Display Data Driver Buffer With Voltage Stabilizer for Offset Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional data drivers experience output offset due to instability in input voltage, leading to linearity deterioration and parasitic capacitance effects in unit gain buffers.
Innovation Solution
Incorporation of a voltage stabilizer, comprising a capacitor or source follower, between the switch and unit gain buffer in the output buffer circuit to stabilize the input voltage and minimize channel charge and parasitic capacitance influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a switch is used to selectively transmit gray voltages in the output buffer, then the data driver can sequentially output different gray voltages, but channel charge and parasitic capacitance cause input voltage instability and output offset
Solution Approach 1:
A voltage stabilizer circuit is introduced as an intermediary component between the switch and the unit gain buffer. This stabilizer includes a capacitor connected to the input terminal of the unit gain buffer, acting as a mediator to filter out voltage fluctuations caused by channel charge and parasitic capacitance, thereby stabilizing the input voltage without affecting the gray voltage selection capability
Solution Approach 2:
The voltage stabilizer performs preliminary action by pre-stabilizing the input voltage before it reaches the unit gain buffer. The capacitor in the stabilizer circuit charges or discharges in advance to compensate for voltage drops or spikes caused by switch operation, ensuring stable input voltage conditions before the signal is processed further
2Reliability
If the input voltage to the unit gain buffer is unstable, then the output offset increases and linearity deteriorates, but adding stabilization components increases device complexity
Solution Approach 1:
The voltage stabilizer is applied locally only at the input terminal of the unit gain buffer where voltage stabilization is most critical, rather than throughout the entire buffer circuit. This localized approach uses a simple capacitor connected to the input terminal, providing effective voltage stabilization while minimizing the increase in overall device complexity
Solution Approach 2:
The invention changes the electrical parameters of the stabilizer circuit, specifically selecting optimal capacitance values for the capacitor in the voltage stabilizer. By adjusting this parameter, the circuit achieves effective voltage stabilization and output offset reduction without requiring complex active components or multiple stabilization stages
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 voltage stabilizer significantly reduces output offset and maintains linearity, as demonstrated by simulations showing a decrease in bit error rates with optimal capacitance values and reduced parasitic capacitance effects.
Implementation Method 1
The voltage stabilizer may include a capacitor connected between the output terminal of the switch and ground
Implementation Method 2
The voltage stabilizer may include a source follower connected between the output terminal of the switch and the input terminal of the unit gain buffer
Data Source
AI summary
A data driver includes a digital to analog converter configured to receive a reference gray voltage and image data, and configured to generate gray voltages corresponding to the image data, and an output buffer including a plurality of buffer circuits connected to an output terminal of the digital to analog converter, and configured to selectively receive one of the gray voltages.