Inverted Pulse Output Circuit Through Current Reduction
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Solution Overview
Problem
Active matrix display devices with scan line driver circuits formed using either n-channel or p-channel transistors experience high power consumption due to significant through current when outputting inverted signals to scan lines.
Innovation Solution
The display device incorporates a plurality of pulse output circuits and inverted pulse output circuits, where the operation of the inverted pulse output circuits is controlled by signals used for the pulse output circuits, reducing through current by operating without generating additional signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a scan line driver circuit is formed using either n-channel transistors or p-channel transistors to simplify manufacturing, then the number of manufacturing steps is reduced, but power consumption increases due to significant through current when outputting inverted signals
Solution Approach 1:
The scan line driver circuit is divided into separate pulse output circuits (for non-inverted signals) and inverted pulse output circuits (for inverted signals). Each circuit operates independently with dedicated transistors, allowing the inverted pulse output circuit to remain in a high-impedance state during non-operational periods, thereby minimizing through current while maintaining manufacturing simplicity
Solution Approach 2:
The inverted pulse output circuit operates periodically rather than continuously, being activated only when inverted signals need to be output. During other periods, the circuit remains in a high-impedance state, significantly reducing through current and power consumption while maintaining the ability to output inverted signals when required
2Reliability
If additional control signals are generated for inverted pulse output circuits, then the operation of these circuits can be precisely controlled, but device complexity increases
Solution Approach 1:
The control signals for the inverted pulse output circuit are merged with the existing control signals used by the pulse output circuits. The same clock signals and control lines that drive the non-inverted output also control the inverted output, eliminating the need for separate additional control signals while maintaining precise operational control
Solution Approach 2:
The existing control signal infrastructure is made multi-functional, serving both the pulse output circuits and the inverted pulse output circuits. This universal control approach reduces the total number of control signals needed while ensuring reliable operation of both circuit types through the same control mechanism
Data Source
AI summary
A display device includes a plurality of pulse output circuits each of which outputs signals to one of the two kinds of scan lines and a plurality of inverted pulse output circuits each of which outputs, to the other of the two kinds of scan lines, inverted or substantially inverted signals of the signals output from the pulse output circuits. Each of the plurality of inverted pulse output circuits operates with at least two kinds of signals used for the operation of the plurality of pulse output circuits. Thus, through current generated in the inverted pulse output circuits can be reduced.