Signal Line Driver Circuit Potential Stability
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Solution Overview
Problem
Conventional signal line driver circuits in liquid crystal display devices are prone to malfunctions due to changes in potential caused by leakage current in field-effect transistors, affecting the desired operation of the circuit.
Innovation Solution
A signal line driver circuit is designed with a latch unit, buffer unit, and switch unit that controls data rewriting, using control signals to suppress changes in potential, and includes a selection circuit and driving signal output circuit to manage pulse signals and control the potential of signal lines, thereby preventing malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional signal line driver circuit is used, then the circuit can output driving signals, but leakage current causes potential changes that lead to malfunctions
Solution Approach 1:
The circuit performs preliminary actions by periodically rewriting data in the latch unit before leakage current can cause harmful potential changes. The switch unit is controlled to rewrite data at specific timing intervals, proactively preventing the accumulation of leakage current effects that would otherwise lead to malfunctions.
Solution Approach 2:
The invention implements periodic action by continuously rewriting data in the latch unit at predetermined time intervals using the switch unit. This periodic rewriting operation counteracts the continuous leakage current by refreshingly updating the stored data before it degrades, ensuring stable potential levels and preventing malfunctions.
2Stability of the object's composition
If data is continuously rewritten in the latch unit, then potential stability is improved, but circuit complexity increases
Solution Approach 1:
The invention extracts the data rewriting function into a separate switch unit that operates independently from the main signal output path. This modular approach allows the latch unit to maintain stable data while the switch unit handles periodic rewriting operations, reducing the complexity burden on the core signaling circuitry.
Solution Approach 2:
The switch unit acts as an intermediary between the latch unit and the external control signals. It mediates the periodic rewriting operation by selectively connecting the latch unit to rewrite signals at appropriate timing intervals, thereby achieving data stability without requiring the entire circuit to be continuously active or complex.
Data Source
AI summary
To prevent malfunctions from occurring. A shift register, a selection circuit having a function of determining which a first pulse signal or a second pulse signal is output at the same potential level as a pulse signal input from the shift register, and a plurality of driving signal output circuits each having functions of generating and outputting a driving signal are provided. Each of the plurality of driving signal output circuits includes a latch unit, a buffer unit, and a switch unit for controlling rewriting of data stored in the latch unit.