Pixel Circuit Shunt Pre-Charging for High-Resolution Displays
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Solution Overview
Problem
Conventional pixel circuits struggle to effectively write high-voltage data signals in high-resolution display devices due to shortened data writing phases, leading to abnormal driving current output and light emission issues.
Innovation Solution
A pixel circuit design incorporating a shunt circuit that controls the connection/disconnection of signal terminals in response to control signals, allowing for pre-charging of the driving control node in the to-be-charged pixel circuit, ensuring complete writing of data signals even during short data writing phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resolution is increased to achieve high definition display, then display quality is improved, but data writing time is shortened causing incomplete data signal writing
Solution Approach 1:
The patent applies preliminary action by introducing a pre-charging phase before the normal data writing phase. During this pre-charging phase, a pre-charging signal is written to the pixel circuit in advance, preparing the capacitor and transistor states for subsequent high-voltage data signal writing. This preliminary preparation ensures that when the actual data writing occurs during the shortened time window, the pixel circuit is already in an optimal state to complete the writing of high-voltage signals without abnormal light emission.
2Productivity
If data writing phase duration is reduced due to constant frame period, then frame rate is maintained, but high-voltage data signals cannot be completely written
Solution Approach 1:
The patent uses preliminary action by implementing a pre-charging control node that prepares the pixel circuit state before actual data writing. The pre-charging signal is written in advance during a dedicated pre-charging phase, ensuring that when the shortened data writing phase occurs, the pixel circuit components (capacitor and transistor) are already in the correct initial state to reliably complete high-voltage signal writing within the limited time available.
Solution Approach 2:
The patent applies segmentation by dividing the data writing process into two distinct phases: a pre-charging phase and a normal data writing phase. The pre-charging phase separately handles the initialization of pixel circuit components, while the normal data writing phase focuses on writing the actual display data. This segmentation allows each phase to be optimized independently, ensuring reliable high-voltage signal writing during the constrained time window without compromising frame rate.
3Device complexity
If conventional pixel circuit is used in high resolution displays, then device complexity is kept low, but abnormal light emission occurs due to incomplete data writing
Solution Approach 1:
The patent applies segmentation by introducing a shunt circuit that separates the pre-charging function from the normal data writing function. This additional circuit component divides the writing process into distinct operational phases, allowing the pixel circuit to reliably handle high-voltage data signals during the shortened writing time without causing abnormal light emission, while maintaining overall circuit simplicity through modular design.
Solution Approach 2:
The patent uses an intermediary approach by introducing a pre-charging control node as a mediator between the data line and the pixel circuit's storage capacitor. This intermediary component prepares the capacitor voltage in advance before the actual data writing occurs, ensuring that high-voltage signals are written correctly during the shortened time window without causing display abnormalities, thus improving reliability without significantly increasing overall circuit complexity.
Data Source
AI summary
The present disclosure provides a pixel circuit, including: a pixel driving circuit coupled to a gate line and a data line and configured to generate a driving current based on a data signal provided by the data line in response to a gate driving signal provided by the gate line and output the driving current through a current output terminal; and a shunt circuit coupled to the gate line and a first control signal line, and configured to control connection/disconnection between a first signal input terminal and a first signal output terminal in response to the gate driving signal and a first control signal provided by the first control signal line. The current output terminal is coupled to a first terminal of a light emitting device and the first signal input terminal, and the first signal output terminal is coupled to a to-be-charged pixel circuit.