Variable Capacitance Driver Circuit for Electro-Optical Panels
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Solution Overview
Problem
Capacitive driving methods for electro-optical panels face challenges in maintaining a consistent data voltage range due to variations in capacitance ratios during different operation states, leading to inconsistent display quality.
Innovation Solution
A driver circuit with a capacitor driving circuit, a variable capacitance circuit, and a control circuit that sets the variable capacitance to specific values in precharge and pixel driving periods, ensuring a constant capacitance ratio and thus stable data voltage across operation states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If capacitive driving is used to drive electro-optical panels, then power consumption is reduced and driving efficiency is improved, but the data voltage range varies among operation states due to capacitance ratio variations
Solution Approach 1:
The patent applies the Dynamics principle by making the capacitance of the capacitor circuit dynamically adjustable according to operation state. The control circuit changes the capacitance value based on whether the system is in precharge mode or pixel writing mode, thereby maintaining a consistent effective capacitance ratio and stable data voltage range across different operating conditions.
Solution Approach 2:
The patent implements Parameter changes by varying the capacitance parameter of the capacitor circuit based on operation state. The control circuit adjusts the capacitance value to compensate for changes in panel-side capacitance, ensuring that the ratio between driving-side and panel-side capacitances remains constant, thus stabilizing the data voltage output range.
2Device complexity
If a fixed capacitance circuit is used in capacitive driving, then the circuit structure is simple, but the data voltage range varies among operation states due to capacitance ratio variations
Solution Approach 1:
The patent transitions from a static fixed capacitance circuit to a dynamic adjustable capacitance circuit. The control circuit selectively connects different capacitance values based on operation state, enabling the system to adapt to varying panel-side capacitance conditions while maintaining stable data voltage output.
Solution Approach 2:
The patent implements a feedback mechanism where the control circuit monitors the operation state and adjusts the capacitance value accordingly. This closed-loop control ensures that the effective capacitance ratio remains constant despite changes in operation mode, thereby stabilizing the data voltage range.
3Adaptability or versatility
If the number of connected data lines varies between precharge and pixel writing, then demultiplex driving is achieved, but the capacitance ratio varies leading to data voltage range variation
Solution Approach 1:
The patent uses dynamic capacitance adjustment to compensate for the varying number of connected data lines during demultiplex driving. The control circuit modifies the driving-side capacitance based on whether all data lines are connected (precharge) or only one data line is connected (pixel writing), maintaining a constant effective capacitance ratio.
Solution Approach 2:
The patent changes the capacitance parameter of the driver circuit based on the number of active data lines. By adjusting the capacitance value in response to operation state, the system maintains a consistent capacitance ratio despite the varying electrical load from different numbers of connected data lines.
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 maintains a consistent capacitive driving amplitude and accurate precharge voltage, improving display quality by minimizing voltage variations and reducing power consumption in the amplifier circuit.
Implementation Method 1
a variable capacitance circuit connected to the output terminal, and a control circuit configured to set the variable capacitance circuit to a first capacitance value in a pixel driving period of an electro-optical panel and to set the variable capacitance circuit to a second capacitance value smaller than the first capacitance value in a precharge period of the electro-optical panel
Data Source
AI summary
A driver including a capacitor circuit, a capacitor driving circuit, a variable capacitance circuit, and a control circuit is provided. The capacitor circuit includes first to n-th capacitors provided between first to n-th capacitor driving nodes and an output terminal. The variable capacitance circuit is connected to the output terminal. The control circuit sets the variable capacitance circuit to the first capacitance value in a pixel driving period of the electro-optical panel, and sets the variable capacitance circuit to the second capacitance value smaller than the first capacitance value in a precharge period of the electro-optical panel.