Pixel Circuit Reset Layout for High-PPI Display Panels
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Solution Overview
Problem
Existing pixel circuits in display devices have complex structures that hinder achieving high pixels per inch (PPI) due to the involvement of numerous signals and circuit complexity.
Innovation Solution
A simplified pixel circuit structure is implemented, incorporating a voltage control circuit, current control circuit, and light-emitting circuit, with a first driving circuit connected between a power line and a control terminal, and a reset circuit to manage voltage levels and reset functions, allowing for reduced signal lines and flexible power voltage settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a complex pixel circuit structure with many signal types is used, then the display device can achieve certain display functions, but the circuit structure becomes complex and PPI cannot be increased
Solution Approach 1:
The patent combines multiple signal types into a unified signal transmission mechanism. The pixel circuit uses a simplified structure where a single signal line carries both data and control information, merging what were previously separate signal paths into one integrated transmission channel, thereby reducing overall circuit complexity while maintaining display functionality
Solution Approach 2:
The pixel circuit employs a universal control mechanism where the same circuit components serve multiple functions. The driving circuit acts as both a data transmission device and a control device, while the pixel circuit structure itself performs both signal reception and voltage regulation functions, eliminating the need for separate dedicated circuits for each function
2Reliability
If more signal lines are used to achieve high display performance, then the display quality improves, but the layout space increases and PPI is reduced
Solution Approach 1:
Multiple signal lines are merged into a single transmission line that carries both data and control signals. The patent implements a shared signal path where data voltage and control signals are transmitted through the same physical line, effectively halving the number of required signal lines and reducing layout space requirements
Solution Approach 2:
The patent transitions from a planar signal transmission approach to a time-multiplexed approach. Instead of using multiple simultaneous signal lines, the system uses a single signal line that transmits different signals at different time intervals, adding a temporal dimension to the signal transmission and thereby reducing spatial requirements
3Device complexity
If the pixel circuit structure is simplified, then PPI increases and layout space is saved, but voltage differences and bias voltages may increase reducing reliability
Solution Approach 1:
The pixel circuit incorporates a feedback mechanism where the driving circuit continuously monitors the voltage level and adjusts its operation accordingly. The circuit uses the voltage information from the signal line to dynamically adjust the driving current, ensuring stable voltage levels despite the simplified structure, thereby maintaining reliability while reducing complexity
Data Source
AI summary
A pixel circuit, a driving method therefor and a display device. The pixel circuit includes a voltage control circuit, a current control circuit and a light-emitting circuit. The voltage control circuit includes a first driving circuit, a coupling circuit and a first voltage write circuit. The coupling circuit is configured to couple a reset signal to a control terminal of the first driving circuit to reset a voltage of a control terminal of the current control circuit; or the voltage control circuit further includes a reset circuit, where the reset circuit is connected between a first power line and a control terminal of the current control circuit and configured to reset a voltage of the control terminal of the current control circuit.