Display Data Driver Buffer with Voltage Stabilizer for Offset Linearity
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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
Incorporating a voltage stabilizer, comprising a capacitor or source follower, between the switch and unit gain buffer in the data driver's output buffer to stabilize the input voltage and minimize channel charge and parasitic capacitance influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a voltage stabilizer is added to stabilize input voltage, then output offset is reduced and linearity is maintained, but device complexity increases
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 between the switch output and ground, and a source follower transistor that buffers the voltage. The intermediary stabilizer isolates the unit gain buffer from voltage fluctuations caused by switch operations, preventing output offset while adding minimal complexity to the overall system.
2Productivity
If the switch is turned on to transmit gray voltage, then signal transmission is enabled, but channel charge and parasitic capacitance cause voltage instability
Solution Approach 1:
The voltage stabilizer is configured to prepare and stabilize the input voltage before it reaches the unit gain buffer. The capacitor in the stabilizer charges in advance during the switch on-time, and the source follower maintains a stable voltage level. This preliminary stabilization action prevents voltage instability caused by channel charge and parasitic capacitance effects during signal transmission.
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 effectively reduces output offset and maintains linearity, as demonstrated by simulations showing a significant decrease in bit error rates with the use of a voltage stabilizer, particularly with optimal capacitance values.
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.