Level Shifter Single Input Terminal Reduces Power
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Solution Overview
Problem
Conventional level shifters in active matrix LCDs require dual input terminals, leading to increased power consumption and size due to the number of input pads, which is inefficient for electronic devices.
Innovation Solution
A level shifter design utilizing a configuration of transistors and an inverter with a single input terminal, where the first transistor receives a driving voltage and an input signal, and subsequent transistors and the inverter work together to invert and output a signal with a higher level, reducing power consumption and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If a conventional level shifter with dual input terminals is used, then the signal level can be elevated from 3.3V to 5V, but the number of input pads and device size increases, leading to increased power consumption
Solution Approach 1:
The patent extracts and eliminates one of the two input terminals from the conventional level shifter structure. By removing the redundant input terminal while maintaining the core level shifting functionality through a reconfigured transistor circuit, the device achieves the same voltage level conversion (3.3V to 5V) with fewer input pads, thereby reducing power consumption and device complexity
Solution Approach 2:
The single input terminal in the patent serves multiple functions that were previously distributed across two terminals. The input signal received at the single terminal is processed through the transistor network to simultaneously control multiple internal nodes, achieving both level shifting and signal distribution functions with a unified input interface
2Use of energy by stationary object
If a conventional level shifter with dual input terminals is used, then the signal level can be elevated from 3.3V to 5V, but the device size increases due to additional input pads
Solution Approach 1:
The patent extracts and eliminates one of the two input terminals from the conventional level shifter structure. By removing the redundant input terminal while maintaining the core level shifting functionality through a reconfigured transistor circuit, the device achieves the same voltage level conversion (3.3V to 5V) with fewer input pads, thereby reducing power consumption and device complexity
Solution Approach 2:
The patent merges the functions of multiple input terminals into a single input terminal. By combining the signal reception and control functions into one unified input interface, the device reduces the total area required for input pads while maintaining full level shifting capability, thus reducing overall device size
Data Source
AI summary
A level shifter and a display device having the same are provided. In a level shifter, a first transistor includes a gate electrode receiving a first driving voltage, and a source electrode receiving an input signal through an input terminal. A second transistor includes a drain electrode receiving the first driving voltage, and a source electrode electrically connected to a drain electrode of the first transistor through a first node. A third transistor includes a source electrode receiving a second driving voltage, a drain electrode electrically connected to a gate electrode of the second transistor through a second node, and a gate electrode receiving the input signal. A fourth transistor includes a drain electrode receiving the first driving voltage, a gate electrode electrically connected to the drain electrode of the first transistor through the first node, and a source electrode electrically connected to the drain electrode of the third transistor through the second node. An inverter inverts a signal outputted from the second node to apply the inverted signal to an output terminal.