Display Substrate Circuit Sharing for High-PPI OLED Pixels
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Solution Overview
Problem
OLED display substrates face challenges in achieving high resolution due to the large area occupied by sub-pixels, which include light-emitting drive circuits and reset circuits.
Innovation Solution
The display substrate design allows at least two sub-pixels to share the same reset circuit and/or compensation circuit, reducing the number of circuits required and minimizing the occupied area, thereby enabling high-resolution displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each sub-pixel includes independent reset circuit and compensation circuit, then display functionality is ensured, but occupied area increases and pixel density decreases
Solution Approach 1:
The patent merges the reset circuit and compensation circuit into a shared target circuit that serves multiple sub-pixels. Specifically, one target circuit is designed to provide reset signals to multiple light-emitting elements and compensate for threshold voltage shifts in multiple drive circuits, thereby reducing the total number of circuits while maintaining display reliability
Solution Approach 2:
The target circuit is designed with multi-functionality to perform both reset and compensation functions for multiple sub-pixels simultaneously. The circuit can selectively provide reset signals during initialization and compensation signals during operation, making a single circuit serve multiple purposes across multiple sub-pixels
2Area of moving object
If circuit sharing is implemented to reduce area, then pixel density increases, but circuit design complexity increases
Solution Approach 1:
The patent segments the circuit operations into distinct phases: reset phase and compensation phase. The target circuit is controlled to operate in different modes at different times, providing reset signals to multiple sub-pixels during initialization and switching to providing compensation signals during normal operation. This temporal segmentation simplifies the control logic despite spatial sharing
Solution Approach 2:
The reset function is performed as a preliminary action before normal display operation begins. By completing the reset of multiple sub-pixels in advance through the shared target circuit, the system prepares all elements for subsequent compensation and display operations, reducing the need for separate reset circuits for each sub-pixel
Data Source
AI summary
A display substrate and a display apparatus are provided. The display substrate comprises: a base substrate, a plurality of sub-pixels which are arranged in an array on the base substrate, and a first drive circuit and a second drive circuit, wherein each of the sub-pixels comprises a light-emitting driving circuit, a compensation circuit, a light-emitting control circuit and a light-emitting element. At least two sub-pixels can share the same light-emitting control circuit. The light-emitting drive circuit is connected to the light-emitting element, the compensation circuit is connected to the light-emitting drive circuit, the light-emitting control circuit is connected to the light-emitting drive circuit, the first drive circuit is connected to the light-emitting drive circuit, and the second drive circuit is connected to the light-emitting control circuit.