Display Driver Circuit Charge Redistribution Settling
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Solution Overview
Problem
In high-resolution 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 prolonged settling times in voltage driving methods.
Innovation Solution
A driver circuit is designed with a voltage driving circuit, a D/A conversion circuit, and an auxiliary capacitor circuit that facilitates quick settling of input voltages by charge redistribution between auxiliary capacitors and parasitic capacitance, allowing for high-speed and accurate data voltage output through a combination of capacitive and voltage driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If capacitor charge redistribution driving is used to achieve high-speed pixel driving, then pixel writing speed is improved, but data voltage accuracy deteriorates
Solution Approach 1:
The pixel driving process is divided into two distinct phases: first, capacitive driving is used to rapidly write initial data voltage to the pixel; second, voltage driving is used to refine and accurately set the data voltage. This segmentation allows each method to be used for its strengths - speed for capacitive driving and accuracy for voltage driving - thereby resolving the contradiction between writing speed and voltage accuracy.
2Manufacturing precision
If voltage driving with amplifier circuit is used to achieve accurate data voltage output, then data voltage accuracy is improved, but settling time increases
Solution Approach 1:
Capacitive driving is performed as a preliminary action before voltage driving. The capacitive driving quickly establishes an initial data voltage close to the target value, reducing the voltage difference that the amplifier circuit must correct. This preliminary action significantly shortens the settling time required for the amplifier circuit to achieve accurate voltage output.
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
The solution enables rapid settling of output voltages in the amplifier circuit, achieving high-speed and accurate data voltage writing within the pixel writing time, improving the accuracy and efficiency of data voltage output in display devices.
Implementation Method 1
an auxiliary capacitor circuit having first to nth auxiliary capacitors provided between the input node of the voltage driving circuit and the first to nth auxiliary capacitor driving nodes... charge redistribution occurs between the first to nth auxiliary capacitors and a parasitic capacitance of the input node
Data Source
AI summary
A display device having a driver that drives load lines in an electro-optical panel through capacitor charge redistribution is provided with a first driving capacitance circuit that drives the load lines, and a second driving capacitance circuit that drives output of a D/A conversion circuit for outputting a voltage corresponding to a driving voltage. Settling time of the output of the D/A conversion circuit is shortened by controlling the second driving capacitance circuit to set the output of the D/A conversion circuit to a desired output voltage.