Display Panel Shared Voltage Lines for Micro LED Luminance Control
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Solution Overview
Problem
Micro LEDs face challenges in accurately implementing desired luminance due to peak wavelength shifts with current density, making Pulse Width Modulation (PWM) pixel driving necessary, but this method can be improved for better control.
Innovation Solution
A display device and panel design where sub-pixels share lines with different voltage levels, using first and second shared lines to provide distinct voltages to adjacent sub-pixels, enhancing luminance control through shared conductive layers with extension and connection portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If Pulse Width Modulation (PWM) pixel driving method is used to control luminance in micro LEDs, then luminance control capability is improved, but luminance accuracy deteriorates due to peak wavelength shifts with current density
Solution Approach 1:
The patent segments the boundary area between sub-pixels into multiple regions, with each region having its own shared line providing a specific voltage. This segmentation allows different voltage levels to be applied to different sub-pixel groups, compensating for luminance variations caused by PWM driving and current density effects on peak wavelength.
Solution Approach 2:
The patent implements local quality by providing different voltages to different local regions (boundary areas) between sub-pixels. Each shared line in a specific boundary area provides a tailored voltage to adjacent sub-pixels, creating locally optimized luminance compensation rather than a uniform approach.
2Device complexity
If sub-pixels share common lines for voltage provision, then device complexity is reduced, but luminance control precision deteriorates due to uniform voltage application
Solution Approach 1:
Rather than using a single common shared line for all sub-pixels, the patent segments the shared lines into multiple distinct lines, each serving a specific boundary area. This segmentation maintains relatively simple device structure while enabling differentiated voltage provision to achieve precise luminance control.
Solution Approach 2:
The patent applies local quality by configuring shared lines such that each line serves a specific local boundary area with tailored voltage characteristics. This allows luminance precision to be improved in each local region without requiring completely independent wiring for each sub-pixel.
3Measurement precision
If multiple shared lines with different voltages are disposed in boundary areas, then luminance accuracy is improved, but device complexity increases
Solution Approach 1:
The patent implements local quality by placing multiple shared lines with different voltages in boundary areas between sub-pixels. Each shared line is positioned in a specific boundary area and provides a voltage tailored to the luminance characteristics of adjacent sub-pixels, achieving high luminance accuracy through localized voltage optimization.
Solution Approach 2:
The patent merges the functions of multiple shared lines into a coordinated system where lines in different boundary areas work together to provide comprehensive voltage compensation. This combining approach achieves high luminance accuracy while managing device complexity through systematic integration of the multiple lines.
Data Source
AI summary
A display device includes a substrate, sub-pixels disposed on the substrate, a first shared line which is disposed in a boundary area between the sub-pixels and provides a first voltage to the sub-pixels adjacent to the boundary area, and a second shared line which is disposed in the boundary area and provides a second voltage different from the first voltage to the sub-pixels adjacent to the boundary area.