Display Panel Signal Line Multiplexing for High PPI
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Solution Overview
Problem
Existing display panels face challenges in optimizing pixel circuit performance while achieving high pixels per inch (PPI), particularly in high-resolution microLED or OLED displays, due to the complexity of combining pulse-amplitude modulation (PAM) and pulse-width modulation (PWM) for controlling light-emitting elements.
Innovation Solution
The implementation of a display panel with a pixel circuit that includes both amplitude modulation and pulse width modulation subcircuits, where at least one data signal line is used to transmit both data and bias adjustment signals, allowing for the adjustment of transistor bias states to optimize performance and reduce the number of signal lines required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate signal lines are used for data signals and bias adjustment signals, then signal transmission is simpler and more reliable, but the number of signal lines increases and device complexity increases
Solution Approach 1:
The patent merges the data signal line and bias adjustment signal line into a single shared signal line. The same physical line transmits both data signals during the data writing period and bias adjustment signals during the bias adjustment period, reducing the total number of signal lines while maintaining functional separation through time-division multiplexing
Solution Approach 2:
The patent employs periodic time-division multiplexing where the shared signal line alternates between transmitting data signals and bias adjustment signals in different time periods. During the data writing period, the line carries data signals; during the bias adjustment period, it carries bias adjustment signals, achieving reliable signal transmission through structured periodic operation
2Reliability
If more signal lines are used for PAM and PWM control, then pixel circuit performance can be optimized, but the number of signal lines increases which reduces PPI
Solution Approach 1:
The patent combines the data signal line and bias adjustment signal line into one shared line, reducing the total signal line count. This enables more pixel circuits to be packed into the same area, increasing PPI while still providing both data and bias adjustment functions needed for optimal PAM-PWM pixel circuit performance
Solution Approach 2:
The shared signal line performs multiple functions: it serves as both a data signal line during data writing and a bias adjustment signal line during bias adjustment. This multi-functionality reduces the number of dedicated lines needed, enabling higher PPI while maintaining the capability to optimize pixel circuit performance through both PAM and PWM control
Data Source
AI summary
Provided are a display panel, a driving method thereof, and a display device. The display panel includes a pixel circuit and a light-emitting element. The pixel circuit includes an amplitude modulation subcircuit and a pulse width modulation subcircuit. The amplitude modulation subcircuit is connected to a first data signal line. The pulse width modulation subcircuit is connected to a second data signal line. At least one of the first data signal line or the second data signal line is used to transmit a data signal and a bias adjustment signal.