OLED Display Subpixel Circuit Layout for Hysteresis and Flicker
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Rigid liquid crystal displays (LCDs) fail to meet consumer demands for flexibility and image quality, and existing OLED displays suffer from issues like hysteresis and frequency switching flicker in sub-pixel driving circuits.
Innovation Solution
A display substrate design with a specific layout of signal lines and transistors, including independent control of power and light emitting control signal lines, and a structured sub-pixel driving circuit to improve hysteresis and flicker issues, utilizing low-temperature polysilicon transistors and a capacitor structure for stable signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sub-pixel driving circuit uses conventional transistor arrangement, then the circuit can be simplified, but hysteresis and frequency switching flicker occur due to inconsistent potential environments
Solution Approach 1:
The patent divides the transistor control into separate modules: a power control transistor for power supply management and a light emitting control transistor for light emission control. This segmentation allows each transistor to independently control its potential environment, eliminating hysteresis and flicker while maintaining circuit functionality.
Solution Approach 2:
The patent applies different control mechanisms to different parts of the driving circuit. The power control transistor creates a stable potential environment for power supply, while the light emitting control transistor manages the light emitting element's potential. This localized control ensures consistent potential environments without requiring complete circuit redesign.
2Manufacturing precision
If light emitting control signal lines are arranged to extend along the first direction with orthogonal projections along the second direction, then signal transmission is optimized, but layout complexity increases
Solution Approach 1:
The patent transitions from traditional single-direction signal line arrangement to a two-dimensional orthogonal projection arrangement. The signal lines extend along the first direction while their orthogonal projections are distributed along the second direction, creating a grid-like pattern that optimizes signal transmission without excessive layout complexity.
Solution Approach 2:
The signal line system is segmented into multiple independent lines (first light emitting control signal line and second light emitting control signal line), each extending along the first direction but positioned differently along the second direction. This segmentation allows for precise control of signal transmission while maintaining manageable layout complexity.
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A display substrate and a display device are provided. The display substrate includes a first light emitting control signal line, a second light emitting control signal line and a plurality of sub-pixels; the sub-pixel includes a sub-pixel driving circuit and a light emitting element, the sub-pixel driving circuit includes a driving transistor, a power control transistor and a light emitting control transistor; a gate electrode of the power control transistor is coupled to a corresponding first light emitting control signal line, a first electrode of the power control transistor is coupled to a corresponding power line, and a second electrode of the power control transistor is coupled to a first electrode of the driving transistor, a gate electrode of the light emitting control transistor is coupled to a corresponding second light emitting control signal line, and a first electrode of the light emitting control transistor is connected to a second electrode of the driving transistor, and a second electrode of the light emitting control transistor is coupled to the light emitting element; an orthographic projection of the first light emitting control signal line on the base substrate and an orthographic projection of the second light emitting control signal line on the base substrate are arranged along a second direction.