Electro-optical Device Logical Operation Circuits Timing Adjustment
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Solution Overview
Problem
In electro-optical devices with increased data lines for higher definition, the demultiplexer system faces challenges in maintaining selection period efficiency and monitoring output signals from inspection circuits due to narrowed switch OFF periods.
Innovation Solution
The electro-optical device incorporates a first and second switch controlled by distinct signals, a sequential output circuit, and logical operation circuits to generate logical product and sum signals, facilitating signal distinction and improved timing adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of data lines is increased to satisfy higher definition demand, then the definition quality is improved, but the selection period per data line is reduced
Solution Approach 1:
The patent segments the data lines into multiple groups, with each group handled by a dedicated demultiplexer. This allows parallel processing of multiple data lines simultaneously, increasing the effective selection period for each group while maintaining support for a larger total number of data lines required for higher definition displays.
Solution Approach 2:
The patent introduces a group dimension in addition to the individual data line dimension. By organizing data lines into groups and using multiple demultiplexers, the system adds a hierarchical structure that allows more data lines to be managed without proportionally reducing the selection period for each group.
2Productivity
If the period between switch ON periods is narrowed to maintain selection period efficiency, then the selection period efficiency is improved, but the ability to monitor output signals from inspection circuit is degraded
Solution Approach 1:
The patent introduces an inspection circuit as an intermediary component that includes buffer circuits and level shifters. These intermediary elements are strategically placed to allow signal monitoring during the narrow OFF periods, acting as a bridge between the high-speed switching operation and the inspection requirements.
Solution Approach 2:
The inspection circuit performs preliminary signal buffering and level shifting in advance, preparing signals for monitoring before the actual switching occurs. This preliminary action ensures that signals can be captured and analyzed even during the brief intervals when switches are OFF.
Data Source
AI summary
An electro-optical device includes a first switch provided between an input node supplied with a data signal and a first data line, the first switch being configured to be turned ON or OFF by a first control signal, a second switch provided between the input node and a second data line, the second switch being configured to be turned ON or OFF by the second control signal, a sequential output circuit configured to output a first pulse, and a second pulse exclusive of the first pulse, logical operational first logical operation circuit configured to acquire a first logical product signal of the first control signal and the first pulse, and a second logical product signal of the second control signal and the second pulse, and a second logical operation circuit configured to generate a logical sum signal of the first logical product signal and the second logical product signal.