Sub-pixel Circuit Driving Transistors for Display Resolution
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Solution Overview
Problem
Traditional PWM driving methods for passive matrix panels face limitations in improving resolution due to high driving load and signal switching delays, hindering the development of high-resolution displays.
Innovation Solution
The implementation of a sub-pixel circuit with driving transistors coupled with electroluminescence devices in an active matrix panel architecture, where the load on scan and signal lines is reduced by splitting multiple signal lines within a sub-pixel, allowing for improved signal switching and increased gray levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If PWM driving is applied to PM panel with direct connection, then manufacturing cost and drive design difficulty are reduced, but signal switching delay increases and resolution cannot be greatly improved
Solution Approach 1:
The patent introduces a driving transistor as an intermediary component between the circuit line and the EL device. This transistor acts as a mediator that controls the current flow to the EL device, enabling PWM driving in AM panel architecture while reducing the direct load on circuit lines and improving signal switching speed.
Solution Approach 2:
The patent segments the direct connection between circuit lines and EL devices by inserting driving transistors. This segmentation allows the circuit lines to control multiple EL devices through transistor gates, reducing the load on each line and enabling faster signal switching while maintaining manufacturing simplicity.
2Illumination intensity
If large current flows directly into the chip, then the chip emits light, but the waveform rises slower than ideal and signal switching delay occurs
Solution Approach 1:
The driving transistor serves as an intermediary that controls current flow to the EL device. By using the transistor's gate control mechanism, the system can rapidly switch current on and off, achieving fast waveform rise times while still delivering sufficient current to maintain luminous brightness.
Solution Approach 2:
The patent employs dynamic control of current flow through PWM modulation of the transistor gate signal. This dynamic switching allows the system to deliver high current when needed for brightness while maintaining fast response times through controlled switching, rather than relying on continuous direct current flow.
3Manufacturing precision
If multiple signal lines are split in sub-pixel, then resolution is greatly improved, but device complexity increases
Solution Approach 1:
The patent segments each sub-pixel into multiple independently controllable EL devices, each with its own driving transistor. This segmentation enables higher resolution by allowing independent control of multiple sub-pixels within a single pixel location, while the AM panel architecture provides a systematic framework for managing the increased complexity.
Solution Approach 2:
The patent uses universal driving transistor circuits that can control multiple EL devices through shared gate lines. This multi-functionality allows the same transistor design to control different sub-pixels (RGB) and multiple gray levels, reducing the overall complexity despite the increased number of controllable elements.
Data Source
AI summary
A sub-pixel circuit, and an active electroluminescence display and a driving method thereof are provided. The sub-pixel circuit includes at least one electroluminescence device, and at least one first driving transistor or at least one second driving transistor and at least one third driving transistor coupled with the at least one electroluminescence device. A cathode of the electroluminescence device is coupled with a power source, an anode of the electroluminescence device is coupled with an output terminal of the first driving transistor, an input terminal of the first driving transistor is coupled with a signal line, and a control terminal of the first driving transistor is coupled with a scan line. Alternatively, the anode of the electroluminescence device is coupled with an output terminal of the second driving transistor, an input terminal of the second driving transistor is coupled with an output terminal of the third driving transistor.