Dual Sampling Circuits for LCD Analog Data Voltage Control
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in securing sufficient sampling time and data driving time, particularly in analog sampling methods where the available time for data sampling and voltage supply to liquid crystal cells is too short.
Innovation Solution
An analog sampling apparatus with dual sampling and holding circuits that alternately sample and supply analog data voltage to the liquid crystal display panel, compensating for offset voltages to ensure stable voltage control and extended sampling time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a single sampling and holding circuit is used in the data driver, then the circuit complexity is reduced, but the sampling time and data driving time are insufficient
Solution Approach 1:
The data driver is divided into multiple independent sampling and holding circuits (first sampling and holding circuit, second sampling and holding circuit, etc.). Each circuit operates independently to sample and hold data at different time intervals, thereby extending the overall sampling time and ensuring sufficient data driving time without requiring a single complex circuit
2Duration of action of moving object
If multiple sampling and holding circuits are used to extend sampling time, then the sampling time is sufficient, but the circuit complexity increases
Solution Approach 1:
Multiple sampling and holding circuits operate in a periodic manner, where each circuit is activated at specific time intervals. The first sampling and holding circuit operates during one period, then the second circuit takes over in the next period, creating a cyclic operation pattern that extends the effective data driving time while managing circuit complexity through structured periodic activation
3Duration of action of moving object
If the sampling time is extended using multiple circuits, then sufficient data driving time is achieved, but the offset voltage compensation becomes more difficult
Solution Approach 1:
Each sampling and holding circuit incorporates offset voltage compensation mechanisms that use feedback from the data output bus line. The circuits monitor the offset voltages generated during sampling and holding operations, and automatically adjust their output to compensate for these offsets, ensuring precise voltage control is maintained even as sampling time is extended through multiple circuits
Data Source
AI summary
An analog sampling apparatus for a liquid crystal display device includes: a data driver to generate an analog data voltage; a data output bus line to receive the analog data voltage; a first sampling and holding circuit connected to the data output bus line to compensate an offset voltage in the analog data voltage and to supply the analog data voltage to a data line of a liquid crystal display panel; and a second sampling and holding circuit connected to the data output bus line arranged to sample the analog data voltage while the analog data voltage is supplied to the data line by the first sampling and holding circuit. The first sampling and holding circuit is arranged to supply the analog data voltage while the second sampling and holding circuit samples the analog data voltage, and to sample the analog data voltage while the second sampling and holding circuit supplies the analog data voltage.