Multi-Stage Scan Circuit for Consistent OLED Illumination
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Solution Overview
Problem
Existing OLED display technologies face challenges in efficiently controlling the driving current to maintain consistent illumination, particularly in high-resolution and low-resolution areas, leading to potential noise interference and inefficiencies in scan circuits.
Innovation Solution
A scan circuit with multiple stages of scan units, each comprising input, processing, and output subcircuits, is designed to receive and process clock and reference signals, ensuring synchronized control signals for main and auxiliary pixel driving circuits, reducing noise interference and maintaining consistent illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional scan circuit is used to control OLED display, then the display can show images, but noise interference occurs and illumination consistency deteriorates
Solution Approach 1:
The scan circuit is divided into multiple scan units, each independently controlling specific pixel rows. Each scan unit includes separate first and second scan signal generation circuits that independently generate scan signals for different pixel groups, reducing noise interference and improving illumination consistency through distributed control architecture
Solution Approach 2:
Capacitors are introduced as intermediary elements to store and stabilize voltages at critical nodes in the scan circuit. These capacitors act as mediators that filter noise and maintain stable voltage levels during signal transmission, thereby reducing noise interference and ensuring consistent illumination across the display
2Manufacturing precision
If the scan circuit controls all pixel rows uniformly, then the circuit structure remains simple, but display resolution and performance are compromised
Solution Approach 1:
The pixel display area is divided into multiple regions with different resolutions, and the scan circuit is segmented into corresponding scan units. Each scan unit independently controls its designated pixel rows with appropriate resolution characteristics, enabling high-resolution display in specific areas while maintaining manageable circuit complexity through modular architecture
Solution Approach 2:
Different scan units are designed with different levels of control precision and circuit complexity according to the specific resolution requirements of their respective display regions. High-resolution areas receive more sophisticated scan control while lower-resolution areas use simpler control circuits, optimizing overall performance without uniformly increasing complexity
3Reliability
If multiple scan signals are generated for different pixel rows, then illumination consistency improves, but circuit complexity increases
Solution Approach 1:
Multiple scan signal generation functions are merged into integrated scan units where first and second scan signal generation circuits share common control logic and resources. This merging approach enables independent control of different pixel rows for improved illumination consistency while reducing overall circuit complexity through functional integration and resource sharing
Data Source
AI summary
A display apparatus includes a light emitting substrate; a plurality of scan units in a plurality of stages, respectively, wherein a respective scan circuit of the plurality of scan units includes a first output terminal and a second output terminal in a respective stage; a plurality of subpixels. A respective subpixel of the plurality of subpixels includes a first light emitting element; a first pixel driving circuit configured to control light emission in the first light emitting element; a second light emitting element; and a second pixel driving circuit configured to control light emission in the second light emitting element. The first light emitting element and the second light emitting element are configured to emit a light of a same color. The first pixel driving circuit is connected to the first output terminal. The second pixel driving circuit is connected to the first output terminal.