Driver Circuit Auxiliary Voltage Setting for Display Panel
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Solution Overview
Problem
In display devices, the shortening of pixel driving time poses challenges for amplifier circuits to write data voltages within the required time, leading to inaccuracies in capacitive driving methods, and voltage driving methods face delays in settling times, making it difficult to achieve high-accurate data voltage writing within the pixel writing time.
Innovation Solution
A driver configuration that includes a capacitor driving circuit, a voltage driving circuit, and an auxiliary voltage setting circuit, where the auxiliary voltage setting circuit sets the input node of the voltage driving circuit to the voltage of the data voltage output terminal before starting voltage driving, allowing rapid settling and disconnection of the switching circuit to prevent short-circuits, enabling high-speed capacitive driving and accurate data voltage output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If voltage driving is used to achieve high-accurate data voltage output, then data voltage accuracy is improved, but settling time increases making it difficult to write within pixel writing time
Solution Approach 1:
The auxiliary voltage setting circuit pre-charges the input node of the voltage driving circuit to a voltage close to the target data voltage before the voltage driving is activated. This preliminary action reduces the voltage difference that the amplifier circuit needs to settle, thereby significantly shortening the settling time while maintaining high data voltage accuracy.
Solution Approach 2:
The auxiliary voltage setting circuit acts as an intermediary between the capacitor driving circuit and the voltage driving circuit. It prepares the input node voltage in advance based on the capacitor driving output, creating optimal initial conditions for the voltage driving circuit to quickly achieve accurate data voltage output within the constrained pixel writing time.
2Manufacturing precision
If switching circuit is kept connected to maintain voltage driving continuity, then voltage driving accuracy is improved, but short-circuit risk increases
Solution Approach 1:
The switching circuit operates periodically - being turned on before voltage driving to establish the connection for accurate voltage output, and turned off after voltage driving to prevent short-circuits. This periodic on-off operation ensures both voltage driving accuracy during the on-period and circuit safety during the off-period.
Solution Approach 2:
The switching circuit is turned on in advance before the voltage driving is activated, ensuring the connection is established beforehand for accurate voltage output. After the voltage driving completes, the switching circuit is turned off to prevent short-circuit conditions, thus managing both accuracy and safety through timing control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration significantly shortens the settling time of the amplifier circuit output, allowing for accurate and rapid writing of data voltages, even within the constrained pixel writing time, by utilizing capacitive driving and voltage driving in conjunction with an auxiliary voltage setting circuit.
Implementation Method 1
a capacitor circuit having first to nth capacitors provided between the first to nth capacitor driving nodes and a data voltage output terminal
Implementation Method 2
an auxiliary voltage setting circuit that sets an input node of the voltage driving circuit to a voltage corresponding to a voltage of the data voltage output terminal before start of the voltage driving
Data Source
AI summary
In a display device having a driver that drives load lines in an electro-optical panel through capacitor charge redistribution, the driver, which drives load lines at a desired voltage through charge redistribution and furthermore drives these load lines at the desired voltage in a voltage driving circuit, includes an auxiliary voltage setting circuit that sets the voltage of an input terminal of the voltage driving circuit to a voltage corresponding to a driving voltage.