Shared Pixel Circuit Layout for Transparent FSC Display Panels
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Solution Overview
Problem
Conventional transparent field sequential color (FSC) display panels face challenges due to the large area occupied by multiple signal lines and driving circuits, which affects transparency and leads to panel defects like mura.
Innovation Solution
The design incorporates a pixel circuit with a shared driving circuit for sub-pixel circuits, reducing the area occupied by driving circuits and ensuring a consistent number of data and signal lines, thereby minimizing panel defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple signal lines and driving circuits are used to drive micro-light emitting diodes, then the display function is achieved, but the area occupied increases and transparency is affected
Solution Approach 1:
The patent merges multiple driving circuits into a shared driving circuit that can sequentially control multiple light emitting elements. Instead of having separate driving circuits for each sub-pixel, a single driving circuit is designed to drive multiple light emitting elements through time-division multiplexing, thereby reducing the total area occupied by driving circuits while maintaining full display functionality.
Solution Approach 2:
The shared driving circuit is designed with multi-functional capability to perform the role of multiple driving circuits. It can sequentially connect to and control different light emitting elements (first, second, and third light emitting elements) through different stages, making a single circuit serve multiple functions that would traditionally require separate circuits.
2Reliability
If multiple signal lines are used to input gray-scale voltages to sub-pixel circuits, then color display is achieved, but the number of signal lines increases and panel defects occur
Solution Approach 1:
The patent combines multiple signal lines into a shared signal line that serves multiple sub-pixel circuits. Through time-division multiplexing and sequential connection, a single signal line can input control signals to multiple light emitting elements at different stages, reducing the total number of signal lines while preserving color display capability.
Solution Approach 2:
The driving circuit operates in periodic stages, sequentially connecting to different light emitting elements in a time-division manner. This periodic action allows a single signal line to serve multiple purposes by transmitting different signals at different time intervals, thereby reducing the number of simultaneous signal lines needed.
3Adaptability or versatility
If driving circuits occupy large area, then full driving functionality is provided, but aperture ratio is reduced
Solution Approach 1:
The patent merges multiple driving circuits into a single shared driving circuit, significantly reducing the area occupied by driving functionality. This consolidation maintains full driving capability through sequential operation while freeing up space that improves the aperture ratio of the display panel.
Solution Approach 2:
The patent extracts the common driving functionality from multiple separate driving circuits and consolidates it into a single shared circuit. By taking out the redundant portions of multiple circuits and merging them into one, the overall area is reduced while the essential driving functionality is preserved through time-division multiplexing.
Data Source
AI summary
A display panel includes a pixel circuit. The pixel circuit includes a first sub-pixel circuit and a second sub-pixel circuit. The first sub-pixel circuit includes a first light emitting element and a first driving circuit. The first driving circuit is coupled to the first light emitting element, and is configured to conduct according to a first driving signal and a second driving signal to drive the first light emitting element. The second sub-pixel circuit includes a second light emitting element, a third light emitting element and a second driving circuit. The second driving circuit is coupled to the second light emitting element and the third light emitting element, is configured to conduct according to the first driving signal to drive the second light emitting element, and is configured to conduct according to the second driving signal to drive the third light emitting element.