Display Driving Element Segmentation for Wider Gradation Range
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Solution Overview
Problem
Existing display devices face challenges in achieving a wide driving range for driving elements, which affects the gradation representation of images.
Innovation Solution
The display device incorporates a driving element with a first sub-driving element and a second sub-driving element, each having distinct gate electrode widths and configurations, including a lower metal pattern under the second gate electrode, to enhance the driving range and threshold voltage difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single driving element is used, then the device complexity is low, but the driving range is limited
Solution Approach 1:
The driving element is divided into two separate sub-driving elements (first sub-driving element and second sub-driving element) with different gate electrode widths. This segmentation allows each sub-driving element to operate in different voltage ranges, thereby extending the overall driving range while maintaining manageable complexity through modular design
Solution Approach 2:
Different gate electrode widths are assigned to different sub-driving elements to create localized variations in threshold voltage and current characteristics. The first gate electrode has a first width while the second gate electrode has a second width (different from the first), enabling each region to optimize its driving characteristics for specific luminance levels
2Adaptability or versatility
If the driving range is extended, then the gradation representation is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The invention changes the geometric parameter (gate electrode width) to create distinct threshold voltages for the two sub-driving elements. By controlling the width ratio between the first and second gate electrodes, the threshold voltage difference is optimized to achieve a driving range of 0.5V to 3V, balancing manufacturing precision requirements with performance goals
Data Source
AI summary
A display device includes a light emitting element and a driving element connected to the light emitting element and applying a driving current to the light emitting element. The driving element may include a first sub-driving element including a first gate electrode which has a first width in a first direction, and a second sub-driving element including a second gate electrode which has a second width different from the first width in the first direction and a lower metal pattern disposed under the second gate electrode.