emitting diodes, thereby reducing luminance differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If light-emitting elements are disposed in the emission area without selective connection control, then the emission area can be fully utilized, but the luminance uniformity across sub-pixels deteriorates due to variations in the number of connected light-emitting elements
Solution Approach 1:
The connection electrodes are divided into main portions and subsidiary portions with different widths. The main portions have larger widths to connect a greater number of light-emitting elements, while the subsidiary portions have smaller widths to connect fewer light-emitting elements. This segmentation allows different sub-pixels to have different connection configurations, achieving uniform luminance across the emission area while fully utilizing the available space.
2Ease of manufacture
If the number of light-emitting elements connected to each sub-pixel is not controlled, then the manufacturing process is simpler, but the luminance difference between sub-pixels increases
Solution Approach 1:
Different portions of the connection electrodes are designed with different widths to create local quality variations. The main portions have larger widths optimized for connecting more light-emitting elements in sub-pixels requiring higher luminance, while the subsidiary portions have smaller widths for sub-pixels requiring lower luminance. This local differentiation achieves uniform overall luminance while maintaining manufacturing simplicity through a systematic design approach.
Data Source
AI summary
A display device includes a first electrode extended in a first direction, a second electrode spaced apart from the first electrode in a second direction and extended in the first direction, a first insulating layer on the first and second electrodes, light-emitting elements on the first insulating layer, each having at least an end disposed on the first electrode or the second electrode, a second insulating layer disposed on the light-emitting elements and extended in the first direction, and a first connection electrode disposed on the first electrode and electrically contacting the light-emitting elements, a second connection electrode disposed on the second electrode and electrically contacting the light-emitting elements. Each of the first and second connection electrodes includes a main portion electrically contacting the light-emitting elements, and a subsidiary portion having a width smaller than a width of the main portion and electrically connected to the main portion.