Sample Hold Circuit Voltage Stabilization for Liquid Crystal Displays

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Solution Overview

Problem

Existing sample/hold circuits for liquid crystal displays face challenges in efficiently sampling and stabilizing voltages in liquid crystal capacitors, particularly in larger display panels where weight and radiation concerns are critical.

Innovation Solution

A sample/hold circuit comprising a sampling transistor, a sampling capacitor, a first switching transistor, and a second switching transistor, coupled to a liquid crystal capacitor, which samples and stabilizes the voltage stored in the capacitor using specific transistor configurations and control signals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a conventional sample/hold circuit is used in liquid crystal displays, then the circuit can store voltage in the liquid crystal capacitor, but the voltage sampling and stabilization is inefficient

Engineering Contradiction:

Improvevoltage sampling efficiencyVSAvoidvoltage stabilization

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The sample/hold circuit is segmented into distinct functional components: a sampling transistor for voltage sampling, a sampling capacitor for storing the sampled voltage, and switching transistors for controlling the hold function. This segmentation allows each component to be optimized for its specific function, improving overall sampling efficiency and voltage stabilization reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The sampling capacitor acts as an intermediary element between the liquid crystal capacitor and the rest of the circuit. It temporarily stores the sampled voltage and provides a stable reference for the hold function, thereby improving both sampling efficiency and voltage stabilization without requiring direct connection between the liquid crystal capacitor and the hold circuit.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Area of stationary object

If larger display panels are used, then the display area increases, but the weight remains substantial

Engineering Contradiction:

Improvedisplay areaVSAvoidpanel weight

Core Design Contradiction:

Area of stationary objectVSWeight of stationary object

Solution Approach 1:

The invention changes the electrical parameters of the sample/hold circuit to optimize performance for larger display panels. By adjusting the sampling and holding mechanisms, the circuit can maintain efficient voltage storage with reduced power consumption, which indirectly reduces the overall system weight while maintaining large display area.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If conventional sample/hold circuits are used, then the circuit can function, but the voltage storage stability is insufficient

Engineering Contradiction:

Improvevoltage storage stabilityVSAvoidcircuit configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The sample/hold circuit is designed with multi-functional transistors that can operate in different modes. The switching transistors can function as both sampling switches and holding switches depending on the control signals, reducing the need for separate dedicated components and simplifying the overall circuit configuration while maintaining voltage storage stability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 effectively samples and stores data signals in liquid crystal capacitors, ensuring stable voltage storage and transmission, suitable for large display panels with minimal weight and radiation impact.

Implementation Method 1

The sampling transistor is coupled to the liquid crystal capacitor for sampling a voltage stored in the liquid crystal capacitor. The sampling capacitor stores the sampling result.

Methodology Applied

Scientific EffectCapacitance: Capacitance

Implementation Method 2

The first switching transistor comprises a gate and a source respectively coupled to two terminals of the sampling capacitor. The second switching transistor comprises a gate and a drain respectively coupled to the terminals of the sampling capacitor.

Methodology Applied

Scientific EffectField Effect Transistor operation: Conduction (electrical)

Data Source

PatentUS7952546B2Sample/hold circuit, electronic system, and control method utilizing the same

Publication Date: 2011.05.31 INNOLUX CORP

AI summary

A sample/hold circuit is appropriate for a pixel unit including a liquid crystal capacitor and includes a sampling transistor, a sampling capacitor, a first switching transistor, and a second switching transistor. The sampling transistor is coupled to the liquid crystal capacitor for sampling a voltage stored in the liquid crystal capacitor. The sampling capacitor stores the sampling result. The first switching transistor includes a gate and a source respectively coupled to two terminals of the sampling capacitor. The second switching transistor includes a gate and a drain respectively coupled to the terminals of the sampling capacitor.