Multiplexing Driving Method for Display Devices
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Solution Overview
Problem
Existing multiplexing driving methods in display technology face challenges such as unstable voltage recording in pixel storage capacitors, slow charging speed due to high TFT resistance, and high power consumption, leading to chromatic aberration and low source driver utilization.
Innovation Solution
A multiplexing driving method that includes an initial time period for pre-charging, a first charging time period for writing grey-scale voltage into data lines, and a second charging time period for writing grey-scale voltage into pixel circuits, utilizing pre-charging and non-pre-charging multiplexing switches to improve voltage stability and charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the source driver is multiplexed to a large extent with grey-scale voltage applied to multiple data lines via one multiplexing sub-circuit in time-division manner, then the source driver utilization rate improves, but the charging speed becomes slow and charging rate decreases due to large TFT resistance
Solution Approach 1:
The patent divides the data line charging process into two distinct phases: a first charging time period for charging parasitic capacitance of data lines when the gate line is off, and a second charging time period for charging pixel storage capacitors when the gate line is on. This segmentation allows optimized control of multiplexing switches for each phase, improving overall charging efficiency while maintaining high source driver utilization.
Solution Approach 2:
The patent performs preliminary charging of the parasitic capacitance of data lines in the first charging time period before the gate line is turned on. This preliminary action ensures that when the gate line is activated in the second charging time period, the voltage is already stable and ready for efficient pixel circuit charging, thereby improving charging speed without sacrificing source driver utilization.
2Reliability
If all multiplexing switches in a multiplexing sub-circuit are controlled to be turned on and initial voltage is written into all data lines, then charging coverage is improved, but power consumption increases due to repeated charging and discharging processes
Solution Approach 1:
The patent applies different control strategies to different multiplexing switches based on their specific needs. Pre-charging multiplexing switches are controlled separately from non-pre-charging multiplexing switches, allowing optimized power consumption for each group while ensuring complete charging coverage across all data lines and pixel circuits.
Solution Approach 2:
The patent implements periodic charging actions with distinct phases: the first charging time period charges parasitic capacitance when the gate line is off, and the second charging time period charges pixel storage capacitors when the gate line is on. This periodic structure eliminates unnecessary repeated charging and discharging, reducing power consumption while maintaining reliable charging coverage.
3Device complexity
If voltage is written into data lines when gate line is turned off and then grey-scale voltage is written into pixel circuits when gate line is turned on, then charging sequence is simplified, but chromatic aberration occurs due to unstable voltage from source driver
Solution Approach 1:
The patent performs preliminary stabilization of the voltage from the source driver by charging the parasitic capacitance of data lines in the first charging time period before the gate line is turned on. This preliminary action ensures that when grey-scale voltage is subsequently written into pixel circuits in the second charging time period, the voltage is already stable, preventing chromatic aberration while maintaining a relatively simple charging sequence.
Solution Approach 2:
The patent uses the parasitic capacitance of data lines as a buffer or cushion before the actual pixel charging process. By charging this parasitic capacitance first when the gate line is off, the system prepares a stable voltage foundation that cushions against voltage instability from the source driver, thereby preventing chromatic aberration in the subsequent pixel charging phase.
Data Source
AI summary
A multiplexing driving method includes: within an initial time period, applying, by a source driver, an initial voltage to a pre-charging multiplexing switch; within a first charging time period, controlling different non-pre-charging multiplexing switches to be turned on in a time-division manner, so as to write a corresponding grey-scale voltage into corresponding non-pre-charging data lines in a time-division manner via the turned-on non-pre-charging multiplexing switches; and within a second charging time period, controlling, by the gate driving circuit, a corresponding gate line to be turned on; controlling different pre-charging multiplexing switches to be turned on in a time-division manner; and applying, by the source driver, a corresponding grey-scale voltage to the pre-charging multiplexing switches to write the corresponding grey-scale voltage to pixel circuits in a row corresponding to the gate line and electrically connected to the corresponding pre-charging data lines respectively in a time-division manner.