Pixel Circuit With Alternating Dual Emitters for Dark Spot Tolerance
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Solution Overview
Problem
Micro LED display devices face issues with defective sub-pixels due to contact failures and uneven luminance, limiting resolution and transparency, especially when micro LEDs are transferred without proper binning, leading to dark spots and reduced light transmittance.
Innovation Solution
A pixel circuit design that includes two light-emitting elements connected in parallel or series, driven alternately by a driving transistor, reducing the number of sub-pixels per pixel and minimizing dark spots, thereby enhancing resolution and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two sub-pixels are arranged for each color within the pixel to remove dark spot defects, then dark spot defects are reduced, but it is difficult to increase the resolution of the display panel and transparency cannot be increased because the light transmittance is low
Solution Approach 1:
The patent merges two sub-pixels of the same color into a single pixel unit, sharing common circuit components (data line, gate line, emission signal line) and control logic. This consolidation reduces the overall number of discrete sub-pixel structures while maintaining the redundancy needed to eliminate dark spot defects, thereby improving light transmittance and enabling higher resolution.
2Reliability
If six sub-pixels are arranged in one pixel (two red, two green, and two blue sub-pixels), then dark spot defects are minimized, but resolution cannot be increased and light transmittance is low
Solution Approach 1:
The patent implements multi-functionality by having a single pixel circuit control two sub-pixels of the same color through shared data lines, gate lines, and emission signal lines. The pixel circuit can selectively activate either sub-pixel based on which one is functional, making the system universally adaptable to defect patterns while reducing the overall component count and improving light transmittance efficiency.
3Ease of manufacture
If micro LEDs are transferred without binning process, then manufacturing complexity is reduced, but contact failures and uneven luminance occur leading to dark spots
Solution Approach 1:
The patent applies beforehand cushioning by designing a pixel structure with redundant sub-pixels that can compensate for potential contact failures and luminance unevenness. Instead of preventing defects through complex binning processes, the system is designed in advance to tolerate and compensate for defects, allowing simple transfer processes while maintaining manufacturing precision through the dual sub-pixel architecture.
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
The proposed pixel circuit improves the efficiency and lifespan of light-emitting elements, enabling low-power operation and optimizing the display panel process to enhance pixel density and reduce dark spots, facilitating high-resolution and transparent display devices.
Implementation Method 1
first and second light-emitting elements electrically connected to the driving transistor in parallel or in series. The first and second light-emitting elements may be alternately driven by the current from the driving transistor.
Data Source
AI summary
The present disclosure relates to a pixel circuit and a display device including the same. The pixel circuit may include a driving transistor for generating a current, and first and second light-emitting elements electrically connected in parallel or in series to the driving transistor. The first and second light-emitting elements may be alternately driven by the current from the driving transistor.